diff --git a/compiler/rustc_ast_lowering/messages.ftl b/compiler/rustc_ast_lowering/messages.ftl
index e0dc227ca4c01..37e45379ba9a2 100644
--- a/compiler/rustc_ast_lowering/messages.ftl
+++ b/compiler/rustc_ast_lowering/messages.ftl
@@ -123,9 +123,6 @@ ast_lowering_never_pattern_with_guard =
     a guard on a never pattern will never be run
     .suggestion = remove this guard
 
-ast_lowering_not_supported_for_lifetime_binder_async_closure =
-    `for<...>` binders on `async` closures are not currently supported
-
 ast_lowering_previously_used_here = previously used here
 
 ast_lowering_register1 = register `{$reg1_name}`
diff --git a/compiler/rustc_ast_lowering/src/errors.rs b/compiler/rustc_ast_lowering/src/errors.rs
index 7658dfa5d5f63..ec92afee47a6b 100644
--- a/compiler/rustc_ast_lowering/src/errors.rs
+++ b/compiler/rustc_ast_lowering/src/errors.rs
@@ -326,13 +326,6 @@ pub struct MisplacedRelaxTraitBound {
     pub span: Span,
 }
 
-#[derive(Diagnostic, Clone, Copy)]
-#[diag(ast_lowering_not_supported_for_lifetime_binder_async_closure)]
-pub struct NotSupportedForLifetimeBinderAsyncClosure {
-    #[primary_span]
-    pub span: Span,
-}
-
 #[derive(Diagnostic)]
 #[diag(ast_lowering_match_arm_with_no_body)]
 pub struct MatchArmWithNoBody {
diff --git a/compiler/rustc_ast_lowering/src/expr.rs b/compiler/rustc_ast_lowering/src/expr.rs
index 3b00a84e67e9f..c4798887637f8 100644
--- a/compiler/rustc_ast_lowering/src/expr.rs
+++ b/compiler/rustc_ast_lowering/src/expr.rs
@@ -1,9 +1,10 @@
+use std::assert_matches::assert_matches;
+
 use super::errors::{
     AsyncCoroutinesNotSupported, AwaitOnlyInAsyncFnAndBlocks, BaseExpressionDoubleDot,
     ClosureCannotBeStatic, CoroutineTooManyParameters,
     FunctionalRecordUpdateDestructuringAssignment, InclusiveRangeWithNoEnd, MatchArmWithNoBody,
-    NeverPatternWithBody, NeverPatternWithGuard, NotSupportedForLifetimeBinderAsyncClosure,
-    UnderscoreExprLhsAssign,
+    NeverPatternWithBody, NeverPatternWithGuard, UnderscoreExprLhsAssign,
 };
 use super::ResolverAstLoweringExt;
 use super::{ImplTraitContext, LoweringContext, ParamMode, ParenthesizedGenericArgs};
@@ -1028,30 +1029,27 @@ impl<'hir> LoweringContext<'_, 'hir> {
         fn_decl_span: Span,
         fn_arg_span: Span,
     ) -> hir::ExprKind<'hir> {
-        if let &ClosureBinder::For { span, .. } = binder {
-            self.dcx().emit_err(NotSupportedForLifetimeBinderAsyncClosure { span });
-        }
-
         let (binder_clause, generic_params) = self.lower_closure_binder(binder);
 
+        assert_matches!(
+            coroutine_kind,
+            CoroutineKind::Async { .. },
+            "only async closures are supported currently"
+        );
+
         let body = self.with_new_scopes(fn_decl_span, |this| {
+            let inner_decl =
+                FnDecl { inputs: decl.inputs.clone(), output: FnRetTy::Default(fn_decl_span) };
+
             // Transform `async |x: u8| -> X { ... }` into
             // `|x: u8| || -> X { ... }`.
             let body_id = this.lower_body(|this| {
-                let async_ret_ty = if let FnRetTy::Ty(ty) = &decl.output {
-                    let itctx = ImplTraitContext::Disallowed(ImplTraitPosition::AsyncBlock);
-                    Some(hir::FnRetTy::Return(this.lower_ty(ty, &itctx)))
-                } else {
-                    None
-                };
-
                 let (parameters, expr) = this.lower_coroutine_body_with_moved_arguments(
-                    decl,
+                    &inner_decl,
                     |this| this.with_new_scopes(fn_decl_span, |this| this.lower_expr_mut(body)),
                     body.span,
                     coroutine_kind,
                     hir::CoroutineSource::Closure,
-                    async_ret_ty,
                 );
 
                 let hir_id = this.lower_node_id(coroutine_kind.closure_id());
@@ -1062,15 +1060,12 @@ impl<'hir> LoweringContext<'_, 'hir> {
             body_id
         });
 
-        let outer_decl =
-            FnDecl { inputs: decl.inputs.clone(), output: FnRetTy::Default(fn_decl_span) };
-
         let bound_generic_params = self.lower_lifetime_binder(closure_id, generic_params);
         // We need to lower the declaration outside the new scope, because we
         // have to conserve the state of being inside a loop condition for the
         // closure argument types.
         let fn_decl =
-            self.lower_fn_decl(&outer_decl, closure_id, fn_decl_span, FnDeclKind::Closure, None);
+            self.lower_fn_decl(&decl, closure_id, fn_decl_span, FnDeclKind::Closure, None);
 
         let c = self.arena.alloc(hir::Closure {
             def_id: self.local_def_id(closure_id),
@@ -1081,7 +1076,10 @@ impl<'hir> LoweringContext<'_, 'hir> {
             body,
             fn_decl_span: self.lower_span(fn_decl_span),
             fn_arg_span: Some(self.lower_span(fn_arg_span)),
-            kind: hir::ClosureKind::Closure,
+            // Lower this as a `CoroutineClosure`. That will ensure that HIR typeck
+            // knows that a `FnDecl` output type like `-> &str` actually means
+            // "coroutine that returns &str", rather than directly returning a `&str`.
+            kind: hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async),
             constness: hir::Constness::NotConst,
         });
         hir::ExprKind::Closure(c)
diff --git a/compiler/rustc_ast_lowering/src/item.rs b/compiler/rustc_ast_lowering/src/item.rs
index 987f74af0a423..2a3e172f7710a 100644
--- a/compiler/rustc_ast_lowering/src/item.rs
+++ b/compiler/rustc_ast_lowering/src/item.rs
@@ -1091,7 +1091,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 body.span,
                 coroutine_kind,
                 hir::CoroutineSource::Fn,
-                None,
             );
 
             // FIXME(async_fn_track_caller): Can this be moved above?
@@ -1113,7 +1112,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
         body_span: Span,
         coroutine_kind: CoroutineKind,
         coroutine_source: hir::CoroutineSource,
-        return_type_hint: Option<hir::FnRetTy<'hir>>,
     ) -> (&'hir [hir::Param<'hir>], hir::Expr<'hir>) {
         let mut parameters: Vec<hir::Param<'_>> = Vec::new();
         let mut statements: Vec<hir::Stmt<'_>> = Vec::new();
@@ -1283,12 +1281,13 @@ impl<'hir> LoweringContext<'_, 'hir> {
         };
         let closure_id = coroutine_kind.closure_id();
         let coroutine_expr = self.make_desugared_coroutine_expr(
-            // FIXME(async_closures): This should only move locals,
-            // and not upvars. Capturing closure upvars by ref doesn't
-            // work right now anyways, so whatever.
-            CaptureBy::Value { move_kw: rustc_span::DUMMY_SP },
+            // The default capture mode here is by-ref. Later on during upvar analysis,
+            // we will force the captured arguments to by-move, but for async closures,
+            // we want to make sure that we avoid unnecessarily moving captures, or else
+            // all async closures would default to `FnOnce` as their calling mode.
+            CaptureBy::Ref,
             closure_id,
-            return_type_hint,
+            None,
             body_span,
             desugaring_kind,
             coroutine_source,
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index c0b6922fc0512..d6abaa8428bf5 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -33,6 +33,7 @@
 #![allow(internal_features)]
 #![feature(rustdoc_internals)]
 #![doc(rust_logo)]
+#![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(let_chains)]
 #![deny(rustc::untranslatable_diagnostic)]
@@ -298,7 +299,6 @@ enum ImplTraitPosition {
     Path,
     Variable,
     Trait,
-    AsyncBlock,
     Bound,
     Generic,
     ExternFnParam,
@@ -325,7 +325,6 @@ impl std::fmt::Display for ImplTraitPosition {
             ImplTraitPosition::Path => "paths",
             ImplTraitPosition::Variable => "the type of variable bindings",
             ImplTraitPosition::Trait => "traits",
-            ImplTraitPosition::AsyncBlock => "async blocks",
             ImplTraitPosition::Bound => "bounds",
             ImplTraitPosition::Generic => "generics",
             ImplTraitPosition::ExternFnParam => "`extern fn` parameters",
diff --git a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
index b0b7cc076bab5..6debb3362b04c 100644
--- a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
@@ -858,7 +858,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             use crate::session_diagnostics::CaptureVarCause::*;
             match kind {
                 hir::ClosureKind::Coroutine(_) => MoveUseInCoroutine { var_span },
-                hir::ClosureKind::Closure => MoveUseInClosure { var_span },
+                hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
+                    MoveUseInClosure { var_span }
+                }
             }
         });
 
@@ -905,7 +907,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 hir::ClosureKind::Coroutine(_) => {
                     BorrowUsePlaceCoroutine { place: desc_place, var_span, is_single_var: true }
                 }
-                hir::ClosureKind::Closure => {
+                hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
                     BorrowUsePlaceClosure { place: desc_place, var_span, is_single_var: true }
                 }
             }
@@ -1056,7 +1058,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                                     var_span,
                                     is_single_var: true,
                                 },
-                                hir::ClosureKind::Closure => BorrowUsePlaceClosure {
+                                hir::ClosureKind::Closure
+                                | hir::ClosureKind::CoroutineClosure(_) => BorrowUsePlaceClosure {
                                     place: desc_place,
                                     var_span,
                                     is_single_var: true,
@@ -1140,7 +1143,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         var_span,
                         is_single_var: false,
                     },
-                    hir::ClosureKind::Closure => {
+                    hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
                         BorrowUsePlaceClosure { place: desc_place, var_span, is_single_var: false }
                     }
                 }
@@ -1158,7 +1161,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         hir::ClosureKind::Coroutine(_) => {
                             FirstBorrowUsePlaceCoroutine { place: borrow_place_desc, var_span }
                         }
-                        hir::ClosureKind::Closure => {
+                        hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
                             FirstBorrowUsePlaceClosure { place: borrow_place_desc, var_span }
                         }
                     }
@@ -1175,7 +1178,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         hir::ClosureKind::Coroutine(_) => {
                             SecondBorrowUsePlaceCoroutine { place: desc_place, var_span }
                         }
-                        hir::ClosureKind::Closure => {
+                        hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
                             SecondBorrowUsePlaceClosure { place: desc_place, var_span }
                         }
                     }
@@ -2942,7 +2945,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     use crate::session_diagnostics::CaptureVarCause::*;
                     match kind {
                         hir::ClosureKind::Coroutine(_) => BorrowUseInCoroutine { var_span },
-                        hir::ClosureKind::Closure => BorrowUseInClosure { var_span },
+                        hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
+                            BorrowUseInClosure { var_span }
+                        }
                     }
                 });
 
@@ -2958,7 +2963,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             use crate::session_diagnostics::CaptureVarCause::*;
             match kind {
                 hir::ClosureKind::Coroutine(_) => BorrowUseInCoroutine { var_span },
-                hir::ClosureKind::Closure => BorrowUseInClosure { var_span },
+                hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
+                    BorrowUseInClosure { var_span }
+                }
             }
         });
 
diff --git a/compiler/rustc_borrowck/src/diagnostics/mod.rs b/compiler/rustc_borrowck/src/diagnostics/mod.rs
index b35d4e16eccb0..59f3aa706edea 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mod.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mod.rs
@@ -614,7 +614,7 @@ impl UseSpans<'_> {
                         PartialAssignment => AssignPartInCoroutine { path_span },
                     });
                 }
-                hir::ClosureKind::Closure => {
+                hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
                     err.subdiagnostic(match action {
                         Borrow => BorrowInClosure { path_span },
                         MatchOn | Use => UseInClosure { path_span },
@@ -1253,7 +1253,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     hir::ClosureKind::Coroutine(_) => {
                         CaptureVarCause::PartialMoveUseInCoroutine { var_span, is_partial }
                     }
-                    hir::ClosureKind::Closure => {
+                    hir::ClosureKind::Closure | hir::ClosureKind::CoroutineClosure(_) => {
                         CaptureVarCause::PartialMoveUseInClosure { var_span, is_partial }
                     }
                 })
diff --git a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
index 3fddf67f55b97..55649ec2f1645 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
@@ -1472,7 +1472,7 @@ fn suggest_ampmut<'tcx>(
 }
 
 fn is_closure_or_coroutine(ty: Ty<'_>) -> bool {
-    ty.is_closure() || ty.is_coroutine()
+    ty.is_closure() || ty.is_coroutine() || ty.is_coroutine_closure()
 }
 
 /// Given a field that needs to be mutable, returns a span where the " mut " could go.
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_name.rs b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
index 15e1066e983a9..c91b8eaab055f 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_name.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
@@ -324,9 +324,13 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                 ty::BoundRegionKind::BrEnv => {
                     let def_ty = self.regioncx.universal_regions().defining_ty;
 
-                    let DefiningTy::Closure(_, args) = def_ty else {
-                        // Can't have BrEnv in functions, constants or coroutines.
-                        bug!("BrEnv outside of closure.");
+                    let closure_kind = match def_ty {
+                        DefiningTy::Closure(_, args) => args.as_closure().kind(),
+                        DefiningTy::CoroutineClosure(_, args) => args.as_coroutine_closure().kind(),
+                        _ => {
+                            // Can't have BrEnv in functions, constants or coroutines.
+                            bug!("BrEnv outside of closure.");
+                        }
                     };
                     let hir::ExprKind::Closure(&hir::Closure { fn_decl_span, .. }) =
                         tcx.hir().expect_expr(self.mir_hir_id()).kind
@@ -334,21 +338,18 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                         bug!("Closure is not defined by a closure expr");
                     };
                     let region_name = self.synthesize_region_name();
-
-                    let closure_kind_ty = args.as_closure().kind_ty();
-                    let note = match closure_kind_ty.to_opt_closure_kind() {
-                        Some(ty::ClosureKind::Fn) => {
+                    let note = match closure_kind {
+                        ty::ClosureKind::Fn => {
                             "closure implements `Fn`, so references to captured variables \
                              can't escape the closure"
                         }
-                        Some(ty::ClosureKind::FnMut) => {
+                        ty::ClosureKind::FnMut => {
                             "closure implements `FnMut`, so references to captured variables \
                              can't escape the closure"
                         }
-                        Some(ty::ClosureKind::FnOnce) => {
+                        ty::ClosureKind::FnOnce => {
                             bug!("BrEnv in a `FnOnce` closure");
                         }
-                        None => bug!("Closure kind not inferred in borrow check"),
                     };
 
                     Some(RegionName {
@@ -692,7 +693,10 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
                         hir::CoroutineDesugaring::Async,
                         hir::CoroutineSource::Closure,
-                    )) => " of async closure",
+                    ))
+                    | hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async) => {
+                        " of async closure"
+                    }
 
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
                         hir::CoroutineDesugaring::Async,
@@ -719,7 +723,10 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
                         hir::CoroutineDesugaring::Gen,
                         hir::CoroutineSource::Closure,
-                    )) => " of gen closure",
+                    ))
+                    | hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Gen) => {
+                        " of gen closure"
+                    }
 
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
                         hir::CoroutineDesugaring::Gen,
@@ -743,7 +750,10 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
                         hir::CoroutineDesugaring::AsyncGen,
                         hir::CoroutineSource::Closure,
-                    )) => " of async gen closure",
+                    ))
+                    | hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::AsyncGen) => {
+                        " of async gen closure"
+                    }
 
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
                         hir::CoroutineDesugaring::AsyncGen,
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 8b5e548345c97..bb64571889bae 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -3,6 +3,7 @@
 #![allow(internal_features)]
 #![feature(rustdoc_internals)]
 #![doc(rust_logo)]
+#![feature(assert_matches)]
 #![feature(associated_type_bounds)]
 #![feature(box_patterns)]
 #![feature(let_chains)]
@@ -1303,7 +1304,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 // moved into the closure and subsequently used by the closure,
                 // in order to populate our used_mut set.
                 match **aggregate_kind {
-                    AggregateKind::Closure(def_id, _) | AggregateKind::Coroutine(def_id, _) => {
+                    AggregateKind::Closure(def_id, _)
+                    | AggregateKind::CoroutineClosure(def_id, _)
+                    | AggregateKind::Coroutine(def_id, _) => {
                         let def_id = def_id.expect_local();
                         let BorrowCheckResult { used_mut_upvars, .. } =
                             self.infcx.tcx.mir_borrowck(def_id);
@@ -1609,6 +1612,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     | ty::FnPtr(_)
                     | ty::Dynamic(_, _, _)
                     | ty::Closure(_, _)
+                    | ty::CoroutineClosure(_, _)
                     | ty::Coroutine(_, _)
                     | ty::CoroutineWitness(..)
                     | ty::Never
@@ -1633,7 +1637,10 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                             return;
                         }
                     }
-                    ty::Closure(_, _) | ty::Coroutine(_, _) | ty::Tuple(_) => (),
+                    ty::Closure(..)
+                    | ty::CoroutineClosure(..)
+                    | ty::Coroutine(_, _)
+                    | ty::Tuple(_) => (),
                     ty::Bool
                     | ty::Char
                     | ty::Int(_)
diff --git a/compiler/rustc_borrowck/src/path_utils.rs b/compiler/rustc_borrowck/src/path_utils.rs
index 2d997dfadf004..4cfde47664eee 100644
--- a/compiler/rustc_borrowck/src/path_utils.rs
+++ b/compiler/rustc_borrowck/src/path_utils.rs
@@ -164,7 +164,7 @@ pub(crate) fn is_upvar_field_projection<'tcx>(
     match place_ref.last_projection() {
         Some((place_base, ProjectionElem::Field(field, _ty))) => {
             let base_ty = place_base.ty(body, tcx).ty;
-            if (base_ty.is_closure() || base_ty.is_coroutine())
+            if (base_ty.is_closure() || base_ty.is_coroutine() || base_ty.is_coroutine_closure())
                 && (!by_ref || upvars[field.index()].is_by_ref())
             {
                 Some(field)
diff --git a/compiler/rustc_borrowck/src/type_check/input_output.rs b/compiler/rustc_borrowck/src/type_check/input_output.rs
index 59518f68ab149..a5a7ce4ea3e86 100644
--- a/compiler/rustc_borrowck/src/type_check/input_output.rs
+++ b/compiler/rustc_borrowck/src/type_check/input_output.rs
@@ -7,13 +7,18 @@
 //! `RETURN_PLACE` the MIR arguments) are always fully normalized (and
 //! contain revealed `impl Trait` values).
 
+use std::assert_matches::assert_matches;
+
 use itertools::Itertools;
-use rustc_infer::infer::BoundRegionConversionTime;
+use rustc_hir as hir;
+use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
+use rustc_infer::infer::{BoundRegionConversionTime, RegionVariableOrigin};
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, Ty};
 use rustc_span::Span;
 
-use crate::universal_regions::UniversalRegions;
+use crate::renumber::RegionCtxt;
+use crate::universal_regions::{DefiningTy, UniversalRegions};
 
 use super::{Locations, TypeChecker};
 
@@ -23,9 +28,11 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
     #[instrument(skip(self, body), level = "debug")]
     pub(super) fn check_signature_annotation(&mut self, body: &Body<'tcx>) {
         let mir_def_id = body.source.def_id().expect_local();
+
         if !self.tcx().is_closure_or_coroutine(mir_def_id.to_def_id()) {
             return;
         }
+
         let user_provided_poly_sig = self.tcx().closure_user_provided_sig(mir_def_id);
 
         // Instantiate the canonicalized variables from user-provided signature
@@ -34,12 +41,75 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         // so that they represent the view from "inside" the closure.
         let user_provided_sig = self
             .instantiate_canonical_with_fresh_inference_vars(body.span, &user_provided_poly_sig);
-        let user_provided_sig = self.infcx.instantiate_binder_with_fresh_vars(
+        let mut user_provided_sig = self.infcx.instantiate_binder_with_fresh_vars(
             body.span,
             BoundRegionConversionTime::FnCall,
             user_provided_sig,
         );
 
+        // FIXME(async_closures): It's kind of wacky that we must apply this
+        // transformation here, since we do the same thing in HIR typeck.
+        // Maybe we could just fix up the canonicalized signature during HIR typeck?
+        if let DefiningTy::CoroutineClosure(_, args) =
+            self.borrowck_context.universal_regions.defining_ty
+        {
+            assert_matches!(
+                self.tcx().coroutine_kind(self.tcx().coroutine_for_closure(mir_def_id)),
+                Some(hir::CoroutineKind::Desugared(
+                    hir::CoroutineDesugaring::Async,
+                    hir::CoroutineSource::Closure
+                )),
+                "this needs to be modified if we're lowering non-async closures"
+            );
+            // Make sure to use the args from `DefiningTy` so the right NLL region vids are prepopulated
+            // into the type.
+            let args = args.as_coroutine_closure();
+            let tupled_upvars_ty = ty::CoroutineClosureSignature::tupled_upvars_by_closure_kind(
+                self.tcx(),
+                args.kind(),
+                Ty::new_tup(self.tcx(), user_provided_sig.inputs()),
+                args.tupled_upvars_ty(),
+                args.coroutine_captures_by_ref_ty(),
+                self.infcx.next_region_var(RegionVariableOrigin::MiscVariable(body.span), || {
+                    RegionCtxt::Unknown
+                }),
+            );
+
+            let next_ty_var = || {
+                self.infcx.next_ty_var(TypeVariableOrigin {
+                    span: body.span,
+                    kind: TypeVariableOriginKind::MiscVariable,
+                })
+            };
+            let output_ty = Ty::new_coroutine(
+                self.tcx(),
+                self.tcx().coroutine_for_closure(mir_def_id),
+                ty::CoroutineArgs::new(
+                    self.tcx(),
+                    ty::CoroutineArgsParts {
+                        parent_args: args.parent_args(),
+                        kind_ty: Ty::from_closure_kind(self.tcx(), args.kind()),
+                        return_ty: user_provided_sig.output(),
+                        tupled_upvars_ty,
+                        // For async closures, none of these can be annotated, so just fill
+                        // them with fresh ty vars.
+                        resume_ty: next_ty_var(),
+                        yield_ty: next_ty_var(),
+                        witness: next_ty_var(),
+                    },
+                )
+                .args,
+            );
+
+            user_provided_sig = self.tcx().mk_fn_sig(
+                user_provided_sig.inputs().iter().copied(),
+                output_ty,
+                user_provided_sig.c_variadic,
+                user_provided_sig.unsafety,
+                user_provided_sig.abi,
+            );
+        }
+
         let is_coroutine_with_implicit_resume_ty = self.tcx().is_coroutine(mir_def_id.to_def_id())
             && user_provided_sig.inputs().is_empty();
 
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index 59c4d9a6c78ca..cdb187e07760a 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -808,6 +808,14 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
                         }),
                     };
                 }
+                ty::CoroutineClosure(_, args) => {
+                    return match args.as_coroutine_closure().upvar_tys().get(field.index()) {
+                        Some(&ty) => Ok(ty),
+                        None => Err(FieldAccessError::OutOfRange {
+                            field_count: args.as_coroutine_closure().upvar_tys().len(),
+                        }),
+                    };
+                }
                 ty::Coroutine(_, args) => {
                     // Only prefix fields (upvars and current state) are
                     // accessible without a variant index.
@@ -1875,6 +1883,14 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                     }),
                 }
             }
+            AggregateKind::CoroutineClosure(_, args) => {
+                match args.as_coroutine_closure().upvar_tys().get(field_index.as_usize()) {
+                    Some(ty) => Ok(*ty),
+                    None => Err(FieldAccessError::OutOfRange {
+                        field_count: args.as_coroutine_closure().upvar_tys().len(),
+                    }),
+                }
+            }
             AggregateKind::Array(ty) => Ok(ty),
             AggregateKind::Tuple => {
                 unreachable!("This should have been covered in check_rvalues");
@@ -2478,6 +2494,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 AggregateKind::Tuple => None,
                 AggregateKind::Closure(_, _) => None,
                 AggregateKind::Coroutine(_, _) => None,
+                AggregateKind::CoroutineClosure(_, _) => None,
             },
         }
     }
@@ -2705,7 +2722,9 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
             // desugaring. A closure gets desugared to a struct, and
             // these extra requirements are basically like where
             // clauses on the struct.
-            AggregateKind::Closure(def_id, args) | AggregateKind::Coroutine(def_id, args) => (
+            AggregateKind::Closure(def_id, args)
+            | AggregateKind::CoroutineClosure(def_id, args)
+            | AggregateKind::Coroutine(def_id, args) => (
                 def_id,
                 self.prove_closure_bounds(
                     tcx,
@@ -2754,10 +2773,15 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         let typeck_root_args = ty::GenericArgs::identity_for_item(tcx, typeck_root_def_id);
 
         let parent_args = match tcx.def_kind(def_id) {
-            DefKind::Closure if tcx.is_coroutine(def_id.to_def_id()) => {
-                args.as_coroutine().parent_args()
+            // We don't want to dispatch on 3 different kind of closures here, so take
+            // advantage of the fact that the `parent_args` is the same length as the
+            // `typeck_root_args`.
+            DefKind::Closure => {
+                // FIXME(async_closures): It may be useful to add a debug assert here
+                // to actually call `type_of` and check the `parent_args` are the same
+                // length as the `typeck_root_args`.
+                &args[..typeck_root_args.len()]
             }
-            DefKind::Closure => args.as_closure().parent_args(),
             DefKind::InlineConst => args.as_inline_const().parent_args(),
             other => bug!("unexpected item {:?}", other),
         };
diff --git a/compiler/rustc_borrowck/src/universal_regions.rs b/compiler/rustc_borrowck/src/universal_regions.rs
index ae8a135f09059..111eaaf60f7b2 100644
--- a/compiler/rustc_borrowck/src/universal_regions.rs
+++ b/compiler/rustc_borrowck/src/universal_regions.rs
@@ -97,6 +97,13 @@ pub enum DefiningTy<'tcx> {
     /// `ClosureArgs::coroutine_return_ty`.
     Coroutine(DefId, GenericArgsRef<'tcx>),
 
+    /// The MIR is a special kind of closure that returns coroutines.
+    ///
+    /// See the documentation on `CoroutineClosureSignature` for details
+    /// on how to construct the callable signature of the coroutine from
+    /// its args.
+    CoroutineClosure(DefId, GenericArgsRef<'tcx>),
+
     /// The MIR is a fn item with the given `DefId` and args. The signature
     /// of the function can be bound then with the `fn_sig` query.
     FnDef(DefId, GenericArgsRef<'tcx>),
@@ -119,6 +126,7 @@ impl<'tcx> DefiningTy<'tcx> {
     pub fn upvar_tys(self) -> &'tcx ty::List<Ty<'tcx>> {
         match self {
             DefiningTy::Closure(_, args) => args.as_closure().upvar_tys(),
+            DefiningTy::CoroutineClosure(_, args) => args.as_coroutine_closure().upvar_tys(),
             DefiningTy::Coroutine(_, args) => args.as_coroutine().upvar_tys(),
             DefiningTy::FnDef(..) | DefiningTy::Const(..) | DefiningTy::InlineConst(..) => {
                 ty::List::empty()
@@ -131,7 +139,9 @@ impl<'tcx> DefiningTy<'tcx> {
     /// user's code.
     pub fn implicit_inputs(self) -> usize {
         match self {
-            DefiningTy::Closure(..) | DefiningTy::Coroutine(..) => 1,
+            DefiningTy::Closure(..)
+            | DefiningTy::CoroutineClosure(..)
+            | DefiningTy::Coroutine(..) => 1,
             DefiningTy::FnDef(..) | DefiningTy::Const(..) | DefiningTy::InlineConst(..) => 0,
         }
     }
@@ -147,6 +157,7 @@ impl<'tcx> DefiningTy<'tcx> {
     pub fn def_id(&self) -> DefId {
         match *self {
             DefiningTy::Closure(def_id, ..)
+            | DefiningTy::CoroutineClosure(def_id, ..)
             | DefiningTy::Coroutine(def_id, ..)
             | DefiningTy::FnDef(def_id, ..)
             | DefiningTy::Const(def_id, ..)
@@ -355,6 +366,9 @@ impl<'tcx> UniversalRegions<'tcx> {
                     err.note(format!("late-bound region is {:?}", self.to_region_vid(r)));
                 });
             }
+            DefiningTy::CoroutineClosure(..) => {
+                todo!()
+            }
             DefiningTy::Coroutine(def_id, args) => {
                 let v = with_no_trimmed_paths!(
                     args[tcx.generics_of(def_id).parent_count..]
@@ -568,6 +582,9 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {
                 match *defining_ty.kind() {
                     ty::Closure(def_id, args) => DefiningTy::Closure(def_id, args),
                     ty::Coroutine(def_id, args) => DefiningTy::Coroutine(def_id, args),
+                    ty::CoroutineClosure(def_id, args) => {
+                        DefiningTy::CoroutineClosure(def_id, args)
+                    }
                     ty::FnDef(def_id, args) => DefiningTy::FnDef(def_id, args),
                     _ => span_bug!(
                         tcx.def_span(self.mir_def),
@@ -623,6 +640,7 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {
         let identity_args = GenericArgs::identity_for_item(tcx, typeck_root_def_id);
         let fr_args = match defining_ty {
             DefiningTy::Closure(_, args)
+            | DefiningTy::CoroutineClosure(_, args)
             | DefiningTy::Coroutine(_, args)
             | DefiningTy::InlineConst(_, args) => {
                 // In the case of closures, we rely on the fact that
@@ -702,6 +720,55 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {
                 ty::Binder::dummy(inputs_and_output)
             }
 
+            // Construct the signature of the CoroutineClosure for the purposes of borrowck.
+            // This is pretty straightforward -- we:
+            // 1. first grab the `coroutine_closure_sig`,
+            // 2. compute the self type (`&`/`&mut`/no borrow),
+            // 3. flatten the tupled_input_tys,
+            // 4. construct the correct generator type to return with
+            //    `CoroutineClosureSignature::to_coroutine_given_kind_and_upvars`.
+            // Then we wrap it all up into a list of inputs and output.
+            DefiningTy::CoroutineClosure(def_id, args) => {
+                assert_eq!(self.mir_def.to_def_id(), def_id);
+                let closure_sig = args.as_coroutine_closure().coroutine_closure_sig();
+                let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
+                    closure_sig
+                        .bound_vars()
+                        .iter()
+                        .chain(iter::once(ty::BoundVariableKind::Region(ty::BrEnv))),
+                );
+                let br = ty::BoundRegion {
+                    var: ty::BoundVar::from_usize(bound_vars.len() - 1),
+                    kind: ty::BrEnv,
+                };
+                let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
+                let closure_kind = args.as_coroutine_closure().kind();
+
+                let closure_ty = tcx.closure_env_ty(
+                    Ty::new_coroutine_closure(tcx, def_id, args),
+                    closure_kind,
+                    env_region,
+                );
+
+                let inputs = closure_sig.skip_binder().tupled_inputs_ty.tuple_fields();
+                let output = closure_sig.skip_binder().to_coroutine_given_kind_and_upvars(
+                    tcx,
+                    args.as_coroutine_closure().parent_args(),
+                    tcx.coroutine_for_closure(def_id),
+                    closure_kind,
+                    env_region,
+                    args.as_coroutine_closure().tupled_upvars_ty(),
+                    args.as_coroutine_closure().coroutine_captures_by_ref_ty(),
+                );
+
+                ty::Binder::bind_with_vars(
+                    tcx.mk_type_list_from_iter(
+                        iter::once(closure_ty).chain(inputs).chain(iter::once(output)),
+                    ),
+                    bound_vars,
+                )
+            }
+
             DefiningTy::FnDef(def_id, _) => {
                 let sig = tcx.fn_sig(def_id).instantiate_identity();
                 let sig = indices.fold_to_region_vids(tcx, sig);
diff --git a/compiler/rustc_codegen_gcc/src/type_of.rs b/compiler/rustc_codegen_gcc/src/type_of.rs
index e5c0b2de4ca46..25149b8020162 100644
--- a/compiler/rustc_codegen_gcc/src/type_of.rs
+++ b/compiler/rustc_codegen_gcc/src/type_of.rs
@@ -87,7 +87,7 @@ fn uncached_gcc_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, layout: TyAndLayout
         // FIXME(eddyb) producing readable type names for trait objects can result
         // in problematically distinct types due to HRTB and subtyping (see #47638).
         // ty::Dynamic(..) |
-        ty::Adt(..) | ty::Closure(..) | ty::Foreign(..) | ty::Coroutine(..) | ty::Str
+        ty::Adt(..) | ty::Closure(..) | ty::CoroutineClosure(..) | ty::Foreign(..) | ty::Coroutine(..) | ty::Str
             if !cx.sess().fewer_names() =>
         {
             let mut name = with_no_trimmed_paths!(layout.ty.to_string());
diff --git a/compiler/rustc_codegen_llvm/src/type_of.rs b/compiler/rustc_codegen_llvm/src/type_of.rs
index e88f4217c9dca..219c702531141 100644
--- a/compiler/rustc_codegen_llvm/src/type_of.rs
+++ b/compiler/rustc_codegen_llvm/src/type_of.rs
@@ -33,7 +33,7 @@ fn uncached_llvm_type<'a, 'tcx>(
         // FIXME(eddyb) producing readable type names for trait objects can result
         // in problematically distinct types due to HRTB and subtyping (see #47638).
         // ty::Dynamic(..) |
-        ty::Adt(..) | ty::Closure(..) | ty::Foreign(..) | ty::Coroutine(..) | ty::Str
+        ty::Adt(..) | ty::Closure(..) | ty::CoroutineClosure(..) | ty::Foreign(..) | ty::Coroutine(..) | ty::Str
             // For performance reasons we use names only when emitting LLVM IR.
             if !cx.sess().fewer_names() =>
         {
diff --git a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
index 4f9f70648bd88..5bd7442822a21 100644
--- a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
+++ b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
@@ -398,7 +398,9 @@ fn push_debuginfo_type_name<'tcx>(
             // processing
             visited.remove(&t);
         }
-        ty::Closure(def_id, args) | ty::Coroutine(def_id, args, ..) => {
+        ty::Closure(def_id, args)
+        | ty::CoroutineClosure(def_id, args)
+        | ty::Coroutine(def_id, args, ..) => {
             // Name will be "{closure_env#0}<T1, T2, ...>", "{coroutine_env#0}<T1, T2, ...>", or
             // "{async_fn_env#0}<T1, T2, ...>", etc.
             // In the case of cpp-like debuginfo, the name additionally gets wrapped inside of
@@ -768,6 +770,8 @@ fn push_closure_or_coroutine_name<'tcx>(
 
     // Truncate the args to the length of the above generics. This will cut off
     // anything closure- or coroutine-specific.
+    // FIXME(async_closures): This is probably not going to be correct w.r.t.
+    // multiple coroutine flavors. Maybe truncate to (parent + 1)?
     let args = args.truncate_to(tcx, generics);
     push_generic_params_internal(tcx, args, enclosing_fn_def_id, output, visited);
 }
diff --git a/compiler/rustc_const_eval/src/const_eval/valtrees.rs b/compiler/rustc_const_eval/src/const_eval/valtrees.rs
index 12544f5b02955..5c2bf4626c4c3 100644
--- a/compiler/rustc_const_eval/src/const_eval/valtrees.rs
+++ b/compiler/rustc_const_eval/src/const_eval/valtrees.rs
@@ -172,6 +172,7 @@ pub(crate) fn const_to_valtree_inner<'tcx>(
         | ty::Infer(_)
         // FIXME(oli-obk): we can probably encode closures just like structs
         | ty::Closure(..)
+        | ty::CoroutineClosure(..)
         | ty::Coroutine(..)
         | ty::CoroutineWitness(..) => Err(ValTreeCreationError::NonSupportedType),
     }
@@ -301,6 +302,7 @@ pub fn valtree_to_const_value<'tcx>(
         | ty::Placeholder(..)
         | ty::Infer(_)
         | ty::Closure(..)
+        | ty::CoroutineClosure(..)
         | ty::Coroutine(..)
         | ty::CoroutineWitness(..)
         | ty::FnPtr(_)
diff --git a/compiler/rustc_const_eval/src/interpret/eval_context.rs b/compiler/rustc_const_eval/src/interpret/eval_context.rs
index c14bd142efacc..dd989ab80fd3c 100644
--- a/compiler/rustc_const_eval/src/interpret/eval_context.rs
+++ b/compiler/rustc_const_eval/src/interpret/eval_context.rs
@@ -1007,6 +1007,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 | ty::CoroutineWitness(..)
                 | ty::Array(..)
                 | ty::Closure(..)
+                | ty::CoroutineClosure(..)
                 | ty::Never
                 | ty::Error(_) => true,
 
diff --git a/compiler/rustc_const_eval/src/interpret/intrinsics.rs b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
index 1e9e7d94596f8..7991f90b81549 100644
--- a/compiler/rustc_const_eval/src/interpret/intrinsics.rs
+++ b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
@@ -85,6 +85,7 @@ pub(crate) fn eval_nullary_intrinsic<'tcx>(
             | ty::FnPtr(_)
             | ty::Dynamic(_, _, _)
             | ty::Closure(_, _)
+            | ty::CoroutineClosure(_, _)
             | ty::Coroutine(_, _)
             | ty::CoroutineWitness(..)
             | ty::Never
diff --git a/compiler/rustc_const_eval/src/interpret/terminator.rs b/compiler/rustc_const_eval/src/interpret/terminator.rs
index b7ffb4a16fc31..85a2e4778d252 100644
--- a/compiler/rustc_const_eval/src/interpret/terminator.rs
+++ b/compiler/rustc_const_eval/src/interpret/terminator.rs
@@ -545,6 +545,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             ty::InstanceDef::VTableShim(..)
             | ty::InstanceDef::ReifyShim(..)
             | ty::InstanceDef::ClosureOnceShim { .. }
+            | ty::InstanceDef::ConstructCoroutineInClosureShim { .. }
+            | ty::InstanceDef::CoroutineKindShim { .. }
             | ty::InstanceDef::FnPtrShim(..)
             | ty::InstanceDef::DropGlue(..)
             | ty::InstanceDef::CloneShim(..)
diff --git a/compiler/rustc_const_eval/src/interpret/validity.rs b/compiler/rustc_const_eval/src/interpret/validity.rs
index b5cd32595201f..811c2c3c208e0 100644
--- a/compiler/rustc_const_eval/src/interpret/validity.rs
+++ b/compiler/rustc_const_eval/src/interpret/validity.rs
@@ -644,6 +644,7 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
             | ty::Str
             | ty::Dynamic(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..) => Ok(false),
             // Some types only occur during typechecking, they have no layout.
             // We should not see them here and we could not check them anyway.
diff --git a/compiler/rustc_const_eval/src/transform/validate.rs b/compiler/rustc_const_eval/src/transform/validate.rs
index 21bdb66a27631..c4542aaa7b2fb 100644
--- a/compiler/rustc_const_eval/src/transform/validate.rs
+++ b/compiler/rustc_const_eval/src/transform/validate.rs
@@ -58,6 +58,7 @@ impl<'tcx> MirPass<'tcx> for Validator {
             let body_abi = match body_ty.kind() {
                 ty::FnDef(..) => body_ty.fn_sig(tcx).abi(),
                 ty::Closure(..) => Abi::RustCall,
+                ty::CoroutineClosure(..) => Abi::RustCall,
                 ty::Coroutine(..) => Abi::Rust,
                 _ => {
                     span_bug!(body.span, "unexpected body ty: {:?} phase {:?}", body_ty, mir_phase)
@@ -665,6 +666,14 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                         };
                         check_equal(self, location, f_ty);
                     }
+                    ty::CoroutineClosure(_, args) => {
+                        let args = args.as_coroutine_closure();
+                        let Some(&f_ty) = args.upvar_tys().get(f.as_usize()) else {
+                            fail_out_of_bounds(self, location);
+                            return;
+                        };
+                        check_equal(self, location, f_ty);
+                    }
                     &ty::Coroutine(def_id, args) => {
                         let f_ty = if let Some(var) = parent_ty.variant_index {
                             let gen_body = if def_id == self.body.source.def_id() {
@@ -861,6 +870,20 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                         }
                     }
                 }
+                AggregateKind::CoroutineClosure(_, args) => {
+                    let upvars = args.as_coroutine_closure().upvar_tys();
+                    if upvars.len() != fields.len() {
+                        self.fail(
+                            location,
+                            "coroutine-closure has the wrong number of initialized fields",
+                        );
+                    }
+                    for (src, dest) in std::iter::zip(fields, upvars) {
+                        if !self.mir_assign_valid_types(src.ty(self.body, self.tcx), dest) {
+                            self.fail(location, "coroutine-closure field has the wrong type");
+                        }
+                    }
+                }
             },
             Rvalue::Ref(_, BorrowKind::Fake, _) => {
                 if self.mir_phase >= MirPhase::Runtime(RuntimePhase::Initial) {
diff --git a/compiler/rustc_const_eval/src/util/type_name.rs b/compiler/rustc_const_eval/src/util/type_name.rs
index 976e42ad76836..2b80623ab4545 100644
--- a/compiler/rustc_const_eval/src/util/type_name.rs
+++ b/compiler/rustc_const_eval/src/util/type_name.rs
@@ -51,6 +51,7 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
             | ty::FnDef(def_id, args)
             | ty::Alias(ty::Projection | ty::Opaque, ty::AliasTy { def_id, args, .. })
             | ty::Closure(def_id, args)
+            | ty::CoroutineClosure(def_id, args)
             | ty::Coroutine(def_id, args) => self.print_def_path(def_id, args),
             ty::Foreign(def_id) => self.print_def_path(def_id, &[]),
 
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index de1b28acb1267..ff50086ff8f98 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -952,6 +952,11 @@ pub enum ClosureKind {
     ///  usage (e.g. `let x = || { yield (); }`) or from a desugared expression
     /// (e.g. `async` and `gen` blocks).
     Coroutine(CoroutineKind),
+    /// This is a coroutine-closure, which is a special sugared closure that
+    /// returns one of the sugared coroutine (`async`/`gen`/`async gen`). It
+    /// additionally allows capturing the coroutine's upvars by ref, and therefore
+    /// needs to be specially treated during analysis and borrowck.
+    CoroutineClosure(CoroutineDesugaring),
 }
 
 /// A block of statements `{ .. }`, which may have a label (in this case the
@@ -3698,6 +3703,7 @@ impl<'hir> Node<'hir> {
         expect_generic_param, &'hir GenericParam<'hir>, Node::GenericParam(n), n;
         expect_crate,         &'hir Mod<'hir>,          Node::Crate(n),        n;
         expect_infer,         &'hir InferArg,           Node::Infer(n),        n;
+        expect_closure,       &'hir Closure<'hir>, Node::Expr(Expr { kind: ExprKind::Closure(n), .. }), n;
     }
 }
 
diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
index 8e327c029dffc..9c9e72d6e6512 100644
--- a/compiler/rustc_hir/src/lang_items.rs
+++ b/compiler/rustc_hir/src/lang_items.rs
@@ -209,6 +209,7 @@ language_item_table! {
     AsyncFn,                 sym::async_fn,            async_fn_trait,             Target::Trait,          GenericRequirement::Exact(1);
     AsyncFnMut,              sym::async_fn_mut,        async_fn_mut_trait,         Target::Trait,          GenericRequirement::Exact(1);
     AsyncFnOnce,             sym::async_fn_once,       async_fn_once_trait,        Target::Trait,          GenericRequirement::Exact(1);
+    AsyncFnKindHelper,       sym::async_fn_kind_helper,async_fn_kind_helper,       Target::Trait,          GenericRequirement::Exact(1);
 
     FnOnceOutput,            sym::fn_once_output,      fn_once_output,             Target::AssocTy,        GenericRequirement::None;
 
diff --git a/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs b/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
index abef365c3ca3c..0df5a57bc2c45 100644
--- a/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
@@ -171,6 +171,7 @@ impl<'tcx> InherentCollect<'tcx> {
             }
             ty::FnDef(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Bound(..)
diff --git a/compiler/rustc_hir_analysis/src/coherence/orphan.rs b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
index 1736de760d5a6..45641be52d2f2 100644
--- a/compiler/rustc_hir_analysis/src/coherence/orphan.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
@@ -244,6 +244,7 @@ fn do_orphan_check_impl<'tcx>(
             | ty::Tuple(..) => (LocalImpl::Allow, NonlocalImpl::DisallowOther),
 
             ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Bound(..)
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index 8d862d5eb715f..fbcebb7c87c9b 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -81,6 +81,7 @@ pub fn provide(providers: &mut Providers) {
         impl_trait_ref,
         impl_polarity,
         coroutine_kind,
+        coroutine_for_closure,
         collect_mod_item_types,
         is_type_alias_impl_trait,
         ..*providers
@@ -1531,6 +1532,29 @@ fn coroutine_kind(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<hir::CoroutineK
     }
 }
 
+fn coroutine_for_closure(tcx: TyCtxt<'_>, def_id: LocalDefId) -> DefId {
+    let &rustc_hir::Closure { kind: hir::ClosureKind::CoroutineClosure(_), body, .. } =
+        tcx.hir_node_by_def_id(def_id).expect_closure()
+    else {
+        bug!()
+    };
+
+    let &hir::Expr {
+        kind:
+            hir::ExprKind::Closure(&rustc_hir::Closure {
+                def_id,
+                kind: hir::ClosureKind::Coroutine(_),
+                ..
+            }),
+        ..
+    } = tcx.hir().body(body).value
+    else {
+        bug!()
+    };
+
+    def_id.to_def_id()
+}
+
 fn is_type_alias_impl_trait<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> bool {
     match tcx.hir_node_by_def_id(def_id) {
         Node::Item(hir::Item { kind: hir::ItemKind::OpaqueTy(opaque), .. }) => {
diff --git a/compiler/rustc_hir_analysis/src/collect/generics_of.rs b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
index c29d413184304..1dabb6feb5e1b 100644
--- a/compiler/rustc_hir_analysis/src/collect/generics_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
@@ -349,6 +349,13 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
             ClosureKind::Coroutine(_) => {
                 &["<resume_ty>", "<yield_ty>", "<return_ty>", "<witness>", "<upvars>"][..]
             }
+            ClosureKind::CoroutineClosure(_) => &[
+                "<closure_kind>",
+                "<closure_signature_parts>",
+                "<upvars>",
+                "<bound_captures_by_ref>",
+                "<witness>",
+            ][..],
         };
 
         params.extend(dummy_args.iter().map(|&arg| ty::GenericParamDef {
diff --git a/compiler/rustc_hir_analysis/src/variance/constraints.rs b/compiler/rustc_hir_analysis/src/variance/constraints.rs
index f09594cbbc667..580cdb4a3a209 100644
--- a/compiler/rustc_hir_analysis/src/variance/constraints.rs
+++ b/compiler/rustc_hir_analysis/src/variance/constraints.rs
@@ -235,8 +235,8 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
                 // leaf type -- noop
             }
 
-            ty::FnDef(..) | ty::Coroutine(..) | ty::Closure(..) => {
-                bug!("Unexpected closure type in variance computation");
+            ty::FnDef(..) | ty::Coroutine(..) | ty::Closure(..) | ty::CoroutineClosure(..) => {
+                bug!("Unexpected coroutine/closure type in variance computation");
             }
 
             ty::Ref(region, ty, mutbl) => {
diff --git a/compiler/rustc_hir_typeck/src/callee.rs b/compiler/rustc_hir_typeck/src/callee.rs
index b263c98553421..fbe6f454dbc92 100644
--- a/compiler/rustc_hir_typeck/src/callee.rs
+++ b/compiler/rustc_hir_typeck/src/callee.rs
@@ -141,33 +141,77 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 return Some(CallStep::Builtin(adjusted_ty));
             }
 
-            ty::Closure(def_id, args) => {
+            // Check whether this is a call to a closure where we
+            // haven't yet decided on whether the closure is fn vs
+            // fnmut vs fnonce. If so, we have to defer further processing.
+            ty::Closure(def_id, args) if self.closure_kind(adjusted_ty).is_none() => {
                 let def_id = def_id.expect_local();
+                let closure_sig = args.as_closure().sig();
+                let closure_sig = self.instantiate_binder_with_fresh_vars(
+                    call_expr.span,
+                    infer::FnCall,
+                    closure_sig,
+                );
+                let adjustments = self.adjust_steps(autoderef);
+                self.record_deferred_call_resolution(
+                    def_id,
+                    DeferredCallResolution {
+                        call_expr,
+                        callee_expr,
+                        closure_ty: adjusted_ty,
+                        adjustments,
+                        fn_sig: closure_sig,
+                    },
+                );
+                return Some(CallStep::DeferredClosure(def_id, closure_sig));
+            }
 
-                // Check whether this is a call to a closure where we
-                // haven't yet decided on whether the closure is fn vs
-                // fnmut vs fnonce. If so, we have to defer further processing.
-                if self.closure_kind(args).is_none() {
-                    let closure_sig = args.as_closure().sig();
-                    let closure_sig = self.instantiate_binder_with_fresh_vars(
-                        call_expr.span,
-                        infer::FnCall,
-                        closure_sig,
-                    );
-                    let adjustments = self.adjust_steps(autoderef);
-                    self.record_deferred_call_resolution(
-                        def_id,
-                        DeferredCallResolution {
-                            call_expr,
-                            callee_expr,
-                            adjusted_ty,
-                            adjustments,
-                            fn_sig: closure_sig,
-                            closure_args: args,
-                        },
-                    );
-                    return Some(CallStep::DeferredClosure(def_id, closure_sig));
-                }
+            // When calling a `CoroutineClosure` that is local to the body, we will
+            // not know what its `closure_kind` is yet. Instead, just fill in the
+            // signature with an infer var for the `tupled_upvars_ty` of the coroutine,
+            // and record a deferred call resolution which will constrain that var
+            // as part of `AsyncFn*` trait confirmation.
+            ty::CoroutineClosure(def_id, args) if self.closure_kind(adjusted_ty).is_none() => {
+                let def_id = def_id.expect_local();
+                let closure_args = args.as_coroutine_closure();
+                let coroutine_closure_sig = self.instantiate_binder_with_fresh_vars(
+                    call_expr.span,
+                    infer::FnCall,
+                    closure_args.coroutine_closure_sig(),
+                );
+                let tupled_upvars_ty = self.next_ty_var(TypeVariableOrigin {
+                    kind: TypeVariableOriginKind::TypeInference,
+                    span: callee_expr.span,
+                });
+                let call_sig = self.tcx.mk_fn_sig(
+                    [coroutine_closure_sig.tupled_inputs_ty],
+                    coroutine_closure_sig.to_coroutine(
+                        self.tcx,
+                        closure_args.parent_args(),
+                        // Inherit the kind ty of the closure, since we're calling this
+                        // coroutine with the most relaxed `AsyncFn*` trait that we can.
+                        // We don't necessarily need to do this here, but it saves us
+                        // computing one more infer var that will get constrained later.
+                        closure_args.kind_ty(),
+                        self.tcx.coroutine_for_closure(def_id),
+                        tupled_upvars_ty,
+                    ),
+                    coroutine_closure_sig.c_variadic,
+                    coroutine_closure_sig.unsafety,
+                    coroutine_closure_sig.abi,
+                );
+                let adjustments = self.adjust_steps(autoderef);
+                self.record_deferred_call_resolution(
+                    def_id,
+                    DeferredCallResolution {
+                        call_expr,
+                        callee_expr,
+                        closure_ty: adjusted_ty,
+                        adjustments,
+                        fn_sig: call_sig,
+                    },
+                );
+                return Some(CallStep::DeferredClosure(def_id, call_sig));
             }
 
             // Hack: we know that there are traits implementing Fn for &F
@@ -886,10 +930,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 pub struct DeferredCallResolution<'tcx> {
     call_expr: &'tcx hir::Expr<'tcx>,
     callee_expr: &'tcx hir::Expr<'tcx>,
-    adjusted_ty: Ty<'tcx>,
+    closure_ty: Ty<'tcx>,
     adjustments: Vec<Adjustment<'tcx>>,
     fn_sig: ty::FnSig<'tcx>,
-    closure_args: GenericArgsRef<'tcx>,
 }
 
 impl<'a, 'tcx> DeferredCallResolution<'tcx> {
@@ -898,10 +941,10 @@ impl<'a, 'tcx> DeferredCallResolution<'tcx> {
 
         // we should not be invoked until the closure kind has been
         // determined by upvar inference
-        assert!(fcx.closure_kind(self.closure_args).is_some());
+        assert!(fcx.closure_kind(self.closure_ty).is_some());
 
         // We may now know enough to figure out fn vs fnmut etc.
-        match fcx.try_overloaded_call_traits(self.call_expr, self.adjusted_ty, None) {
+        match fcx.try_overloaded_call_traits(self.call_expr, self.closure_ty, None) {
             Some((autoref, method_callee)) => {
                 // One problem is that when we get here, we are going
                 // to have a newly instantiated function signature
@@ -937,7 +980,7 @@ impl<'a, 'tcx> DeferredCallResolution<'tcx> {
                 span_bug!(
                     self.call_expr.span,
                     "Expected to find a suitable `Fn`/`FnMut`/`FnOnce` implementation for `{}`",
-                    self.adjusted_ty
+                    self.closure_ty
                 )
             }
         }
diff --git a/compiler/rustc_hir_typeck/src/cast.rs b/compiler/rustc_hir_typeck/src/cast.rs
index a0ac839f3dd2c..58823ea30ce57 100644
--- a/compiler/rustc_hir_typeck/src/cast.rs
+++ b/compiler/rustc_hir_typeck/src/cast.rs
@@ -133,6 +133,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             | ty::FnDef(..)
             | ty::FnPtr(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::Adt(..)
             | ty::Never
diff --git a/compiler/rustc_hir_typeck/src/closure.rs b/compiler/rustc_hir_typeck/src/closure.rs
index f51cc97b45deb..a985fa201d071 100644
--- a/compiler/rustc_hir_typeck/src/closure.rs
+++ b/compiler/rustc_hir_typeck/src/closure.rs
@@ -63,7 +63,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             None => (None, None),
         };
 
-        let ClosureSignatures { bound_sig, liberated_sig } =
+        let ClosureSignatures { bound_sig, mut liberated_sig } =
             self.sig_of_closure(expr_def_id, closure.fn_decl, closure.kind, expected_sig);
 
         debug!(?bound_sig, ?liberated_sig);
@@ -125,7 +125,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen, _)
                     | hir::CoroutineKind::Coroutine(_) => {
                         let yield_ty = self.next_ty_var(TypeVariableOrigin {
-                            kind: TypeVariableOriginKind::TypeInference,
+                            kind: TypeVariableOriginKind::ClosureSynthetic,
                             span: expr_span,
                         });
                         self.require_type_is_sized(yield_ty, expr_span, traits::SizedYieldType);
@@ -137,7 +137,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     // not a problem.
                     hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::AsyncGen, _) => {
                         let yield_ty = self.next_ty_var(TypeVariableOrigin {
-                            kind: TypeVariableOriginKind::TypeInference,
+                            kind: TypeVariableOriginKind::ClosureSynthetic,
                             span: expr_span,
                         });
                         self.require_type_is_sized(yield_ty, expr_span, traits::SizedYieldType);
@@ -166,8 +166,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let resume_ty = liberated_sig.inputs().get(0).copied().unwrap_or(tcx.types.unit);
 
                 let interior = self.next_ty_var(TypeVariableOrigin {
-                    kind: TypeVariableOriginKind::MiscVariable,
-                    span: body.value.span,
+                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                    span: expr_span,
                 });
                 self.deferred_coroutine_interiors.borrow_mut().push((
                     expr_def_id,
@@ -175,10 +175,24 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     interior,
                 ));
 
+                // Coroutines that come from coroutine closures have not yet determined
+                // their kind ty, so make a fresh infer var which will be constrained
+                // later during upvar analysis. Regular coroutines always have the kind
+                // ty of `().`
+                let kind_ty = match kind {
+                    hir::CoroutineKind::Desugared(_, hir::CoroutineSource::Closure) => self
+                        .next_ty_var(TypeVariableOrigin {
+                            kind: TypeVariableOriginKind::ClosureSynthetic,
+                            span: expr_span,
+                        }),
+                    _ => tcx.types.unit,
+                };
+
                 let coroutine_args = ty::CoroutineArgs::new(
                     tcx,
                     ty::CoroutineArgsParts {
                         parent_args,
+                        kind_ty,
                         resume_ty,
                         yield_ty,
                         return_ty: liberated_sig.output(),
@@ -192,6 +206,94 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     Some(CoroutineTypes { resume_ty, yield_ty }),
                 )
             }
+            hir::ClosureKind::CoroutineClosure(kind) => {
+                // async closures always return the type ascribed after the `->` (if present),
+                // and yield `()`.
+                let (bound_return_ty, bound_yield_ty) = match kind {
+                    hir::CoroutineDesugaring::Async => {
+                        (bound_sig.skip_binder().output(), tcx.types.unit)
+                    }
+                    hir::CoroutineDesugaring::Gen | hir::CoroutineDesugaring::AsyncGen => {
+                        todo!("`gen` and `async gen` closures not supported yet")
+                    }
+                };
+                // Compute all of the variables that will be used to populate the coroutine.
+                let resume_ty = self.next_ty_var(TypeVariableOrigin {
+                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                    span: expr_span,
+                });
+                let interior = self.next_ty_var(TypeVariableOrigin {
+                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                    span: expr_span,
+                });
+                let closure_kind_ty = self.next_ty_var(TypeVariableOrigin {
+                    // FIXME(eddyb) distinguish closure kind inference variables from the rest.
+                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                    span: expr_span,
+                });
+                let coroutine_captures_by_ref_ty = self.next_ty_var(TypeVariableOrigin {
+                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                    span: expr_span,
+                });
+                let closure_args = ty::CoroutineClosureArgs::new(
+                    tcx,
+                    ty::CoroutineClosureArgsParts {
+                        parent_args,
+                        closure_kind_ty,
+                        signature_parts_ty: Ty::new_fn_ptr(
+                            tcx,
+                            bound_sig.map_bound(|sig| {
+                                tcx.mk_fn_sig(
+                                    [
+                                        resume_ty,
+                                        Ty::new_tup_from_iter(tcx, sig.inputs().iter().copied()),
+                                    ],
+                                    Ty::new_tup(tcx, &[bound_yield_ty, bound_return_ty]),
+                                    sig.c_variadic,
+                                    sig.unsafety,
+                                    sig.abi,
+                                )
+                            }),
+                        ),
+                        tupled_upvars_ty,
+                        coroutine_captures_by_ref_ty,
+                        coroutine_witness_ty: interior,
+                    },
+                );
+
+                let coroutine_upvars_ty = self.next_ty_var(TypeVariableOrigin {
+                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                    span: expr_span,
+                });
+
+                // We need to turn the liberated signature that we got from HIR, which
+                // looks something like `|Args...| -> T`, into a signature that is suitable
+                // for type checking the inner body of the closure, which always returns a
+                // coroutine. To do so, we use the `CoroutineClosureSignature` to compute
+                // the coroutine type, filling in the tupled_upvars_ty and kind_ty with infer
+                // vars which will get constrained during upvar analysis.
+                let coroutine_output_ty = tcx.liberate_late_bound_regions(
+                    expr_def_id.to_def_id(),
+                    closure_args.coroutine_closure_sig().map_bound(|sig| {
+                        sig.to_coroutine(
+                            tcx,
+                            parent_args,
+                            closure_kind_ty,
+                            tcx.coroutine_for_closure(expr_def_id),
+                            coroutine_upvars_ty,
+                        )
+                    }),
+                );
+                liberated_sig = tcx.mk_fn_sig(
+                    liberated_sig.inputs().iter().copied(),
+                    coroutine_output_ty,
+                    liberated_sig.c_variadic,
+                    liberated_sig.unsafety,
+                    liberated_sig.abi,
+                );
+
+                (Ty::new_coroutine_closure(tcx, expr_def_id.to_def_id(), closure_args.args), None)
+            }
         };
 
         check_fn(
@@ -690,7 +792,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     _,
                 ))
                 | hir::ClosureKind::Coroutine(hir::CoroutineKind::Coroutine(_))
-                | hir::ClosureKind::Closure => astconv.ty_infer(None, decl.output.span()),
+                | hir::ClosureKind::Closure
+                | hir::ClosureKind::CoroutineClosure(_) => {
+                    astconv.ty_infer(None, decl.output.span())
+                }
             },
         };
 
diff --git a/compiler/rustc_hir_typeck/src/method/suggest.rs b/compiler/rustc_hir_typeck/src/method/suggest.rs
index 904961d9eba26..2a1c417a16b9c 100644
--- a/compiler/rustc_hir_typeck/src/method/suggest.rs
+++ b/compiler/rustc_hir_typeck/src/method/suggest.rs
@@ -57,6 +57,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         match ty.kind() {
             // Not all of these (e.g., unsafe fns) implement `FnOnce`,
             // so we look for these beforehand.
+            // FIXME(async_closures): These don't impl `FnOnce` by default.
             ty::Closure(..) | ty::FnDef(..) | ty::FnPtr(_) => true,
             // If it's not a simple function, look for things which implement `FnOnce`.
             _ => {
diff --git a/compiler/rustc_hir_typeck/src/upvar.rs b/compiler/rustc_hir_typeck/src/upvar.rs
index 82c5e566f161c..c4773a885218a 100644
--- a/compiler/rustc_hir_typeck/src/upvar.rs
+++ b/compiler/rustc_hir_typeck/src/upvar.rs
@@ -170,9 +170,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     ) {
         // Extract the type of the closure.
         let ty = self.node_ty(closure_hir_id);
-        let (closure_def_id, args) = match *ty.kind() {
-            ty::Closure(def_id, args) => (def_id, UpvarArgs::Closure(args)),
-            ty::Coroutine(def_id, args) => (def_id, UpvarArgs::Coroutine(args)),
+        let (closure_def_id, args, infer_kind) = match *ty.kind() {
+            ty::Closure(def_id, args) => {
+                (def_id, UpvarArgs::Closure(args), self.closure_kind(ty).is_none())
+            }
+            ty::CoroutineClosure(def_id, args) => {
+                (def_id, UpvarArgs::CoroutineClosure(args), self.closure_kind(ty).is_none())
+            }
+            ty::Coroutine(def_id, args) => (def_id, UpvarArgs::Coroutine(args), false),
             ty::Error(_) => {
                 // #51714: skip analysis when we have already encountered type errors
                 return;
@@ -188,18 +193,63 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         };
         let closure_def_id = closure_def_id.expect_local();
 
-        let infer_kind = if let UpvarArgs::Closure(closure_args) = args {
-            self.closure_kind(closure_args).is_none().then_some(closure_args)
-        } else {
-            None
-        };
-
         assert_eq!(self.tcx.hir().body_owner_def_id(body.id()), closure_def_id);
         let mut delegate = InferBorrowKind {
             closure_def_id,
             capture_information: Default::default(),
             fake_reads: Default::default(),
         };
+
+        // As noted in `lower_coroutine_body_with_moved_arguments`, we default the capture mode
+        // to `ByRef` for the `async {}` block internal to async fns/closure. This means
+        // that we would *not* be moving all of the parameters into the async block by default.
+        //
+        // We force all of these arguments to be captured by move before we do expr use analysis.
+        //
+        // FIXME(async_closures): This could be cleaned up. It's a bit janky that we're just
+        // moving all of the `LocalSource::AsyncFn` locals here.
+        if let Some(hir::CoroutineKind::Desugared(
+            _,
+            hir::CoroutineSource::Fn | hir::CoroutineSource::Closure,
+        )) = self.tcx.coroutine_kind(closure_def_id)
+        {
+            let hir::ExprKind::Block(block, _) = body.value.kind else {
+                bug!();
+            };
+            for stmt in block.stmts {
+                let hir::StmtKind::Local(hir::Local {
+                    init: Some(init),
+                    source: hir::LocalSource::AsyncFn,
+                    pat,
+                    ..
+                }) = stmt.kind
+                else {
+                    bug!();
+                };
+                let hir::PatKind::Binding(hir::BindingAnnotation(hir::ByRef::No, _), _, _, _) =
+                    pat.kind
+                else {
+                    // Complex pattern, skip the non-upvar local.
+                    continue;
+                };
+                let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = init.kind else {
+                    bug!();
+                };
+                let hir::def::Res::Local(local_id) = path.res else {
+                    bug!();
+                };
+                let place = self.place_for_root_variable(closure_def_id, local_id);
+                delegate.capture_information.push((
+                    place,
+                    ty::CaptureInfo {
+                        capture_kind_expr_id: Some(init.hir_id),
+                        path_expr_id: Some(init.hir_id),
+                        capture_kind: UpvarCapture::ByValue,
+                    },
+                ));
+            }
+        }
+
         euv::ExprUseVisitor::new(
             &mut delegate,
             &self.infcx,
@@ -257,10 +307,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         let before_feature_tys = self.final_upvar_tys(closure_def_id);
 
-        if let Some(closure_args) = infer_kind {
+        if infer_kind {
             // Unify the (as yet unbound) type variable in the closure
             // args with the kind we inferred.
-            let closure_kind_ty = closure_args.as_closure().kind_ty();
+            let closure_kind_ty = match args {
+                UpvarArgs::Closure(args) => args.as_closure().kind_ty(),
+                UpvarArgs::CoroutineClosure(args) => args.as_coroutine_closure().kind_ty(),
+                UpvarArgs::Coroutine(_) => unreachable!("coroutines don't have an inferred kind"),
+            };
             self.demand_eqtype(
                 span,
                 Ty::from_closure_kind(self.tcx, closure_kind),
@@ -282,6 +336,84 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
         }
 
+        // For coroutine-closures, we additionally must compute the
+        // `coroutine_captures_by_ref_ty` type, which is used to generate the by-ref
+        // version of the coroutine-closure's output coroutine.
+        if let UpvarArgs::CoroutineClosure(args) = args {
+            let closure_env_region: ty::Region<'_> = ty::Region::new_bound(
+                self.tcx,
+                ty::INNERMOST,
+                ty::BoundRegion {
+                    var: ty::BoundVar::from_usize(0),
+                    kind: ty::BoundRegionKind::BrEnv,
+                },
+            );
+            let tupled_upvars_ty_for_borrow = Ty::new_tup_from_iter(
+                self.tcx,
+                self.typeck_results
+                    .borrow()
+                    .closure_min_captures_flattened(
+                        self.tcx.coroutine_for_closure(closure_def_id).expect_local(),
+                    )
+                    // Skip the captures that are just moving the closure's args
+                    // into the coroutine. These are always by move, and we append
+                    // those later in the `CoroutineClosureSignature` helper functions.
+                    .skip(
+                        args.as_coroutine_closure()
+                            .coroutine_closure_sig()
+                            .skip_binder()
+                            .tupled_inputs_ty
+                            .tuple_fields()
+                            .len(),
+                    )
+                    .map(|captured_place| {
+                        let upvar_ty = captured_place.place.ty();
+                        let capture = captured_place.info.capture_kind;
+                        // Not all upvars are captured by ref, so use
+                        // `apply_capture_kind_on_capture_ty` to ensure that we
+                        // compute the right captured type.
+                        apply_capture_kind_on_capture_ty(
+                            self.tcx,
+                            upvar_ty,
+                            capture,
+                            Some(closure_env_region),
+                        )
+                    }),
+            );
+            let coroutine_captures_by_ref_ty = Ty::new_fn_ptr(
+                self.tcx,
+                ty::Binder::bind_with_vars(
+                    self.tcx.mk_fn_sig(
+                        [],
+                        tupled_upvars_ty_for_borrow,
+                        false,
+                        hir::Unsafety::Normal,
+                        rustc_target::spec::abi::Abi::Rust,
+                    ),
+                    self.tcx.mk_bound_variable_kinds(&[ty::BoundVariableKind::Region(
+                        ty::BoundRegionKind::BrEnv,
+                    )]),
+                ),
+            );
+            self.demand_eqtype(
+                span,
+                args.as_coroutine_closure().coroutine_captures_by_ref_ty(),
+                coroutine_captures_by_ref_ty,
+            );
+
+            // Additionally, we can now constrain the coroutine's kind type.
+            let ty::Coroutine(_, coroutine_args) =
+                *self.typeck_results.borrow().expr_ty(body.value).kind()
+            else {
+                bug!();
+            };
+            self.demand_eqtype(
+                span,
+                coroutine_args.as_coroutine().kind_ty(),
+                Ty::from_closure_kind(self.tcx, closure_kind),
+            );
+        }
+
         self.log_closure_min_capture_info(closure_def_id, span);
 
         // Now that we've analyzed the closure, we know how each
@@ -551,7 +683,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             };
 
             // Go through each entry in the current list of min_captures
-            // - if ancestor is found, update it's capture kind to account for current place's
+            // - if ancestor is found, update its capture kind to account for current place's
             // capture information.
             //
             // - if descendant is found, remove it from the list, and update the current place's
diff --git a/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs b/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs
index e4b37f05b778f..d825a2920eefb 100644
--- a/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs
+++ b/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs
@@ -414,6 +414,7 @@ impl<'cx, 'tcx> TypeFolder<TyCtxt<'tcx>> for Canonicalizer<'cx, 'tcx> {
             }
 
             ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Bool
diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index b8344310d5dfd..cf9d93337839e 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -2839,7 +2839,11 @@ impl<'tcx> ObligationCauseExt<'tcx> for ObligationCause<'tcx> {
             // say, also take a look at the error code, maybe we can
             // tailor to that.
             _ => match terr {
-                TypeError::CyclicTy(ty) if ty.is_closure() || ty.is_coroutine() => Error0644,
+                TypeError::CyclicTy(ty)
+                    if ty.is_closure() || ty.is_coroutine() || ty.is_coroutine_closure() =>
+                {
+                    Error0644
+                }
                 TypeError::IntrinsicCast => Error0308,
                 _ => Error0308,
             },
@@ -2886,7 +2890,9 @@ impl<'tcx> ObligationCauseExt<'tcx> for ObligationCause<'tcx> {
             // say, also take a look at the error code, maybe we can
             // tailor to that.
             _ => match terr {
-                TypeError::CyclicTy(ty) if ty.is_closure() || ty.is_coroutine() => {
+                TypeError::CyclicTy(ty)
+                    if ty.is_closure() || ty.is_coroutine() || ty.is_coroutine_closure() =>
+                {
                     ObligationCauseFailureCode::ClosureSelfref { span }
                 }
                 TypeError::IntrinsicCast => {
diff --git a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
index 7287fc26053fe..c637ab31cd214 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
@@ -883,7 +883,10 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
                 GenericArgKind::Type(ty) => {
                     if matches!(
                         ty.kind(),
-                        ty::Alias(ty::Opaque, ..) | ty::Closure(..) | ty::Coroutine(..)
+                        ty::Alias(ty::Opaque, ..)
+                            | ty::Closure(..)
+                            | ty::CoroutineClosure(..)
+                            | ty::Coroutine(..)
                     ) {
                         // Opaque types can't be named by the user right now.
                         //
diff --git a/compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs b/compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
index 0452d4fe6c806..f884ca83073df 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
@@ -228,7 +228,10 @@ impl<T> Trait<T> for X {
                              #traits-as-parameters",
                         );
                     }
-                    (ty::Param(p), ty::Closure(..) | ty::Coroutine(..)) => {
+                    (
+                        ty::Param(p),
+                        ty::Closure(..) | ty::CoroutineClosure(..) | ty::Coroutine(..),
+                    ) => {
                         let generics = tcx.generics_of(body_owner_def_id);
                         if let Some(param) = generics.opt_type_param(p, tcx) {
                             let p_span = tcx.def_span(param.def_id);
@@ -497,7 +500,7 @@ impl<T> Trait<T> for X {
             }
             CyclicTy(ty) => {
                 // Watch out for various cases of cyclic types and try to explain.
-                if ty.is_closure() || ty.is_coroutine() {
+                if ty.is_closure() || ty.is_coroutine() || ty.is_coroutine_closure() {
                     diag.note(
                         "closures cannot capture themselves or take themselves as argument;\n\
                          this error may be the result of a recent compiler bug-fix,\n\
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index 0a39fe007fd22..101735b2961f0 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -1538,9 +1538,13 @@ impl<'tcx> InferCtxt<'tcx> {
     /// Obtains the latest type of the given closure; this may be a
     /// closure in the current function, in which case its
     /// `ClosureKind` may not yet be known.
-    pub fn closure_kind(&self, closure_args: GenericArgsRef<'tcx>) -> Option<ty::ClosureKind> {
-        let closure_kind_ty = closure_args.as_closure().kind_ty();
-        let closure_kind_ty = self.shallow_resolve(closure_kind_ty);
+    pub fn closure_kind(&self, closure_ty: Ty<'tcx>) -> Option<ty::ClosureKind> {
+        let unresolved_kind_ty = match *closure_ty.kind() {
+            ty::Closure(_, args) => args.as_closure().kind_ty(),
+            ty::CoroutineClosure(_, args) => args.as_coroutine_closure().kind_ty(),
+            _ => bug!("unexpected type {closure_ty}"),
+        };
+        let closure_kind_ty = self.shallow_resolve(unresolved_kind_ty);
         closure_kind_ty.to_opt_closure_kind()
     }
 
diff --git a/compiler/rustc_infer/src/infer/opaque_types.rs b/compiler/rustc_infer/src/infer/opaque_types.rs
index db46b39ce25fc..5ee0a606a5f57 100644
--- a/compiler/rustc_infer/src/infer/opaque_types.rs
+++ b/compiler/rustc_infer/src/infer/opaque_types.rs
@@ -456,6 +456,17 @@ where
                 args.as_closure().sig_as_fn_ptr_ty().visit_with(self);
             }
 
+            ty::CoroutineClosure(_, args) => {
+                // Skip lifetime parameters of the enclosing item(s)
+
+                for upvar in args.as_coroutine_closure().upvar_tys() {
+                    upvar.visit_with(self);
+                }
+
+                // FIXME(async_closures): Is this the right signature to visit here?
+                args.as_coroutine_closure().signature_parts_ty().visit_with(self);
+            }
+
             ty::Coroutine(_, args) => {
                 // Skip lifetime parameters of the enclosing item(s)
                 // Also skip the witness type, because that has no free regions.
diff --git a/compiler/rustc_infer/src/infer/outlives/components.rs b/compiler/rustc_infer/src/infer/outlives/components.rs
index fc3d8375873b0..7dd1ec3254220 100644
--- a/compiler/rustc_infer/src/infer/outlives/components.rs
+++ b/compiler/rustc_infer/src/infer/outlives/components.rs
@@ -103,6 +103,11 @@ fn compute_components<'tcx>(
                 compute_components(tcx, tupled_ty, out, visited);
             }
 
+            ty::CoroutineClosure(_, args) => {
+                let tupled_ty = args.as_coroutine_closure().tupled_upvars_ty();
+                compute_components(tcx, tupled_ty, out, visited);
+            }
+
             ty::Coroutine(_, args) => {
                 // Same as the closure case
                 let tupled_ty = args.as_coroutine().tupled_upvars_ty();
diff --git a/compiler/rustc_lint/src/types.rs b/compiler/rustc_lint/src/types.rs
index e3d3150b36ef4..1205395b8908d 100644
--- a/compiler/rustc_lint/src/types.rs
+++ b/compiler/rustc_lint/src/types.rs
@@ -1435,6 +1435,7 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
             | ty::Bound(..)
             | ty::Error(_)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Placeholder(..)
diff --git a/compiler/rustc_lint/src/unused.rs b/compiler/rustc_lint/src/unused.rs
index ea3747dfac4b3..9f670893b270d 100644
--- a/compiler/rustc_lint/src/unused.rs
+++ b/compiler/rustc_lint/src/unused.rs
@@ -355,7 +355,7 @@ impl<'tcx> LateLintPass<'tcx> for UnusedResults {
                     Some(len) => is_ty_must_use(cx, ty, expr, span)
                         .map(|inner| MustUsePath::Array(Box::new(inner), len)),
                 },
-                ty::Closure(..) => Some(MustUsePath::Closure(span)),
+                ty::Closure(..) | ty::CoroutineClosure(..) => Some(MustUsePath::Closure(span)),
                 ty::Coroutine(def_id, ..) => {
                     // async fn should be treated as "implementor of `Future`"
                     let must_use = if cx.tcx.coroutine_is_async(def_id) {
diff --git a/compiler/rustc_middle/src/middle/lang_items.rs b/compiler/rustc_middle/src/middle/lang_items.rs
index f92c72c8a588c..a4e193ba2c942 100644
--- a/compiler/rustc_middle/src/middle/lang_items.rs
+++ b/compiler/rustc_middle/src/middle/lang_items.rs
@@ -23,7 +23,7 @@ impl<'tcx> TyCtxt<'tcx> {
         })
     }
 
-    /// Given a [`DefId`] of a [`Fn`], [`FnMut`] or [`FnOnce`] traits,
+    /// Given a [`DefId`] of one of the [`Fn`], [`FnMut`] or [`FnOnce`] traits,
     /// returns a corresponding [`ty::ClosureKind`].
     /// For any other [`DefId`] return `None`.
     pub fn fn_trait_kind_from_def_id(self, id: DefId) -> Option<ty::ClosureKind> {
@@ -36,6 +36,19 @@ impl<'tcx> TyCtxt<'tcx> {
         }
     }
 
+    /// Given a [`DefId`] of one of the `AsyncFn`, `AsyncFnMut` or `AsyncFnOnce` traits,
+    /// returns a corresponding [`ty::ClosureKind`].
+    /// For any other [`DefId`] return `None`.
+    pub fn async_fn_trait_kind_from_def_id(self, id: DefId) -> Option<ty::ClosureKind> {
+        let items = self.lang_items();
+        match Some(id) {
+            x if x == items.async_fn_trait() => Some(ty::ClosureKind::Fn),
+            x if x == items.async_fn_mut_trait() => Some(ty::ClosureKind::FnMut),
+            x if x == items.async_fn_once_trait() => Some(ty::ClosureKind::FnOnce),
+            _ => None,
+        }
+    }
+
     /// Given a [`ty::ClosureKind`], get the [`DefId`] of its corresponding `Fn`-family
     /// trait, if it is defined.
     pub fn fn_trait_kind_to_def_id(self, kind: ty::ClosureKind) -> Option<DefId> {
diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index c9e69253701c5..9475b89aa15c2 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -262,6 +262,25 @@ pub struct CoroutineInfo<'tcx> {
     /// Coroutine drop glue. This field is populated after the state transform pass.
     pub coroutine_drop: Option<Body<'tcx>>,
 
+    /// The body of the coroutine, modified to take its upvars by move rather than by ref.
+    ///
+    /// This is used by coroutine-closures, which must return a different flavor of coroutine
+    /// when called using `AsyncFnOnce::call_once`. It is produced by the `ByMoveBody` pass which
+    /// is run right after building the initial MIR, and will only be populated for coroutines
+    /// which come out of the async closure desugaring.
+    ///
+    /// This body should be processed in lockstep with the containing body -- any optimization
+    /// passes, etc, should be applied to this body as well. This is done automatically if
+    /// using `run_passes`.
+    pub by_move_body: Option<Body<'tcx>>,
+
+    /// The body of the coroutine, modified to take its upvars by mutable ref rather than by
+    /// immutable ref.
+    ///
+    /// FIXME(async_closures): This is literally the same body as the parent body. Find a better
+    /// way to represent the by-mut signature (or cap the closure-kind of the coroutine).
+    pub by_mut_body: Option<Body<'tcx>>,
+
     /// The layout of a coroutine. This field is populated after the state transform pass.
     pub coroutine_layout: Option<CoroutineLayout<'tcx>>,
 
@@ -281,6 +300,8 @@ impl<'tcx> CoroutineInfo<'tcx> {
             coroutine_kind,
             yield_ty: Some(yield_ty),
             resume_ty: Some(resume_ty),
+            by_move_body: None,
+            by_mut_body: None,
             coroutine_drop: None,
             coroutine_layout: None,
         }
@@ -591,6 +612,14 @@ impl<'tcx> Body<'tcx> {
         self.coroutine.as_ref().and_then(|coroutine| coroutine.coroutine_drop.as_ref())
     }
 
+    pub fn coroutine_by_move_body(&self) -> Option<&Body<'tcx>> {
+        self.coroutine.as_ref()?.by_move_body.as_ref()
+    }
+
+    pub fn coroutine_by_mut_body(&self) -> Option<&Body<'tcx>> {
+        self.coroutine.as_ref()?.by_mut_body.as_ref()
+    }
+
     #[inline]
     pub fn coroutine_kind(&self) -> Option<CoroutineKind> {
         self.coroutine.as_ref().map(|coroutine| coroutine.coroutine_kind)
diff --git a/compiler/rustc_middle/src/mir/mono.rs b/compiler/rustc_middle/src/mir/mono.rs
index 91fdf0b312991..6937df7bb1897 100644
--- a/compiler/rustc_middle/src/mir/mono.rs
+++ b/compiler/rustc_middle/src/mir/mono.rs
@@ -402,6 +402,8 @@ impl<'tcx> CodegenUnit<'tcx> {
                             | InstanceDef::FnPtrShim(..)
                             | InstanceDef::Virtual(..)
                             | InstanceDef::ClosureOnceShim { .. }
+                            | InstanceDef::ConstructCoroutineInClosureShim { .. }
+                            | InstanceDef::CoroutineKindShim { .. }
                             | InstanceDef::DropGlue(..)
                             | InstanceDef::CloneShim(..)
                             | InstanceDef::ThreadLocalShim(..)
diff --git a/compiler/rustc_middle/src/mir/pretty.rs b/compiler/rustc_middle/src/mir/pretty.rs
index 3b60eba2dfe0a..6f587fdd53c61 100644
--- a/compiler/rustc_middle/src/mir/pretty.rs
+++ b/compiler/rustc_middle/src/mir/pretty.rs
@@ -990,7 +990,8 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                         })
                     }
 
-                    AggregateKind::Closure(def_id, args) => ty::tls::with(|tcx| {
+                    AggregateKind::Closure(def_id, args)
+                    | AggregateKind::CoroutineClosure(def_id, args) => ty::tls::with(|tcx| {
                         let name = if tcx.sess.opts.unstable_opts.span_free_formats {
                             let args = tcx.lift(args).unwrap();
                             format!("{{closure@{}}}", tcx.def_path_str_with_args(def_id, args),)
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs
index a4b6c4f9c3f19..ca56e1fd92c6b 100644
--- a/compiler/rustc_middle/src/mir/syntax.rs
+++ b/compiler/rustc_middle/src/mir/syntax.rs
@@ -1350,6 +1350,7 @@ pub enum AggregateKind<'tcx> {
 
     Closure(DefId, GenericArgsRef<'tcx>),
     Coroutine(DefId, GenericArgsRef<'tcx>),
+    CoroutineClosure(DefId, GenericArgsRef<'tcx>),
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable)]
diff --git a/compiler/rustc_middle/src/mir/tcx.rs b/compiler/rustc_middle/src/mir/tcx.rs
index 5597609c7d796..4780042a51090 100644
--- a/compiler/rustc_middle/src/mir/tcx.rs
+++ b/compiler/rustc_middle/src/mir/tcx.rs
@@ -202,6 +202,9 @@ impl<'tcx> Rvalue<'tcx> {
                 AggregateKind::Adt(did, _, args, _, _) => tcx.type_of(did).instantiate(tcx, args),
                 AggregateKind::Closure(did, args) => Ty::new_closure(tcx, did, args),
                 AggregateKind::Coroutine(did, args) => Ty::new_coroutine(tcx, did, args),
+                AggregateKind::CoroutineClosure(did, args) => {
+                    Ty::new_coroutine_closure(tcx, did, args)
+                }
             },
             Rvalue::ShallowInitBox(_, ty) => Ty::new_box(tcx, ty),
             Rvalue::CopyForDeref(ref place) => place.ty(local_decls, tcx).ty,
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
index 4696f54c89787..2c5ca82a4cd39 100644
--- a/compiler/rustc_middle/src/mir/visit.rs
+++ b/compiler/rustc_middle/src/mir/visit.rs
@@ -345,6 +345,8 @@ macro_rules! make_mir_visitor {
                         ty::InstanceDef::Virtual(_def_id, _) |
                         ty::InstanceDef::ThreadLocalShim(_def_id) |
                         ty::InstanceDef::ClosureOnceShim { call_once: _def_id, track_caller: _ } |
+                        ty::InstanceDef::ConstructCoroutineInClosureShim { coroutine_closure_def_id: _def_id, target_kind: _ } |
+                        ty::InstanceDef::CoroutineKindShim { coroutine_def_id: _def_id, target_kind: _ } |
                         ty::InstanceDef::DropGlue(_def_id, None) => {}
 
                         ty::InstanceDef::FnPtrShim(_def_id, ty) |
@@ -739,6 +741,12 @@ macro_rules! make_mir_visitor {
                             ) => {
                                 self.visit_args(coroutine_args, location);
                             }
+                            AggregateKind::CoroutineClosure(
+                                _,
+                                coroutine_closure_args,
+                            ) => {
+                                self.visit_args(coroutine_closure_args, location);
+                            }
                         }
 
                         for operand in operands {
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 2438f826441d2..938fba0ed0981 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -755,6 +755,11 @@ rustc_queries! {
         separate_provide_extern
     }
 
+    query coroutine_for_closure(def_id: DefId) -> DefId {
+        desc { |_tcx| "Given a coroutine-closure def id, return the def id of the coroutine returned by it" }
+        separate_provide_extern
+    }
+
     /// Gets a map with the variance of every item; use `variances_of` instead.
     query crate_variances(_: ()) -> &'tcx ty::CrateVariancesMap<'tcx> {
         arena_cache
diff --git a/compiler/rustc_middle/src/traits/select.rs b/compiler/rustc_middle/src/traits/select.rs
index 64f4af08e12ed..28eba133c76df 100644
--- a/compiler/rustc_middle/src/traits/select.rs
+++ b/compiler/rustc_middle/src/traits/select.rs
@@ -134,6 +134,15 @@ pub enum SelectionCandidate<'tcx> {
         is_const: bool,
     },
 
+    /// Implementation of an `AsyncFn`-family trait by one of the anonymous types
+    /// generated for an `async ||` expression.
+    AsyncClosureCandidate,
+
+    /// Implementation of the the `AsyncFnKindHelper` helper trait, which
+    /// is used internally to delay computation for async closures until after
+    /// upvar analysis is performed in HIR typeck.
+    AsyncFnKindHelperCandidate,
+
     /// Implementation of a `Coroutine` trait by one of the anonymous types
     /// generated for a coroutine.
     CoroutineCandidate,
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 0d53870a0baf0..14d2a93e16714 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -1544,6 +1544,7 @@ impl<'tcx> TyCtxt<'tcx> {
                     CoroutineWitness,
                     Dynamic,
                     Closure,
+                    CoroutineClosure,
                     Tuple,
                     Bound,
                     Param,
diff --git a/compiler/rustc_middle/src/ty/error.rs b/compiler/rustc_middle/src/ty/error.rs
index 0e44878524bf0..80b763d1469e4 100644
--- a/compiler/rustc_middle/src/ty/error.rs
+++ b/compiler/rustc_middle/src/ty/error.rs
@@ -299,7 +299,7 @@ impl<'tcx> Ty<'tcx> {
             },
             ty::FnPtr(_) => "fn pointer".into(),
             ty::Dynamic(..) => "trait object".into(),
-            ty::Closure(..) => "closure".into(),
+            ty::Closure(..) | ty::CoroutineClosure(..) => "closure".into(),
             ty::Coroutine(def_id, ..) => {
                 format!("{:#}", tcx.coroutine_kind(def_id).unwrap()).into()
             }
diff --git a/compiler/rustc_middle/src/ty/fast_reject.rs b/compiler/rustc_middle/src/ty/fast_reject.rs
index b71919adc58fa..adc153c4dfd2d 100644
--- a/compiler/rustc_middle/src/ty/fast_reject.rs
+++ b/compiler/rustc_middle/src/ty/fast_reject.rs
@@ -128,7 +128,9 @@ pub fn simplify_type<'tcx>(
             _ => Some(SimplifiedType::MarkerTraitObject),
         },
         ty::Ref(_, _, mutbl) => Some(SimplifiedType::Ref(mutbl)),
-        ty::FnDef(def_id, _) | ty::Closure(def_id, _) => Some(SimplifiedType::Closure(def_id)),
+        ty::FnDef(def_id, _) | ty::Closure(def_id, _) | ty::CoroutineClosure(def_id, _) => {
+            Some(SimplifiedType::Closure(def_id))
+        }
         ty::Coroutine(def_id, _) => Some(SimplifiedType::Coroutine(def_id)),
         ty::CoroutineWitness(def_id, _) => Some(SimplifiedType::CoroutineWitness(def_id)),
         ty::Never => Some(SimplifiedType::Never),
@@ -236,6 +238,7 @@ impl DeepRejectCtxt {
             | ty::Foreign(..) => debug_assert!(impl_ty.is_known_rigid()),
             ty::FnDef(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Placeholder(..)
@@ -312,7 +315,7 @@ impl DeepRejectCtxt {
             },
 
             // Impls cannot contain these types as these cannot be named directly.
-            ty::FnDef(..) | ty::Closure(..) | ty::Coroutine(..) => false,
+            ty::FnDef(..) | ty::Closure(..) | ty::CoroutineClosure(..) | ty::Coroutine(..) => false,
 
             // Placeholder types don't unify with anything on their own
             ty::Placeholder(..) | ty::Bound(..) => false,
diff --git a/compiler/rustc_middle/src/ty/flags.rs b/compiler/rustc_middle/src/ty/flags.rs
index 0c1d10914146f..0f4b5fe228c96 100644
--- a/compiler/rustc_middle/src/ty/flags.rs
+++ b/compiler/rustc_middle/src/ty/flags.rs
@@ -136,6 +136,22 @@ impl FlagComputation {
                 self.add_ty(args.tupled_upvars_ty());
             }
 
+            &ty::CoroutineClosure(_, args) => {
+                let args = args.as_coroutine_closure();
+                let should_remove_further_specializable =
+                    !self.flags.contains(TypeFlags::STILL_FURTHER_SPECIALIZABLE);
+                self.add_args(args.parent_args());
+                if should_remove_further_specializable {
+                    self.flags -= TypeFlags::STILL_FURTHER_SPECIALIZABLE;
+                }
+
+                self.add_ty(args.kind_ty());
+                self.add_ty(args.signature_parts_ty());
+                self.add_ty(args.tupled_upvars_ty());
+                self.add_ty(args.coroutine_captures_by_ref_ty());
+                self.add_ty(args.coroutine_witness_ty());
+            }
+
             &ty::Bound(debruijn, _) => {
                 self.add_bound_var(debruijn);
                 self.add_flags(TypeFlags::HAS_TY_BOUND);
diff --git a/compiler/rustc_middle/src/ty/generic_args.rs b/compiler/rustc_middle/src/ty/generic_args.rs
index 69ad6810c6fe0..b9fff660a03b9 100644
--- a/compiler/rustc_middle/src/ty/generic_args.rs
+++ b/compiler/rustc_middle/src/ty/generic_args.rs
@@ -2,7 +2,7 @@
 
 use crate::ty::codec::{TyDecoder, TyEncoder};
 use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable};
-use crate::ty::sty::{ClosureArgs, CoroutineArgs, InlineConstArgs};
+use crate::ty::sty::{ClosureArgs, CoroutineArgs, CoroutineClosureArgs, InlineConstArgs};
 use crate::ty::visit::{TypeVisitable, TypeVisitableExt, TypeVisitor};
 use crate::ty::{self, Lift, List, ParamConst, Ty, TyCtxt};
 
@@ -288,6 +288,14 @@ impl<'tcx> GenericArgs<'tcx> {
         ClosureArgs { args: self }
     }
 
+    /// Interpret these generic args as the args of a coroutine-closure type.
+    /// Coroutine-closure args have a particular structure controlled by the
+    /// compiler that encodes information like the signature and closure kind;
+    /// see `ty::CoroutineClosureArgs` struct for more comments.
+    pub fn as_coroutine_closure(&'tcx self) -> CoroutineClosureArgs<'tcx> {
+        CoroutineClosureArgs { args: self }
+    }
+
     /// Interpret these generic args as the args of a coroutine type.
     /// Coroutine args have a particular structure controlled by the
     /// compiler that encodes information like the signature and coroutine kind;
diff --git a/compiler/rustc_middle/src/ty/instance.rs b/compiler/rustc_middle/src/ty/instance.rs
index 293fdb026b685..9c1f4b20d2c83 100644
--- a/compiler/rustc_middle/src/ty/instance.rs
+++ b/compiler/rustc_middle/src/ty/instance.rs
@@ -82,11 +82,33 @@ pub enum InstanceDef<'tcx> {
     /// details on that).
     Virtual(DefId, usize),
 
-    /// `<[FnMut closure] as FnOnce>::call_once`.
+    /// `<[FnMut/Fn closure] as FnOnce>::call_once`.
     ///
     /// The `DefId` is the ID of the `call_once` method in `FnOnce`.
+    ///
+    /// This generates a body that will just borrow the (owned) self type,
+    /// and dispatch to the `FnMut::call_mut` instance for the closure.
     ClosureOnceShim { call_once: DefId, track_caller: bool },
 
+    /// `<[FnMut/Fn coroutine-closure] as FnOnce>::call_once` or
+    /// `<[Fn coroutine-closure] as FnMut>::call_mut`.
+    ///
+    /// The body generated here differs significantly from the `ClosureOnceShim`,
+    /// since we need to generate a distinct coroutine type that will move the
+    /// closure's upvars *out* of the closure.
+    ConstructCoroutineInClosureShim {
+        coroutine_closure_def_id: DefId,
+        target_kind: ty::ClosureKind,
+    },
+
+    /// `<[coroutine] as Future>::poll`, but for coroutines produced when `AsyncFnOnce`
+    /// is called on a coroutine-closure whose closure kind greater than `FnOnce`, or
+    /// similarly for `AsyncFnMut`.
+    ///
+    /// This will select the body that is produced by the `ByMoveBody` transform, and thus
+    /// take and use all of its upvars by-move rather than by-ref.
+    CoroutineKindShim { coroutine_def_id: DefId, target_kind: ty::ClosureKind },
+
     /// Compiler-generated accessor for thread locals which returns a reference to the thread local
     /// the `DefId` defines. This is used to export thread locals from dylibs on platforms lacking
     /// native support.
@@ -168,6 +190,11 @@ impl<'tcx> InstanceDef<'tcx> {
             | InstanceDef::Intrinsic(def_id)
             | InstanceDef::ThreadLocalShim(def_id)
             | InstanceDef::ClosureOnceShim { call_once: def_id, track_caller: _ }
+            | ty::InstanceDef::ConstructCoroutineInClosureShim {
+                coroutine_closure_def_id: def_id,
+                target_kind: _,
+            }
+            | ty::InstanceDef::CoroutineKindShim { coroutine_def_id: def_id, target_kind: _ }
             | InstanceDef::DropGlue(def_id, _)
             | InstanceDef::CloneShim(def_id, _)
             | InstanceDef::FnPtrAddrShim(def_id, _) => def_id,
@@ -187,6 +214,8 @@ impl<'tcx> InstanceDef<'tcx> {
             | InstanceDef::Virtual(..)
             | InstanceDef::Intrinsic(..)
             | InstanceDef::ClosureOnceShim { .. }
+            | ty::InstanceDef::ConstructCoroutineInClosureShim { .. }
+            | ty::InstanceDef::CoroutineKindShim { .. }
             | InstanceDef::DropGlue(..)
             | InstanceDef::CloneShim(..)
             | InstanceDef::FnPtrAddrShim(..) => None,
@@ -282,6 +311,8 @@ impl<'tcx> InstanceDef<'tcx> {
             | InstanceDef::FnPtrShim(..)
             | InstanceDef::DropGlue(_, Some(_)) => false,
             InstanceDef::ClosureOnceShim { .. }
+            | InstanceDef::ConstructCoroutineInClosureShim { .. }
+            | InstanceDef::CoroutineKindShim { .. }
             | InstanceDef::DropGlue(..)
             | InstanceDef::Item(_)
             | InstanceDef::Intrinsic(..)
@@ -319,6 +350,8 @@ fn fmt_instance(
         InstanceDef::Virtual(_, num) => write!(f, " - virtual#{num}"),
         InstanceDef::FnPtrShim(_, ty) => write!(f, " - shim({ty})"),
         InstanceDef::ClosureOnceShim { .. } => write!(f, " - shim"),
+        InstanceDef::ConstructCoroutineInClosureShim { .. } => write!(f, " - shim"),
+        InstanceDef::CoroutineKindShim { .. } => write!(f, " - shim"),
         InstanceDef::DropGlue(_, None) => write!(f, " - shim(None)"),
         InstanceDef::DropGlue(_, Some(ty)) => write!(f, " - shim(Some({ty}))"),
         InstanceDef::CloneShim(_, ty) => write!(f, " - shim({ty})"),
@@ -610,7 +643,24 @@ impl<'tcx> Instance<'tcx> {
         };
 
         if tcx.lang_items().get(coroutine_callable_item) == Some(trait_item_id) {
-            Some(Instance { def: ty::InstanceDef::Item(coroutine_def_id), args: args })
+            let ty::Coroutine(_, id_args) = *tcx.type_of(coroutine_def_id).skip_binder().kind()
+            else {
+                bug!()
+            };
+
+            // If the closure's kind ty disagrees with the identity closure's kind ty,
+            // then this must be a coroutine generated by one of the `ConstructCoroutineInClosureShim`s.
+            if args.as_coroutine().kind_ty() == id_args.as_coroutine().kind_ty() {
+                Some(Instance { def: ty::InstanceDef::Item(coroutine_def_id), args })
+            } else {
+                Some(Instance {
+                    def: ty::InstanceDef::CoroutineKindShim {
+                        coroutine_def_id,
+                        target_kind: args.as_coroutine().kind_ty().to_opt_closure_kind().unwrap(),
+                    },
+                    args,
+                })
+            }
         } else {
             // All other methods should be defaulted methods of the built-in trait.
             // This is important for `Iterator`'s combinators, but also useful for
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index 73b0e324f13ca..8d8d06b7c0b7f 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -906,6 +906,12 @@ where
                     i,
                 ),
 
+                ty::CoroutineClosure(_, args) => field_ty_or_layout(
+                    TyAndLayout { ty: args.as_coroutine_closure().tupled_upvars_ty(), ..this },
+                    cx,
+                    i,
+                ),
+
                 ty::Coroutine(def_id, args) => match this.variants {
                     Variants::Single { index } => TyMaybeWithLayout::Ty(
                         args.as_coroutine()
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 8e51db82f95ae..c9137f374a238 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -105,9 +105,10 @@ pub use self::region::{
 pub use self::rvalue_scopes::RvalueScopes;
 pub use self::sty::{
     AliasTy, Article, Binder, BoundTy, BoundTyKind, BoundVariableKind, CanonicalPolyFnSig,
-    ClosureArgs, ClosureArgsParts, CoroutineArgs, CoroutineArgsParts, FnSig, GenSig,
-    InlineConstArgs, InlineConstArgsParts, ParamConst, ParamTy, PolyFnSig, TyKind, TypeAndMut,
-    UpvarArgs, VarianceDiagInfo,
+    ClosureArgs, ClosureArgsParts, CoroutineArgs, CoroutineArgsParts, CoroutineClosureArgs,
+    CoroutineClosureArgsParts, CoroutineClosureSignature, FnSig, GenSig, InlineConstArgs,
+    InlineConstArgsParts, ParamConst, ParamTy, PolyFnSig, TyKind, TypeAndMut, UpvarArgs,
+    VarianceDiagInfo,
 };
 pub use self::trait_def::TraitDef;
 pub use self::typeck_results::{
@@ -1679,6 +1680,8 @@ impl<'tcx> TyCtxt<'tcx> {
             | ty::InstanceDef::FnPtrShim(..)
             | ty::InstanceDef::Virtual(..)
             | ty::InstanceDef::ClosureOnceShim { .. }
+            | ty::InstanceDef::ConstructCoroutineInClosureShim { .. }
+            | ty::InstanceDef::CoroutineKindShim { .. }
             | ty::InstanceDef::DropGlue(..)
             | ty::InstanceDef::CloneShim(..)
             | ty::InstanceDef::ThreadLocalShim(..)
diff --git a/compiler/rustc_middle/src/ty/print/mod.rs b/compiler/rustc_middle/src/ty/print/mod.rs
index f32b7b0852abc..19f8ba124f143 100644
--- a/compiler/rustc_middle/src/ty/print/mod.rs
+++ b/compiler/rustc_middle/src/ty/print/mod.rs
@@ -3,6 +3,7 @@ use crate::ty::{self, Ty, TyCtxt};
 
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::sso::SsoHashSet;
+use rustc_hir as hir;
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId};
 use rustc_hir::definitions::{DefPathData, DisambiguatedDefPathData};
 
@@ -130,8 +131,24 @@ pub trait Printer<'tcx>: Sized {
                     parent_args = &args[..generics.parent_count.min(args.len())];
 
                     match key.disambiguated_data.data {
-                        // Closures' own generics are only captures, don't print them.
-                        DefPathData::Closure => {}
+                        DefPathData::Closure => {
+                            // FIXME(async_closures): This is somewhat ugly.
+                            // We need to additionally print the `kind` field of a closure if
+                            // it is desugared from a coroutine-closure.
+                            if let Some(hir::CoroutineKind::Desugared(
+                                _,
+                                hir::CoroutineSource::Closure,
+                            )) = self.tcx().coroutine_kind(def_id)
+                                && args.len() >= parent_args.len() + 1
+                            {
+                                return self.path_generic_args(
+                                    |cx| cx.print_def_path(def_id, parent_args),
+                                    &args[..parent_args.len() + 1][..1],
+                                );
+                            } else {
+                                // Closures' own generics are only captures, don't print them.
+                            }
+                        }
                         // This covers both `DefKind::AnonConst` and `DefKind::InlineConst`.
                         // Anon consts doesn't have their own generics, and inline consts' own
                         // generics are their inferred types, so don't print them.
@@ -259,6 +276,7 @@ fn characteristic_def_id_of_type_cached<'a>(
 
         ty::FnDef(def_id, _)
         | ty::Closure(def_id, _)
+        | ty::CoroutineClosure(def_id, _)
         | ty::Coroutine(def_id, _)
         | ty::CoroutineWitness(def_id, _)
         | ty::Foreign(def_id) => Some(def_id),
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index bac5068a69b86..c0bfd2380ade0 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -874,6 +874,48 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
                 }
                 p!("}}");
             }
+            ty::CoroutineClosure(did, args) => {
+                p!(write("{{"));
+                if !self.should_print_verbose() {
+                    p!(write("coroutine-closure"));
+                    // FIXME(eddyb) should use `def_span`.
+                    if let Some(did) = did.as_local() {
+                        if self.tcx().sess.opts.unstable_opts.span_free_formats {
+                            p!("@", print_def_path(did.to_def_id(), args));
+                        } else {
+                            let span = self.tcx().def_span(did);
+                            let preference = if with_forced_trimmed_paths() {
+                                FileNameDisplayPreference::Short
+                            } else {
+                                FileNameDisplayPreference::Remapped
+                            };
+                            p!(write(
+                                "@{}",
+                                // This may end up in stderr diagnostics but it may also be emitted
+                                // into MIR. Hence we use the remapped path if available
+                                self.tcx().sess.source_map().span_to_string(span, preference)
+                            ));
+                        }
+                    } else {
+                        p!(write("@"), print_def_path(did, args));
+                    }
+                } else {
+                    p!(print_def_path(did, args));
+                    p!(
+                        " closure_kind_ty=",
+                        print(args.as_coroutine_closure().kind_ty()),
+                        " signature_parts_ty=",
+                        print(args.as_coroutine_closure().signature_parts_ty()),
+                        " upvar_tys=",
+                        print(args.as_coroutine_closure().tupled_upvars_ty()),
+                        " coroutine_captures_by_ref_ty=",
+                        print(args.as_coroutine_closure().coroutine_captures_by_ref_ty()),
+                        " coroutine_witness_ty=",
+                        print(args.as_coroutine_closure().coroutine_witness_ty())
+                    );
+                }
+                p!("}}");
+            }
             ty::Array(ty, sz) => p!("[", print(ty), "; ", print(sz), "]"),
             ty::Slice(ty) => p!("[", print(ty), "]"),
         }
diff --git a/compiler/rustc_middle/src/ty/relate.rs b/compiler/rustc_middle/src/ty/relate.rs
index 8543bd0bbdd96..f2321e7e1d22f 100644
--- a/compiler/rustc_middle/src/ty/relate.rs
+++ b/compiler/rustc_middle/src/ty/relate.rs
@@ -481,6 +481,13 @@ pub fn structurally_relate_tys<'tcx, R: TypeRelation<'tcx>>(
             Ok(Ty::new_closure(tcx, a_id, args))
         }
 
+        (&ty::CoroutineClosure(a_id, a_args), &ty::CoroutineClosure(b_id, b_args))
+            if a_id == b_id =>
+        {
+            let args = relate_args_invariantly(relation, a_args, b_args)?;
+            Ok(Ty::new_coroutine_closure(tcx, a_id, args))
+        }
+
         (&ty::RawPtr(a_mt), &ty::RawPtr(b_mt)) => {
             let mt = relate_type_and_mut(relation, a_mt, b_mt, a)?;
             Ok(Ty::new_ptr(tcx, mt))
diff --git a/compiler/rustc_middle/src/ty/structural_impls.rs b/compiler/rustc_middle/src/ty/structural_impls.rs
index 11b579a1f85b6..c6805ba932357 100644
--- a/compiler/rustc_middle/src/ty/structural_impls.rs
+++ b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -584,6 +584,9 @@ impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for Ty<'tcx> {
                 ty::CoroutineWitness(did, args.try_fold_with(folder)?)
             }
             ty::Closure(did, args) => ty::Closure(did, args.try_fold_with(folder)?),
+            ty::CoroutineClosure(did, args) => {
+                ty::CoroutineClosure(did, args.try_fold_with(folder)?)
+            }
             ty::Alias(kind, data) => ty::Alias(kind, data.try_fold_with(folder)?),
 
             ty::Bool
@@ -632,6 +635,7 @@ impl<'tcx> TypeSuperVisitable<TyCtxt<'tcx>> for Ty<'tcx> {
             ty::Coroutine(_did, ref args) => args.visit_with(visitor),
             ty::CoroutineWitness(_did, ref args) => args.visit_with(visitor),
             ty::Closure(_did, ref args) => args.visit_with(visitor),
+            ty::CoroutineClosure(_did, ref args) => args.visit_with(visitor),
             ty::Alias(_, ref data) => data.visit_with(visitor),
 
             ty::Bool
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index f5fdf210592e8..927924452f913 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -36,6 +36,7 @@ use rustc_type_ir::TyKind as IrTyKind;
 use rustc_type_ir::TyKind::*;
 use rustc_type_ir::TypeAndMut as IrTypeAndMut;
 
+use super::fold::FnMutDelegate;
 use super::GenericParamDefKind;
 
 // Re-export and re-parameterize some `I = TyCtxt<'tcx>` types here
@@ -269,6 +270,275 @@ impl<'tcx> ClosureArgs<'tcx> {
     }
 }
 
+#[derive(Copy, Clone, PartialEq, Eq, Debug, TypeFoldable, TypeVisitable, Lift)]
+pub struct CoroutineClosureArgs<'tcx> {
+    pub args: GenericArgsRef<'tcx>,
+}
+
+/// See docs for explanation of how each argument is used.
+///
+/// See [`CoroutineClosureSignature`] for how these arguments are put together
+/// to make a callable [`FnSig`] suitable for typeck and borrowck.
+pub struct CoroutineClosureArgsParts<'tcx> {
+    /// This is the args of the typeck root.
+    pub parent_args: &'tcx [GenericArg<'tcx>],
+    /// Represents the maximum calling capability of the closure.
+    pub closure_kind_ty: Ty<'tcx>,
+    /// Represents all of the relevant parts of the coroutine returned by this
+    /// coroutine-closure. This signature parts type will have the general
+    /// shape of `fn(tupled_inputs, resume_ty) -> (return_ty, yield_ty)`, where
+    /// `resume_ty`, `return_ty`, and `yield_ty` are the respective types for the
+    /// coroutine returned by the coroutine-closure.
+    ///
+    /// Use `coroutine_closure_sig` to break up this type rather than using it
+    /// yourself.
+    pub signature_parts_ty: Ty<'tcx>,
+    /// The upvars captured by the closure. Remains an inference variable
+    /// until the upvar analysis, which happens late in HIR typeck.
+    pub tupled_upvars_ty: Ty<'tcx>,
+    /// a function pointer that has the shape `for<'env> fn() -> (&'env T, ...)`.
+    /// This allows us to represent the binder of the self-captures of the closure.
+    ///
+    /// For example, if the coroutine returned by the closure borrows `String`
+    /// from the closure's upvars, this will be `for<'env> fn() -> (&'env String,)`,
+    /// while the `tupled_upvars_ty`, representing the by-move version of the same
+    /// captures, will be `(String,)`.
+    pub coroutine_captures_by_ref_ty: Ty<'tcx>,
+    /// Witness type returned by the generator produced by this coroutine-closure.
+    pub coroutine_witness_ty: Ty<'tcx>,
+}
+
+impl<'tcx> CoroutineClosureArgs<'tcx> {
+    pub fn new(
+        tcx: TyCtxt<'tcx>,
+        parts: CoroutineClosureArgsParts<'tcx>,
+    ) -> CoroutineClosureArgs<'tcx> {
+        CoroutineClosureArgs {
+            args: tcx.mk_args_from_iter(parts.parent_args.iter().copied().chain([
+                parts.closure_kind_ty.into(),
+                parts.signature_parts_ty.into(),
+                parts.tupled_upvars_ty.into(),
+                parts.coroutine_captures_by_ref_ty.into(),
+                parts.coroutine_witness_ty.into(),
+            ])),
+        }
+    }
+
+    fn split(self) -> CoroutineClosureArgsParts<'tcx> {
+        match self.args[..] {
+            [
+                ref parent_args @ ..,
+                closure_kind_ty,
+                signature_parts_ty,
+                tupled_upvars_ty,
+                coroutine_captures_by_ref_ty,
+                coroutine_witness_ty,
+            ] => CoroutineClosureArgsParts {
+                parent_args,
+                closure_kind_ty: closure_kind_ty.expect_ty(),
+                signature_parts_ty: signature_parts_ty.expect_ty(),
+                tupled_upvars_ty: tupled_upvars_ty.expect_ty(),
+                coroutine_captures_by_ref_ty: coroutine_captures_by_ref_ty.expect_ty(),
+                coroutine_witness_ty: coroutine_witness_ty.expect_ty(),
+            },
+            _ => bug!("closure args missing synthetics"),
+        }
+    }
+
+    pub fn parent_args(self) -> &'tcx [GenericArg<'tcx>] {
+        self.split().parent_args
+    }
+
+    #[inline]
+    pub fn upvar_tys(self) -> &'tcx List<Ty<'tcx>> {
+        match self.tupled_upvars_ty().kind() {
+            TyKind::Error(_) => ty::List::empty(),
+            TyKind::Tuple(..) => self.tupled_upvars_ty().tuple_fields(),
+            TyKind::Infer(_) => bug!("upvar_tys called before capture types are inferred"),
+            ty => bug!("Unexpected representation of upvar types tuple {:?}", ty),
+        }
+    }
+
+    #[inline]
+    pub fn tupled_upvars_ty(self) -> Ty<'tcx> {
+        self.split().tupled_upvars_ty
+    }
+
+    pub fn kind_ty(self) -> Ty<'tcx> {
+        self.split().closure_kind_ty
+    }
+
+    pub fn kind(self) -> ty::ClosureKind {
+        self.kind_ty().to_opt_closure_kind().unwrap()
+    }
+
+    pub fn signature_parts_ty(self) -> Ty<'tcx> {
+        self.split().signature_parts_ty
+    }
+
+    pub fn coroutine_closure_sig(self) -> ty::Binder<'tcx, CoroutineClosureSignature<'tcx>> {
+        let interior = self.coroutine_witness_ty();
+        let ty::FnPtr(sig) = self.signature_parts_ty().kind() else { bug!() };
+        sig.map_bound(|sig| {
+            let [resume_ty, tupled_inputs_ty] = *sig.inputs() else {
+                bug!();
+            };
+            let [yield_ty, return_ty] = **sig.output().tuple_fields() else { bug!() };
+            CoroutineClosureSignature {
+                interior,
+                tupled_inputs_ty,
+                resume_ty,
+                yield_ty,
+                return_ty,
+                c_variadic: sig.c_variadic,
+                unsafety: sig.unsafety,
+                abi: sig.abi,
+            }
+        })
+    }
+
+    pub fn coroutine_captures_by_ref_ty(self) -> Ty<'tcx> {
+        self.split().coroutine_captures_by_ref_ty
+    }
+
+    pub fn coroutine_witness_ty(self) -> Ty<'tcx> {
+        self.split().coroutine_witness_ty
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Debug, TypeFoldable, TypeVisitable)]
+pub struct CoroutineClosureSignature<'tcx> {
+    pub interior: Ty<'tcx>,
+    pub tupled_inputs_ty: Ty<'tcx>,
+    pub resume_ty: Ty<'tcx>,
+    pub yield_ty: Ty<'tcx>,
+    pub return_ty: Ty<'tcx>,
+
+    // Like the `fn_sig_as_fn_ptr_ty` of a regular closure, these types
+    // never actually differ. But we save them rather than recreating them
+    // from scratch just for good measure.
+    /// Always false
+    pub c_variadic: bool,
+    /// Always [`hir::Unsafety::Normal`]
+    pub unsafety: hir::Unsafety,
+    /// Always [`abi::Abi::RustCall`]
+    pub abi: abi::Abi,
+}
+
+impl<'tcx> CoroutineClosureSignature<'tcx> {
+    /// Construct a coroutine from the closure signature. Since a coroutine signature
+    /// is agnostic to the type of generator that is returned (by-ref/by-move),
+    /// the caller must specify what "flavor" of generator that they'd like to
+    /// create. Additionally, they must manually compute the upvars of the closure.
+    ///
+    /// This helper is not really meant to be used directly except for early on
+    /// during typeck, when we want to put inference vars into the kind and upvars tys.
+    /// When the kind and upvars are known, use the other helper functions.
+    pub fn to_coroutine(
+        self,
+        tcx: TyCtxt<'tcx>,
+        parent_args: &'tcx [GenericArg<'tcx>],
+        coroutine_kind_ty: Ty<'tcx>,
+        coroutine_def_id: DefId,
+        tupled_upvars_ty: Ty<'tcx>,
+    ) -> Ty<'tcx> {
+        let coroutine_args = ty::CoroutineArgs::new(
+            tcx,
+            ty::CoroutineArgsParts {
+                parent_args,
+                kind_ty: coroutine_kind_ty,
+                resume_ty: self.resume_ty,
+                yield_ty: self.yield_ty,
+                return_ty: self.return_ty,
+                witness: self.interior,
+                tupled_upvars_ty,
+            },
+        );
+
+        Ty::new_coroutine(tcx, coroutine_def_id, coroutine_args.args)
+    }
+
+    /// Given known upvars and a [`ClosureKind`](ty::ClosureKind), compute the coroutine
+    /// returned by that corresponding async fn trait.
+    ///
+    /// This function expects the upvars to have been computed already, and doesn't check
+    /// that the `ClosureKind` is actually supported by the coroutine-closure.
+    pub fn to_coroutine_given_kind_and_upvars(
+        self,
+        tcx: TyCtxt<'tcx>,
+        parent_args: &'tcx [GenericArg<'tcx>],
+        coroutine_def_id: DefId,
+        goal_kind: ty::ClosureKind,
+        env_region: ty::Region<'tcx>,
+        closure_tupled_upvars_ty: Ty<'tcx>,
+        coroutine_captures_by_ref_ty: Ty<'tcx>,
+    ) -> Ty<'tcx> {
+        let tupled_upvars_ty = Self::tupled_upvars_by_closure_kind(
+            tcx,
+            goal_kind,
+            self.tupled_inputs_ty,
+            closure_tupled_upvars_ty,
+            coroutine_captures_by_ref_ty,
+            env_region,
+        );
+
+        self.to_coroutine(
+            tcx,
+            parent_args,
+            Ty::from_closure_kind(tcx, goal_kind),
+            coroutine_def_id,
+            tupled_upvars_ty,
+        )
+    }
+
+    /// Compute the tupled upvars that a coroutine-closure's output coroutine
+    /// would return for the given `ClosureKind`.
+    ///
+    /// When `ClosureKind` is `FnMut`/`Fn`, then this will use the "captures by ref"
+    /// to return a set of upvars which are borrowed with the given `env_region`.
+    ///
+    /// This ensures that the `AsyncFn::call` will return a coroutine whose upvars'
+    /// lifetimes are related to the lifetime of the borrow on the closure made for
+    /// the call. This allows borrowck to enforce the self-borrows correctly.
+    pub fn tupled_upvars_by_closure_kind(
+        tcx: TyCtxt<'tcx>,
+        kind: ty::ClosureKind,
+        tupled_inputs_ty: Ty<'tcx>,
+        closure_tupled_upvars_ty: Ty<'tcx>,
+        coroutine_captures_by_ref_ty: Ty<'tcx>,
+        env_region: ty::Region<'tcx>,
+    ) -> Ty<'tcx> {
+        match kind {
+            ty::ClosureKind::Fn | ty::ClosureKind::FnMut => {
+                let ty::FnPtr(sig) = *coroutine_captures_by_ref_ty.kind() else {
+                    bug!();
+                };
+                let coroutine_captures_by_ref_ty = tcx.replace_escaping_bound_vars_uncached(
+                    sig.output().skip_binder(),
+                    FnMutDelegate {
+                        consts: &mut |c, t| ty::Const::new_bound(tcx, ty::INNERMOST, c, t),
+                        types: &mut |t| Ty::new_bound(tcx, ty::INNERMOST, t),
+                        regions: &mut |_| env_region,
+                    },
+                );
+                Ty::new_tup_from_iter(
+                    tcx,
+                    tupled_inputs_ty
+                        .tuple_fields()
+                        .iter()
+                        .chain(coroutine_captures_by_ref_ty.tuple_fields()),
+                )
+            }
+            ty::ClosureKind::FnOnce => Ty::new_tup_from_iter(
+                tcx,
+                tupled_inputs_ty
+                    .tuple_fields()
+                    .iter()
+                    .chain(closure_tupled_upvars_ty.tuple_fields()),
+            ),
+        }
+    }
+}
 /// Similar to `ClosureArgs`; see the above documentation for more.
 #[derive(Copy, Clone, PartialEq, Eq, Debug, TypeFoldable, TypeVisitable)]
 pub struct CoroutineArgs<'tcx> {
@@ -278,13 +548,27 @@ pub struct CoroutineArgs<'tcx> {
 pub struct CoroutineArgsParts<'tcx> {
     /// This is the args of the typeck root.
     pub parent_args: &'tcx [GenericArg<'tcx>],
+
+    /// The coroutines returned by a coroutine-closure's `AsyncFnOnce`/`AsyncFnMut`
+    /// implementations must be distinguished since the former takes the closure's
+    /// upvars by move, and the latter takes the closure's upvars by ref.
+    ///
+    /// This field distinguishes these fields so that codegen can select the right
+    /// body for the coroutine. This has the same type representation as the closure
+    /// kind: `i8`/`i16`/`i32`.
+    ///
+    /// For regular coroutines, this field will always just be `()`.
+    pub kind_ty: Ty<'tcx>,
+
     pub resume_ty: Ty<'tcx>,
     pub yield_ty: Ty<'tcx>,
     pub return_ty: Ty<'tcx>,
+
     /// The interior type of the coroutine.
     /// Represents all types that are stored in locals
     /// in the coroutine's body.
     pub witness: Ty<'tcx>,
+
     /// The upvars captured by the closure. Remains an inference variable
     /// until the upvar analysis, which happens late in HIR typeck.
     pub tupled_upvars_ty: Ty<'tcx>,
@@ -296,6 +580,7 @@ impl<'tcx> CoroutineArgs<'tcx> {
     pub fn new(tcx: TyCtxt<'tcx>, parts: CoroutineArgsParts<'tcx>) -> CoroutineArgs<'tcx> {
         CoroutineArgs {
             args: tcx.mk_args_from_iter(parts.parent_args.iter().copied().chain([
+                parts.kind_ty.into(),
                 parts.resume_ty.into(),
                 parts.yield_ty.into(),
                 parts.return_ty.into(),
@@ -309,16 +594,23 @@ impl<'tcx> CoroutineArgs<'tcx> {
     /// The ordering assumed here must match that used by `CoroutineArgs::new` above.
     fn split(self) -> CoroutineArgsParts<'tcx> {
         match self.args[..] {
-            [ref parent_args @ .., resume_ty, yield_ty, return_ty, witness, tupled_upvars_ty] => {
-                CoroutineArgsParts {
-                    parent_args,
-                    resume_ty: resume_ty.expect_ty(),
-                    yield_ty: yield_ty.expect_ty(),
-                    return_ty: return_ty.expect_ty(),
-                    witness: witness.expect_ty(),
-                    tupled_upvars_ty: tupled_upvars_ty.expect_ty(),
-                }
-            }
+            [
+                ref parent_args @ ..,
+                kind_ty,
+                resume_ty,
+                yield_ty,
+                return_ty,
+                witness,
+                tupled_upvars_ty,
+            ] => CoroutineArgsParts {
+                parent_args,
+                kind_ty: kind_ty.expect_ty(),
+                resume_ty: resume_ty.expect_ty(),
+                yield_ty: yield_ty.expect_ty(),
+                return_ty: return_ty.expect_ty(),
+                witness: witness.expect_ty(),
+                tupled_upvars_ty: tupled_upvars_ty.expect_ty(),
+            },
             _ => bug!("coroutine args missing synthetics"),
         }
     }
@@ -328,6 +620,11 @@ impl<'tcx> CoroutineArgs<'tcx> {
         self.split().parent_args
     }
 
+    // Returns the kind of the coroutine. See docs on the `kind_ty` field.
+    pub fn kind_ty(self) -> Ty<'tcx> {
+        self.split().kind_ty
+    }
+
     /// This describes the types that can be contained in a coroutine.
     /// It will be a type variable initially and unified in the last stages of typeck of a body.
     /// It contains a tuple of all the types that could end up on a coroutine frame.
@@ -479,6 +776,7 @@ impl<'tcx> CoroutineArgs<'tcx> {
 pub enum UpvarArgs<'tcx> {
     Closure(GenericArgsRef<'tcx>),
     Coroutine(GenericArgsRef<'tcx>),
+    CoroutineClosure(GenericArgsRef<'tcx>),
 }
 
 impl<'tcx> UpvarArgs<'tcx> {
@@ -490,6 +788,7 @@ impl<'tcx> UpvarArgs<'tcx> {
         let tupled_tys = match self {
             UpvarArgs::Closure(args) => args.as_closure().tupled_upvars_ty(),
             UpvarArgs::Coroutine(args) => args.as_coroutine().tupled_upvars_ty(),
+            UpvarArgs::CoroutineClosure(args) => args.as_coroutine_closure().tupled_upvars_ty(),
         };
 
         match tupled_tys.kind() {
@@ -505,6 +804,7 @@ impl<'tcx> UpvarArgs<'tcx> {
         match self {
             UpvarArgs::Closure(args) => args.as_closure().tupled_upvars_ty(),
             UpvarArgs::Coroutine(args) => args.as_coroutine().tupled_upvars_ty(),
+            UpvarArgs::CoroutineClosure(args) => args.as_coroutine_closure().tupled_upvars_ty(),
         }
     }
 }
@@ -1393,6 +1693,20 @@ impl<'tcx> Ty<'tcx> {
         Ty::new(tcx, Closure(def_id, closure_args))
     }
 
+    #[inline]
+    pub fn new_coroutine_closure(
+        tcx: TyCtxt<'tcx>,
+        def_id: DefId,
+        closure_args: GenericArgsRef<'tcx>,
+    ) -> Ty<'tcx> {
+        debug_assert_eq!(
+            closure_args.len(),
+            tcx.generics_of(tcx.typeck_root_def_id(def_id)).count() + 5,
+            "closure constructed with incorrect substitutions"
+        );
+        Ty::new(tcx, CoroutineClosure(def_id, closure_args))
+    }
+
     #[inline]
     pub fn new_coroutine(
         tcx: TyCtxt<'tcx>,
@@ -1401,7 +1715,7 @@ impl<'tcx> Ty<'tcx> {
     ) -> Ty<'tcx> {
         debug_assert_eq!(
             coroutine_args.len(),
-            tcx.generics_of(tcx.typeck_root_def_id(def_id)).count() + 5,
+            tcx.generics_of(tcx.typeck_root_def_id(def_id)).count() + 6,
             "coroutine constructed with incorrect number of substitutions"
         );
         Ty::new(tcx, Coroutine(def_id, coroutine_args))
@@ -1727,6 +2041,11 @@ impl<'tcx> Ty<'tcx> {
         matches!(self.kind(), Coroutine(..))
     }
 
+    #[inline]
+    pub fn is_coroutine_closure(self) -> bool {
+        matches!(self.kind(), CoroutineClosure(..))
+    }
+
     #[inline]
     pub fn is_integral(self) -> bool {
         matches!(self.kind(), Infer(IntVar(_)) | Int(_) | Uint(_))
@@ -1795,7 +2114,7 @@ impl<'tcx> Ty<'tcx> {
             type BreakTy = ();
 
             fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
-                if let ty::Closure(_, _) = t.kind() {
+                if let ty::Closure(..) = t.kind() {
                     ControlFlow::Break(())
                 } else {
                     t.super_visit_with(self)
@@ -1942,6 +2261,7 @@ impl<'tcx> Ty<'tcx> {
             | ty::FnPtr(..)
             | ty::Dynamic(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::CoroutineWitness(..)
             | ty::Never
             | ty::Tuple(_)
@@ -1980,6 +2300,7 @@ impl<'tcx> Ty<'tcx> {
             | ty::CoroutineWitness(..)
             | ty::Array(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Never
             | ty::Error(_)
             // Extern types have metadata = ().
@@ -2034,7 +2355,7 @@ impl<'tcx> Ty<'tcx> {
 
             // "Bound" types appear in canonical queries when the
             // closure type is not yet known
-            Bound(..) | Infer(_) => None,
+            Bound(..) | Param(_) | Infer(_) => None,
 
             Error(_) => Some(ty::ClosureKind::Fn),
 
@@ -2077,6 +2398,7 @@ impl<'tcx> Ty<'tcx> {
             | ty::CoroutineWitness(..)
             | ty::Array(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Never
             | ty::Error(_) => true,
 
@@ -2140,7 +2462,7 @@ impl<'tcx> Ty<'tcx> {
             ty::Coroutine(..) | ty::CoroutineWitness(..) => false,
 
             // Might be, but not "trivial" so just giving the safe answer.
-            ty::Adt(..) | ty::Closure(..) => false,
+            ty::Adt(..) | ty::Closure(..) | ty::CoroutineClosure(..) => false,
 
             // Needs normalization or revealing to determine, so no is the safe answer.
             ty::Alias(..) => false,
@@ -2212,6 +2534,7 @@ impl<'tcx> Ty<'tcx> {
             | FnPtr(_)
             | Dynamic(_, _, _)
             | Closure(_, _)
+            | CoroutineClosure(_, _)
             | Coroutine(_, _)
             | CoroutineWitness(..)
             | Never
diff --git a/compiler/rustc_middle/src/ty/util.rs b/compiler/rustc_middle/src/ty/util.rs
index 8cc8abbe718d1..4feaeb0dd0523 100644
--- a/compiler/rustc_middle/src/ty/util.rs
+++ b/compiler/rustc_middle/src/ty/util.rs
@@ -1119,6 +1119,7 @@ impl<'tcx> Ty<'tcx> {
             ty::Adt(..)
             | ty::Bound(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Dynamic(..)
             | ty::Foreign(_)
             | ty::Coroutine(..)
@@ -1158,6 +1159,7 @@ impl<'tcx> Ty<'tcx> {
             ty::Adt(..)
             | ty::Bound(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Dynamic(..)
             | ty::Foreign(_)
             | ty::Coroutine(..)
@@ -1280,7 +1282,11 @@ impl<'tcx> Ty<'tcx> {
             // Conservatively return `false` for all others...
 
             // Anonymous function types
-            ty::FnDef(..) | ty::Closure(..) | ty::Dynamic(..) | ty::Coroutine(..) => false,
+            ty::FnDef(..)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
+            | ty::Dynamic(..)
+            | ty::Coroutine(..) => false,
 
             // Generic or inferred types
             //
@@ -1424,6 +1430,7 @@ pub fn needs_drop_components<'tcx>(
         | ty::Placeholder(..)
         | ty::Infer(_)
         | ty::Closure(..)
+        | ty::CoroutineClosure(..)
         | ty::Coroutine(..)
         | ty::CoroutineWitness(..) => Ok(smallvec![ty]),
     }
@@ -1456,7 +1463,11 @@ pub fn is_trivially_const_drop(ty: Ty<'_>) -> bool {
 
         // Not trivial because they have components, and instead of looking inside,
         // we'll just perform trait selection.
-        ty::Closure(..) | ty::Coroutine(..) | ty::CoroutineWitness(..) | ty::Adt(..) => false,
+        ty::Closure(..)
+        | ty::CoroutineClosure(..)
+        | ty::Coroutine(..)
+        | ty::CoroutineWitness(..)
+        | ty::Adt(..) => false,
 
         ty::Array(ty, _) | ty::Slice(ty) => is_trivially_const_drop(ty),
 
diff --git a/compiler/rustc_middle/src/ty/walk.rs b/compiler/rustc_middle/src/ty/walk.rs
index 9050716db9d38..46c26241c3e78 100644
--- a/compiler/rustc_middle/src/ty/walk.rs
+++ b/compiler/rustc_middle/src/ty/walk.rs
@@ -189,6 +189,7 @@ fn push_inner<'tcx>(stack: &mut TypeWalkerStack<'tcx>, parent: GenericArg<'tcx>)
             }
             ty::Adt(_, args)
             | ty::Closure(_, args)
+            | ty::CoroutineClosure(_, args)
             | ty::Coroutine(_, args)
             | ty::CoroutineWitness(_, args)
             | ty::FnDef(_, args) => {
diff --git a/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs b/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs
index 6e8af7bb6df6c..c77f4a06d0569 100644
--- a/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs
+++ b/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs
@@ -483,6 +483,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     UpvarArgs::Closure(args) => {
                         Box::new(AggregateKind::Closure(closure_id.to_def_id(), args))
                     }
+                    UpvarArgs::CoroutineClosure(args) => {
+                        Box::new(AggregateKind::CoroutineClosure(closure_id.to_def_id(), args))
+                    }
                 };
                 block.and(Rvalue::Aggregate(result, operands))
             }
diff --git a/compiler/rustc_mir_build/src/build/mod.rs b/compiler/rustc_mir_build/src/build/mod.rs
index 714c5f2686eb5..9a2f2ceced1ed 100644
--- a/compiler/rustc_mir_build/src/build/mod.rs
+++ b/compiler/rustc_mir_build/src/build/mod.rs
@@ -495,7 +495,7 @@ fn construct_fn<'tcx>(
             args.as_coroutine().yield_ty(),
             args.as_coroutine().resume_ty(),
         ))),
-        ty::Closure(..) | ty::FnDef(..) => None,
+        ty::Closure(..) | ty::CoroutineClosure(..) | ty::FnDef(..) => None,
         ty => span_bug!(span_with_body, "unexpected type of body: {ty:?}"),
     };
 
@@ -822,6 +822,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         let upvar_args = match closure_ty.kind() {
             ty::Closure(_, args) => ty::UpvarArgs::Closure(args),
             ty::Coroutine(_, args) => ty::UpvarArgs::Coroutine(args),
+            ty::CoroutineClosure(_, args) => ty::UpvarArgs::CoroutineClosure(args),
             _ => return,
         };
 
diff --git a/compiler/rustc_mir_build/src/thir/cx/expr.rs b/compiler/rustc_mir_build/src/thir/cx/expr.rs
index 22094c112fc18..35adcc33480ca 100644
--- a/compiler/rustc_mir_build/src/thir/cx/expr.rs
+++ b/compiler/rustc_mir_build/src/thir/cx/expr.rs
@@ -556,6 +556,9 @@ impl<'tcx> Cx<'tcx> {
                     ty::Coroutine(def_id, args) => {
                         (def_id, UpvarArgs::Coroutine(args), Some(tcx.coroutine_movability(def_id)))
                     }
+                    ty::CoroutineClosure(def_id, args) => {
+                        (def_id, UpvarArgs::CoroutineClosure(args), None)
+                    }
                     _ => {
                         span_bug!(expr.span, "closure expr w/o closure type: {:?}", closure_ty);
                     }
diff --git a/compiler/rustc_mir_build/src/thir/cx/mod.rs b/compiler/rustc_mir_build/src/thir/cx/mod.rs
index 5d0bb3954ccc6..f4f591d15b933 100644
--- a/compiler/rustc_mir_build/src/thir/cx/mod.rs
+++ b/compiler/rustc_mir_build/src/thir/cx/mod.rs
@@ -127,10 +127,24 @@ impl<'tcx> Cx<'tcx> {
             ty::Coroutine(..) => {
                 Param { ty: closure_ty, pat: None, ty_span: None, self_kind: None, hir_id: None }
             }
-            ty::Closure(_, closure_args) => {
+            ty::Closure(_, args) => {
                 let closure_env_ty = self.tcx.closure_env_ty(
                     closure_ty,
-                    closure_args.as_closure().kind(),
+                    args.as_closure().kind(),
+                    self.tcx.lifetimes.re_erased,
+                );
+                Param {
+                    ty: closure_env_ty,
+                    pat: None,
+                    ty_span: None,
+                    self_kind: None,
+                    hir_id: None,
+                }
+            }
+            ty::CoroutineClosure(_, args) => {
+                let closure_env_ty = self.tcx.closure_env_ty(
+                    closure_ty,
+                    args.as_coroutine_closure().kind(),
                     self.tcx.lifetimes.re_erased,
                 );
                 Param {
diff --git a/compiler/rustc_mir_dataflow/src/elaborate_drops.rs b/compiler/rustc_mir_dataflow/src/elaborate_drops.rs
index 862876f53c76c..1b2f2cd9477fc 100644
--- a/compiler/rustc_mir_dataflow/src/elaborate_drops.rs
+++ b/compiler/rustc_mir_dataflow/src/elaborate_drops.rs
@@ -861,6 +861,9 @@ where
         let ty = self.place_ty(self.place);
         match ty.kind() {
             ty::Closure(_, args) => self.open_drop_for_tuple(args.as_closure().upvar_tys()),
+            ty::CoroutineClosure(_, args) => {
+                self.open_drop_for_tuple(args.as_coroutine_closure().upvar_tys())
+            }
             // Note that `elaborate_drops` only drops the upvars of a coroutine,
             // and this is ok because `open_drop` here can only be reached
             // within that own coroutine's resume function.
diff --git a/compiler/rustc_mir_dataflow/src/move_paths/builder.rs b/compiler/rustc_mir_dataflow/src/move_paths/builder.rs
index 38ee26c5a876e..30dd915521cd2 100644
--- a/compiler/rustc_mir_dataflow/src/move_paths/builder.rs
+++ b/compiler/rustc_mir_dataflow/src/move_paths/builder.rs
@@ -154,7 +154,8 @@ impl<'b, 'a, 'tcx, F: Fn(Ty<'tcx>) -> bool> Gatherer<'b, 'a, 'tcx, F> {
                     | ty::FnDef(_, _)
                     | ty::FnPtr(_)
                     | ty::Dynamic(_, _, _)
-                    | ty::Closure(_, _)
+                    | ty::Closure(..)
+                    | ty::CoroutineClosure(..)
                     | ty::Coroutine(_, _)
                     | ty::CoroutineWitness(..)
                     | ty::Never
@@ -177,7 +178,10 @@ impl<'b, 'a, 'tcx, F: Fn(Ty<'tcx>) -> bool> Gatherer<'b, 'a, 'tcx, F> {
                             union_path.get_or_insert(base);
                         }
                     }
-                    ty::Closure(_, _) | ty::Coroutine(_, _) | ty::Tuple(_) => (),
+                    ty::Closure(..)
+                    | ty::CoroutineClosure(..)
+                    | ty::Coroutine(_, _)
+                    | ty::Tuple(_) => (),
                     ty::Bool
                     | ty::Char
                     | ty::Int(_)
diff --git a/compiler/rustc_mir_dataflow/src/value_analysis.rs b/compiler/rustc_mir_dataflow/src/value_analysis.rs
index 2802f5491be03..2b2af6ee7da3e 100644
--- a/compiler/rustc_mir_dataflow/src/value_analysis.rs
+++ b/compiler/rustc_mir_dataflow/src/value_analysis.rs
@@ -1149,6 +1149,12 @@ pub fn iter_fields<'tcx>(
         ty::Closure(_, args) => {
             iter_fields(args.as_closure().tupled_upvars_ty(), tcx, param_env, f);
         }
+        ty::Coroutine(_, args) => {
+            iter_fields(args.as_coroutine().tupled_upvars_ty(), tcx, param_env, f);
+        }
+        ty::CoroutineClosure(_, args) => {
+            iter_fields(args.as_coroutine_closure().tupled_upvars_ty(), tcx, param_env, f);
+        }
         _ => (),
     }
 }
diff --git a/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs b/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
index dfc7a9891f921..451d3be255fdf 100644
--- a/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
+++ b/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
@@ -39,6 +39,7 @@ impl<'tcx> MirPass<'tcx> for AbortUnwindingCalls {
         let body_abi = match body_ty.kind() {
             ty::FnDef(..) => body_ty.fn_sig(tcx).abi(),
             ty::Closure(..) => Abi::RustCall,
+            ty::CoroutineClosure(..) => Abi::RustCall,
             ty::Coroutine(..) => Abi::Rust,
             _ => span_bug!(body.span, "unexpected body ty: {:?}", body_ty),
         };
diff --git a/compiler/rustc_mir_transform/src/check_unsafety.rs b/compiler/rustc_mir_transform/src/check_unsafety.rs
index 6c4c3917cb5ec..fbb626953835e 100644
--- a/compiler/rustc_mir_transform/src/check_unsafety.rs
+++ b/compiler/rustc_mir_transform/src/check_unsafety.rs
@@ -128,7 +128,9 @@ impl<'tcx> Visitor<'tcx> for UnsafetyChecker<'_, 'tcx> {
                         ),
                     }
                 }
-                &AggregateKind::Closure(def_id, _) | &AggregateKind::Coroutine(def_id, _) => {
+                &AggregateKind::Closure(def_id, _)
+                | &AggregateKind::CoroutineClosure(def_id, _)
+                | &AggregateKind::Coroutine(def_id, _) => {
                     let def_id = def_id.expect_local();
                     let UnsafetyCheckResult { violations, used_unsafe_blocks, .. } =
                         self.tcx.mir_unsafety_check_result(def_id);
diff --git a/compiler/rustc_mir_transform/src/const_prop_lint.rs b/compiler/rustc_mir_transform/src/const_prop_lint.rs
index aa22b8c7c58e0..f2448ee3d44af 100644
--- a/compiler/rustc_mir_transform/src/const_prop_lint.rs
+++ b/compiler/rustc_mir_transform/src/const_prop_lint.rs
@@ -607,7 +607,8 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
                     AggregateKind::Array(_)
                     | AggregateKind::Tuple
                     | AggregateKind::Closure(_, _)
-                    | AggregateKind::Coroutine(_, _) => VariantIdx::new(0),
+                    | AggregateKind::Coroutine(_, _)
+                    | AggregateKind::CoroutineClosure(_, _) => VariantIdx::new(0),
                 },
             },
 
diff --git a/compiler/rustc_mir_transform/src/coroutine.rs b/compiler/rustc_mir_transform/src/coroutine.rs
index bde879f6067c5..297b2fa143de2 100644
--- a/compiler/rustc_mir_transform/src/coroutine.rs
+++ b/compiler/rustc_mir_transform/src/coroutine.rs
@@ -50,6 +50,9 @@
 //! For coroutines with state 1 (returned) and state 2 (poisoned) it does nothing.
 //! Otherwise it drops all the values in scope at the last suspension point.
 
+mod by_move_body;
+pub use by_move_body::ByMoveBody;
+
 use crate::abort_unwinding_calls;
 use crate::deref_separator::deref_finder;
 use crate::errors;
diff --git a/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs b/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
new file mode 100644
index 0000000000000..fcd4715b9e88c
--- /dev/null
+++ b/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
@@ -0,0 +1,156 @@
+//! A MIR pass which duplicates a coroutine's body and removes any derefs which
+//! would be present for upvars that are taken by-ref. The result of which will
+//! be a coroutine body that takes all of its upvars by-move, and which we stash
+//! into the `CoroutineInfo` for all coroutines returned by coroutine-closures.
+
+use rustc_data_structures::fx::FxIndexSet;
+use rustc_hir as hir;
+use rustc_middle::mir::visit::MutVisitor;
+use rustc_middle::mir::{self, dump_mir, MirPass};
+use rustc_middle::ty::{self, InstanceDef, Ty, TyCtxt};
+use rustc_target::abi::FieldIdx;
+
+pub struct ByMoveBody;
+
+impl<'tcx> MirPass<'tcx> for ByMoveBody {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut mir::Body<'tcx>) {
+        let Some(coroutine_def_id) = body.source.def_id().as_local() else {
+            return;
+        };
+        let Some(hir::CoroutineKind::Desugared(_, hir::CoroutineSource::Closure)) =
+            tcx.coroutine_kind(coroutine_def_id)
+        else {
+            return;
+        };
+        let coroutine_ty = body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty;
+        let ty::Coroutine(_, args) = *coroutine_ty.kind() else { bug!() };
+
+        let coroutine_kind = args.as_coroutine().kind_ty().to_opt_closure_kind().unwrap();
+        if coroutine_kind == ty::ClosureKind::FnOnce {
+            return;
+        }
+
+        let mut by_ref_fields = FxIndexSet::default();
+        let by_move_upvars = Ty::new_tup_from_iter(
+            tcx,
+            tcx.closure_captures(coroutine_def_id).iter().enumerate().map(|(idx, capture)| {
+                if capture.is_by_ref() {
+                    by_ref_fields.insert(FieldIdx::from_usize(idx));
+                }
+                capture.place.ty()
+            }),
+        );
+        let by_move_coroutine_ty = Ty::new_coroutine(
+            tcx,
+            coroutine_def_id.to_def_id(),
+            ty::CoroutineArgs::new(
+                tcx,
+                ty::CoroutineArgsParts {
+                    parent_args: args.as_coroutine().parent_args(),
+                    kind_ty: Ty::from_closure_kind(tcx, ty::ClosureKind::FnOnce),
+                    resume_ty: args.as_coroutine().resume_ty(),
+                    yield_ty: args.as_coroutine().yield_ty(),
+                    return_ty: args.as_coroutine().return_ty(),
+                    witness: args.as_coroutine().witness(),
+                    tupled_upvars_ty: by_move_upvars,
+                },
+            )
+            .args,
+        );
+
+        let mut by_move_body = body.clone();
+        MakeByMoveBody { tcx, by_ref_fields, by_move_coroutine_ty }.visit_body(&mut by_move_body);
+        dump_mir(tcx, false, "coroutine_by_move", &0, &by_move_body, |_, _| Ok(()));
+        by_move_body.source = mir::MirSource {
+            instance: InstanceDef::CoroutineKindShim {
+                coroutine_def_id: coroutine_def_id.to_def_id(),
+                target_kind: ty::ClosureKind::FnOnce,
+            },
+            promoted: None,
+        };
+        body.coroutine.as_mut().unwrap().by_move_body = Some(by_move_body);
+
+        // If this is coming from an `AsyncFn` coroutine-closure, we must also create a by-mut body.
+        // This is actually just a copy of the by-ref body, but with a different self type.
+        // FIXME(async_closures): We could probably unify this with the by-ref body somehow.
+        if coroutine_kind == ty::ClosureKind::Fn {
+            let by_mut_coroutine_ty = Ty::new_coroutine(
+                tcx,
+                coroutine_def_id.to_def_id(),
+                ty::CoroutineArgs::new(
+                    tcx,
+                    ty::CoroutineArgsParts {
+                        parent_args: args.as_coroutine().parent_args(),
+                        kind_ty: Ty::from_closure_kind(tcx, ty::ClosureKind::FnMut),
+                        resume_ty: args.as_coroutine().resume_ty(),
+                        yield_ty: args.as_coroutine().yield_ty(),
+                        return_ty: args.as_coroutine().return_ty(),
+                        witness: args.as_coroutine().witness(),
+                        tupled_upvars_ty: args.as_coroutine().tupled_upvars_ty(),
+                    },
+                )
+                .args,
+            );
+            let mut by_mut_body = body.clone();
+            by_mut_body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty = by_mut_coroutine_ty;
+            dump_mir(tcx, false, "coroutine_by_mut", &0, &by_mut_body, |_, _| Ok(()));
+            by_mut_body.source = mir::MirSource {
+                instance: InstanceDef::CoroutineKindShim {
+                    coroutine_def_id: coroutine_def_id.to_def_id(),
+                    target_kind: ty::ClosureKind::FnMut,
+                },
+                promoted: None,
+            };
+            body.coroutine.as_mut().unwrap().by_mut_body = Some(by_mut_body);
+        }
+    }
+}
+
+struct MakeByMoveBody<'tcx> {
+    tcx: TyCtxt<'tcx>,
+    by_ref_fields: FxIndexSet<FieldIdx>,
+    by_move_coroutine_ty: Ty<'tcx>,
+}
+
+impl<'tcx> MutVisitor<'tcx> for MakeByMoveBody<'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
+    fn visit_place(
+        &mut self,
+        place: &mut mir::Place<'tcx>,
+        context: mir::visit::PlaceContext,
+        location: mir::Location,
+    ) {
+        if place.local == ty::CAPTURE_STRUCT_LOCAL
+            && !place.projection.is_empty()
+            && let mir::ProjectionElem::Field(idx, ty) = place.projection[0]
+            && self.by_ref_fields.contains(&idx)
+        {
+            let (begin, end) = place.projection[1..].split_first().unwrap();
+            // FIXME(async_closures): I'm actually a bit surprised to see that we always
+            // initially deref the by-ref upvars. If this is not actually true, then we
+            // will at least get an ICE that explains why this isn't true :^)
+            assert_eq!(*begin, mir::ProjectionElem::Deref);
+            // Peel one ref off of the ty.
+            let peeled_ty = ty.builtin_deref(true).unwrap().ty;
+            *place = mir::Place {
+                local: place.local,
+                projection: self.tcx.mk_place_elems_from_iter(
+                    [mir::ProjectionElem::Field(idx, peeled_ty)]
+                        .into_iter()
+                        .chain(end.iter().copied()),
+                ),
+            };
+        }
+        self.super_place(place, context, location);
+    }
+
+    fn visit_local_decl(&mut self, local: mir::Local, local_decl: &mut mir::LocalDecl<'tcx>) {
+        // Replace the type of the self arg.
+        if local == ty::CAPTURE_STRUCT_LOCAL {
+            local_decl.ty = self.by_move_coroutine_ty;
+        }
+    }
+}
diff --git a/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs b/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
index 5b4d58836b486..01fae7c0bec86 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
@@ -156,7 +156,9 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
 fn is_closure_or_coroutine(statement: &Statement<'_>) -> bool {
     match statement.kind {
         StatementKind::Assign(box (_, Rvalue::Aggregate(box ref agg_kind, _))) => match agg_kind {
-            AggregateKind::Closure(_, _) | AggregateKind::Coroutine(_, _) => true,
+            AggregateKind::Closure(_, _)
+            | AggregateKind::Coroutine(_, _)
+            | AggregateKind::CoroutineClosure(..) => true,
             _ => false,
         },
         _ => false,
diff --git a/compiler/rustc_mir_transform/src/dataflow_const_prop.rs b/compiler/rustc_mir_transform/src/dataflow_const_prop.rs
index ad12bce9b0232..6a37047a69387 100644
--- a/compiler/rustc_mir_transform/src/dataflow_const_prop.rs
+++ b/compiler/rustc_mir_transform/src/dataflow_const_prop.rs
@@ -696,6 +696,7 @@ fn try_write_constant<'tcx>(
         | ty::Bound(..)
         | ty::Placeholder(..)
         | ty::Closure(..)
+        | ty::CoroutineClosure(..)
         | ty::Coroutine(..)
         | ty::Dynamic(..) => throw_machine_stop_str!("unsupported type"),
 
diff --git a/compiler/rustc_mir_transform/src/ffi_unwind_calls.rs b/compiler/rustc_mir_transform/src/ffi_unwind_calls.rs
index db7dfc5b43efa..b0d758bcbfe3b 100644
--- a/compiler/rustc_mir_transform/src/ffi_unwind_calls.rs
+++ b/compiler/rustc_mir_transform/src/ffi_unwind_calls.rs
@@ -57,6 +57,7 @@ fn has_ffi_unwind_calls(tcx: TyCtxt<'_>, local_def_id: LocalDefId) -> bool {
     let body_abi = match body_ty.kind() {
         ty::FnDef(..) => body_ty.fn_sig(tcx).abi(),
         ty::Closure(..) => Abi::RustCall,
+        ty::CoroutineClosure(..) => Abi::RustCall,
         ty::Coroutine(..) => Abi::Rust,
         _ => span_bug!(body.span, "unexpected body ty: {:?}", body_ty),
     };
diff --git a/compiler/rustc_mir_transform/src/gvn.rs b/compiler/rustc_mir_transform/src/gvn.rs
index 390ec3e1a36ac..f9798bc4e70e6 100644
--- a/compiler/rustc_mir_transform/src/gvn.rs
+++ b/compiler/rustc_mir_transform/src/gvn.rs
@@ -861,9 +861,10 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
         let tcx = self.tcx;
         if fields.is_empty() {
             let is_zst = match *kind {
-                AggregateKind::Array(..) | AggregateKind::Tuple | AggregateKind::Closure(..) => {
-                    true
-                }
+                AggregateKind::Array(..)
+                | AggregateKind::Tuple
+                | AggregateKind::Closure(..)
+                | AggregateKind::CoroutineClosure(..) => true,
                 // Only enums can be non-ZST.
                 AggregateKind::Adt(did, ..) => tcx.def_kind(did) != DefKind::Enum,
                 // Coroutines are never ZST, as they at least contain the implicit states.
@@ -885,7 +886,9 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
                 assert!(!fields.is_empty());
                 (AggregateTy::Tuple, FIRST_VARIANT)
             }
-            AggregateKind::Closure(did, substs) | AggregateKind::Coroutine(did, substs) => {
+            AggregateKind::Closure(did, substs)
+            | AggregateKind::CoroutineClosure(did, substs)
+            | AggregateKind::Coroutine(did, substs) => {
                 (AggregateTy::Def(did, substs), FIRST_VARIANT)
             }
             AggregateKind::Adt(did, variant_index, substs, _, None) => {
diff --git a/compiler/rustc_mir_transform/src/inline.rs b/compiler/rustc_mir_transform/src/inline.rs
index 67668a216dee3..e77553a03d672 100644
--- a/compiler/rustc_mir_transform/src/inline.rs
+++ b/compiler/rustc_mir_transform/src/inline.rs
@@ -317,6 +317,8 @@ impl<'tcx> Inliner<'tcx> {
             | InstanceDef::ReifyShim(_)
             | InstanceDef::FnPtrShim(..)
             | InstanceDef::ClosureOnceShim { .. }
+            | InstanceDef::ConstructCoroutineInClosureShim { .. }
+            | InstanceDef::CoroutineKindShim { .. }
             | InstanceDef::DropGlue(..)
             | InstanceDef::CloneShim(..)
             | InstanceDef::ThreadLocalShim(..)
diff --git a/compiler/rustc_mir_transform/src/inline/cycle.rs b/compiler/rustc_mir_transform/src/inline/cycle.rs
index d30e0bad81301..5b03bc361dd3c 100644
--- a/compiler/rustc_mir_transform/src/inline/cycle.rs
+++ b/compiler/rustc_mir_transform/src/inline/cycle.rs
@@ -87,6 +87,8 @@ pub(crate) fn mir_callgraph_reachable<'tcx>(
                 | InstanceDef::ReifyShim(_)
                 | InstanceDef::FnPtrShim(..)
                 | InstanceDef::ClosureOnceShim { .. }
+                | InstanceDef::ConstructCoroutineInClosureShim { .. }
+                | InstanceDef::CoroutineKindShim { .. }
                 | InstanceDef::ThreadLocalShim { .. }
                 | InstanceDef::CloneShim(..) => {}
 
diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index 69f93fa3a0e21..031515ea95828 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -307,6 +307,10 @@ fn mir_const(tcx: TyCtxt<'_>, def: LocalDefId) -> &Steal<Body<'_>> {
             &Lint(check_packed_ref::CheckPackedRef),
             &Lint(check_const_item_mutation::CheckConstItemMutation),
             &Lint(function_item_references::FunctionItemReferences),
+            // If this is an async closure's output coroutine, generate
+            // by-move and by-mut bodies if needed. We do this first so
+            // they can be optimized in lockstep with their parent bodies.
+            &coroutine::ByMoveBody,
             // What we need to do constant evaluation.
             &simplify::SimplifyCfg::Initial,
             &rustc_peek::SanityCheck, // Just a lint
diff --git a/compiler/rustc_mir_transform/src/pass_manager.rs b/compiler/rustc_mir_transform/src/pass_manager.rs
index c1ef2b9f887fb..605e1ad46d775 100644
--- a/compiler/rustc_mir_transform/src/pass_manager.rs
+++ b/compiler/rustc_mir_transform/src/pass_manager.rs
@@ -189,6 +189,15 @@ fn run_passes_inner<'tcx>(
 
         body.pass_count = 1;
     }
+
+    if let Some(coroutine) = body.coroutine.as_mut() {
+        if let Some(by_move_body) = coroutine.by_move_body.as_mut() {
+            run_passes_inner(tcx, by_move_body, passes, phase_change, validate_each);
+        }
+        if let Some(by_mut_body) = coroutine.by_mut_body.as_mut() {
+            run_passes_inner(tcx, by_mut_body, passes, phase_change, validate_each);
+        }
+    }
 }
 
 pub fn validate_body<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, when: String) {
diff --git a/compiler/rustc_mir_transform/src/remove_zsts.rs b/compiler/rustc_mir_transform/src/remove_zsts.rs
index 34d57a45301d7..9a94cae338288 100644
--- a/compiler/rustc_mir_transform/src/remove_zsts.rs
+++ b/compiler/rustc_mir_transform/src/remove_zsts.rs
@@ -46,6 +46,7 @@ fn maybe_zst(ty: Ty<'_>) -> bool {
         ty::Adt(..)
         | ty::Array(..)
         | ty::Closure(..)
+        | ty::CoroutineClosure(..)
         | ty::Tuple(..)
         | ty::Alias(ty::Opaque, ..) => true,
         // definitely ZST
diff --git a/compiler/rustc_mir_transform/src/shim.rs b/compiler/rustc_mir_transform/src/shim.rs
index 89414ce940e05..7b6de3a543955 100644
--- a/compiler/rustc_mir_transform/src/shim.rs
+++ b/compiler/rustc_mir_transform/src/shim.rs
@@ -3,8 +3,8 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::mir::*;
 use rustc_middle::query::Providers;
-use rustc_middle::ty::GenericArgs;
 use rustc_middle::ty::{self, CoroutineArgs, EarlyBinder, Ty, TyCtxt};
+use rustc_middle::ty::{GenericArgs, CAPTURE_STRUCT_LOCAL};
 use rustc_target::abi::{FieldIdx, VariantIdx, FIRST_VARIANT};
 
 use rustc_index::{Idx, IndexVec};
@@ -66,11 +66,76 @@ fn make_shim<'tcx>(tcx: TyCtxt<'tcx>, instance: ty::InstanceDef<'tcx>) -> Body<'
             build_call_shim(tcx, instance, Some(Adjustment::RefMut), CallKind::Direct(call_mut))
         }
 
+        ty::InstanceDef::ConstructCoroutineInClosureShim {
+            coroutine_closure_def_id,
+            target_kind,
+        } => match target_kind {
+            ty::ClosureKind::Fn => unreachable!("shouldn't be building shim for Fn"),
+            ty::ClosureKind::FnMut => {
+                // No need to optimize the body, it has already been optimized
+                // since we steal it from the `AsyncFn::call` body and just fix
+                // the return type.
+                return build_construct_coroutine_by_mut_shim(tcx, coroutine_closure_def_id);
+            }
+            ty::ClosureKind::FnOnce => {
+                build_construct_coroutine_by_move_shim(tcx, coroutine_closure_def_id)
+            }
+        },
+
+        ty::InstanceDef::CoroutineKindShim { coroutine_def_id, target_kind } => match target_kind {
+            ty::ClosureKind::Fn => unreachable!(),
+            ty::ClosureKind::FnMut => {
+                return tcx
+                    .optimized_mir(coroutine_def_id)
+                    .coroutine_by_mut_body()
+                    .unwrap()
+                    .clone();
+            }
+            ty::ClosureKind::FnOnce => {
+                return tcx
+                    .optimized_mir(coroutine_def_id)
+                    .coroutine_by_move_body()
+                    .unwrap()
+                    .clone();
+            }
+        },
+
         ty::InstanceDef::DropGlue(def_id, ty) => {
             // FIXME(#91576): Drop shims for coroutines aren't subject to the MIR passes at the end
             // of this function. Is this intentional?
             if let Some(ty::Coroutine(coroutine_def_id, args)) = ty.map(Ty::kind) {
-                let body = tcx.optimized_mir(*coroutine_def_id).coroutine_drop().unwrap();
+                let coroutine_body = tcx.optimized_mir(*coroutine_def_id);
+
+                let ty::Coroutine(_, id_args) = *tcx.type_of(coroutine_def_id).skip_binder().kind()
+                else {
+                    bug!()
+                };
+
+                // If this is a regular coroutine, grab its drop shim. If this is a coroutine
+                // that comes from a coroutine-closure, and the kind ty differs from the "maximum"
+                // kind that it supports, then grab the appropriate drop shim. This ensures that
+                // the future returned by `<[coroutine-closure] as AsyncFnOnce>::call_once` will
+                // drop the coroutine-closure's upvars.
+                let body = if id_args.as_coroutine().kind_ty() == args.as_coroutine().kind_ty() {
+                    coroutine_body.coroutine_drop().unwrap()
+                } else {
+                    match args.as_coroutine().kind_ty().to_opt_closure_kind().unwrap() {
+                        ty::ClosureKind::Fn => {
+                            unreachable!()
+                        }
+                        ty::ClosureKind::FnMut => coroutine_body
+                            .coroutine_by_mut_body()
+                            .unwrap()
+                            .coroutine_drop()
+                            .unwrap(),
+                        ty::ClosureKind::FnOnce => coroutine_body
+                            .coroutine_by_move_body()
+                            .unwrap()
+                            .coroutine_drop()
+                            .unwrap(),
+                    }
+                };
+
                 let mut body = EarlyBinder::bind(body.clone()).instantiate(tcx, args);
                 debug!("make_shim({:?}) = {:?}", instance, body);
 
@@ -981,3 +1046,114 @@ fn build_fn_ptr_addr_shim<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId, self_ty: Ty<'t
     let source = MirSource::from_instance(ty::InstanceDef::FnPtrAddrShim(def_id, self_ty));
     new_body(source, IndexVec::from_elem_n(start_block, 1), locals, sig.inputs().len(), span)
 }
+
+fn build_construct_coroutine_by_move_shim<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    coroutine_closure_def_id: DefId,
+) -> Body<'tcx> {
+    let self_ty = tcx.type_of(coroutine_closure_def_id).instantiate_identity();
+    let ty::CoroutineClosure(_, args) = *self_ty.kind() else {
+        bug!();
+    };
+
+    let poly_sig = args.as_coroutine_closure().coroutine_closure_sig().map_bound(|sig| {
+        tcx.mk_fn_sig(
+            [self_ty].into_iter().chain(sig.tupled_inputs_ty.tuple_fields()),
+            sig.to_coroutine_given_kind_and_upvars(
+                tcx,
+                args.as_coroutine_closure().parent_args(),
+                tcx.coroutine_for_closure(coroutine_closure_def_id),
+                ty::ClosureKind::FnOnce,
+                tcx.lifetimes.re_erased,
+                args.as_coroutine_closure().tupled_upvars_ty(),
+                args.as_coroutine_closure().coroutine_captures_by_ref_ty(),
+            ),
+            sig.c_variadic,
+            sig.unsafety,
+            sig.abi,
+        )
+    });
+    let sig = tcx.liberate_late_bound_regions(coroutine_closure_def_id, poly_sig);
+    let ty::Coroutine(coroutine_def_id, coroutine_args) = *sig.output().kind() else {
+        bug!();
+    };
+
+    let span = tcx.def_span(coroutine_closure_def_id);
+    let locals = local_decls_for_sig(&sig, span);
+
+    let mut fields = vec![];
+    for idx in 1..sig.inputs().len() {
+        fields.push(Operand::Move(Local::from_usize(idx + 1).into()));
+    }
+    for (idx, ty) in args.as_coroutine_closure().upvar_tys().iter().enumerate() {
+        fields.push(Operand::Move(tcx.mk_place_field(
+            Local::from_usize(1).into(),
+            FieldIdx::from_usize(idx),
+            ty,
+        )));
+    }
+
+    let source_info = SourceInfo::outermost(span);
+    let rvalue = Rvalue::Aggregate(
+        Box::new(AggregateKind::Coroutine(coroutine_def_id, coroutine_args)),
+        IndexVec::from_raw(fields),
+    );
+    let stmt = Statement {
+        source_info,
+        kind: StatementKind::Assign(Box::new((Place::return_place(), rvalue))),
+    };
+    let statements = vec![stmt];
+    let start_block = BasicBlockData {
+        statements,
+        terminator: Some(Terminator { source_info, kind: TerminatorKind::Return }),
+        is_cleanup: false,
+    };
+
+    let source = MirSource::from_instance(ty::InstanceDef::ConstructCoroutineInClosureShim {
+        coroutine_closure_def_id,
+        target_kind: ty::ClosureKind::FnOnce,
+    });
+
+    let body =
+        new_body(source, IndexVec::from_elem_n(start_block, 1), locals, sig.inputs().len(), span);
+    dump_mir(tcx, false, "coroutine_closure_by_move", &0, &body, |_, _| Ok(()));
+
+    body
+}
+
+fn build_construct_coroutine_by_mut_shim<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    coroutine_closure_def_id: DefId,
+) -> Body<'tcx> {
+    let mut body = tcx.optimized_mir(coroutine_closure_def_id).clone();
+    let coroutine_closure_ty = tcx.type_of(coroutine_closure_def_id).instantiate_identity();
+    let ty::CoroutineClosure(_, args) = *coroutine_closure_ty.kind() else {
+        bug!();
+    };
+    let args = args.as_coroutine_closure();
+
+    body.local_decls[RETURN_PLACE].ty =
+        tcx.instantiate_bound_regions_with_erased(args.coroutine_closure_sig().map_bound(|sig| {
+            sig.to_coroutine_given_kind_and_upvars(
+                tcx,
+                args.parent_args(),
+                tcx.coroutine_for_closure(coroutine_closure_def_id),
+                ty::ClosureKind::FnMut,
+                tcx.lifetimes.re_erased,
+                args.tupled_upvars_ty(),
+                args.coroutine_captures_by_ref_ty(),
+            )
+        }));
+    body.local_decls[CAPTURE_STRUCT_LOCAL].ty =
+        Ty::new_mut_ref(tcx, tcx.lifetimes.re_erased, coroutine_closure_ty);
+
+    body.source = MirSource::from_instance(ty::InstanceDef::ConstructCoroutineInClosureShim {
+        coroutine_closure_def_id,
+        target_kind: ty::ClosureKind::FnMut,
+    });
+
+    body.pass_count = 0;
+    dump_mir(tcx, false, "coroutine_closure_by_mut", &0, &body, |_, _| Ok(()));
+
+    body
+}
diff --git a/compiler/rustc_monomorphize/src/collector.rs b/compiler/rustc_monomorphize/src/collector.rs
index b86244e5a4bfd..3376af986531e 100644
--- a/compiler/rustc_monomorphize/src/collector.rs
+++ b/compiler/rustc_monomorphize/src/collector.rs
@@ -983,6 +983,8 @@ fn visit_instance_use<'tcx>(
         | ty::InstanceDef::VTableShim(..)
         | ty::InstanceDef::ReifyShim(..)
         | ty::InstanceDef::ClosureOnceShim { .. }
+        | ty::InstanceDef::ConstructCoroutineInClosureShim { .. }
+        | ty::InstanceDef::CoroutineKindShim { .. }
         | ty::InstanceDef::Item(..)
         | ty::InstanceDef::FnPtrShim(..)
         | ty::InstanceDef::CloneShim(..)
diff --git a/compiler/rustc_monomorphize/src/partitioning.rs b/compiler/rustc_monomorphize/src/partitioning.rs
index 7ff182381b835..4f6ea66df7be1 100644
--- a/compiler/rustc_monomorphize/src/partitioning.rs
+++ b/compiler/rustc_monomorphize/src/partitioning.rs
@@ -620,6 +620,8 @@ fn characteristic_def_id_of_mono_item<'tcx>(
                 | ty::InstanceDef::ReifyShim(..)
                 | ty::InstanceDef::FnPtrShim(..)
                 | ty::InstanceDef::ClosureOnceShim { .. }
+                | ty::InstanceDef::ConstructCoroutineInClosureShim { .. }
+                | ty::InstanceDef::CoroutineKindShim { .. }
                 | ty::InstanceDef::Intrinsic(..)
                 | ty::InstanceDef::DropGlue(..)
                 | ty::InstanceDef::Virtual(..)
@@ -783,6 +785,8 @@ fn mono_item_visibility<'tcx>(
         | InstanceDef::Virtual(..)
         | InstanceDef::Intrinsic(..)
         | InstanceDef::ClosureOnceShim { .. }
+        | InstanceDef::ConstructCoroutineInClosureShim { .. }
+        | InstanceDef::CoroutineKindShim { .. }
         | InstanceDef::DropGlue(..)
         | InstanceDef::CloneShim(..)
         | InstanceDef::FnPtrAddrShim(..) => return Visibility::Hidden,
diff --git a/compiler/rustc_next_trait_solver/src/canonicalizer.rs b/compiler/rustc_next_trait_solver/src/canonicalizer.rs
index db1aee1190359..42edbeaa622c2 100644
--- a/compiler/rustc_next_trait_solver/src/canonicalizer.rs
+++ b/compiler/rustc_next_trait_solver/src/canonicalizer.rs
@@ -332,7 +332,8 @@ impl<Infcx: InferCtxtLike<Interner = I>, I: Interner> TypeFolder<I>
             | ty::FnDef(_, _)
             | ty::FnPtr(_)
             | ty::Dynamic(_, _, _)
-            | ty::Closure(_, _)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(_, _)
             | ty::CoroutineWitness(..)
             | ty::Never
diff --git a/compiler/rustc_passes/src/liveness.rs b/compiler/rustc_passes/src/liveness.rs
index 99f8186d5543b..f7c382bcd7a40 100644
--- a/compiler/rustc_passes/src/liveness.rs
+++ b/compiler/rustc_passes/src/liveness.rs
@@ -719,6 +719,11 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
                 ty::ClosureKind::FnMut => {}
                 ty::ClosureKind::FnOnce => return succ,
             },
+            ty::CoroutineClosure(_def_id, args) => match args.as_coroutine_closure().kind() {
+                ty::ClosureKind::Fn => {}
+                ty::ClosureKind::FnMut => {}
+                ty::ClosureKind::FnOnce => return succ,
+            },
             ty::Coroutine(..) => return succ,
             _ => {
                 span_bug!(
diff --git a/compiler/rustc_pattern_analysis/src/rustc.rs b/compiler/rustc_pattern_analysis/src/rustc.rs
index c02a24048f9bd..b60f32f71c2f1 100644
--- a/compiler/rustc_pattern_analysis/src/rustc.rs
+++ b/compiler/rustc_pattern_analysis/src/rustc.rs
@@ -423,7 +423,8 @@ impl<'p, 'tcx> RustcMatchCheckCtxt<'p, 'tcx> {
             | ty::FnDef(_, _)
             | ty::FnPtr(_)
             | ty::Dynamic(_, _, _)
-            | ty::Closure(_, _)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(_, _)
             | ty::Alias(_, _)
             | ty::Param(_)
diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs
index a64b06e70d6bc..a37d8822480af 100644
--- a/compiler/rustc_privacy/src/lib.rs
+++ b/compiler/rustc_privacy/src/lib.rs
@@ -182,6 +182,7 @@ where
             | ty::Foreign(def_id)
             | ty::FnDef(def_id, ..)
             | ty::Closure(def_id, ..)
+            | ty::CoroutineClosure(def_id, ..)
             | ty::Coroutine(def_id, ..) => {
                 self.def_id_visitor.visit_def_id(def_id, "type", &ty)?;
                 if V::SHALLOW {
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/mir.rs b/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
index e433460e2ad9d..41a4edfc03b58 100644
--- a/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
+++ b/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
@@ -538,6 +538,9 @@ impl<'tcx> Stable<'tcx> for mir::AggregateKind<'tcx> {
                     tables.tcx.coroutine_movability(*def_id).stable(tables),
                 )
             }
+            mir::AggregateKind::CoroutineClosure(..) => {
+                todo!("FIXME(async_closures): Lower these to SMIR")
+            }
         }
     }
 }
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
index ba957843bb079..959a17d24b7ce 100644
--- a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
+++ b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
@@ -383,6 +383,7 @@ impl<'tcx> Stable<'tcx> for ty::TyKind<'tcx> {
                 tables.closure_def(*def_id),
                 generic_args.stable(tables),
             )),
+            ty::CoroutineClosure(..) => todo!("FIXME(async_closures): Lower these to SMIR"),
             ty::Coroutine(def_id, generic_args) => TyKind::RigidTy(RigidTy::Coroutine(
                 tables.coroutine_def(*def_id),
                 generic_args.stable(tables),
@@ -798,6 +799,8 @@ impl<'tcx> Stable<'tcx> for ty::Instance<'tcx> {
             | ty::InstanceDef::ReifyShim(..)
             | ty::InstanceDef::FnPtrAddrShim(..)
             | ty::InstanceDef::ClosureOnceShim { .. }
+            | ty::InstanceDef::ConstructCoroutineInClosureShim { .. }
+            | ty::InstanceDef::CoroutineKindShim { .. }
             | ty::InstanceDef::ThreadLocalShim(..)
             | ty::InstanceDef::DropGlue(..)
             | ty::InstanceDef::CloneShim(..)
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 2dca9808ada85..ed6e69d919949 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -167,6 +167,9 @@ symbols! {
         Break,
         C,
         CStr,
+        CallFuture,
+        CallMutFuture,
+        CallOnceFuture,
         Capture,
         Center,
         Cleanup,
@@ -318,6 +321,7 @@ symbols! {
         TyCtxt,
         TyKind,
         Unknown,
+        Upvars,
         Vec,
         VecDeque,
         Wrapper,
@@ -420,6 +424,7 @@ symbols! {
         async_closure,
         async_fn,
         async_fn_in_trait,
+        async_fn_kind_helper,
         async_fn_mut,
         async_fn_once,
         async_fn_track_caller,
diff --git a/compiler/rustc_symbol_mangling/src/legacy.rs b/compiler/rustc_symbol_mangling/src/legacy.rs
index 4a5f58443bc29..646649293fc76 100644
--- a/compiler/rustc_symbol_mangling/src/legacy.rs
+++ b/compiler/rustc_symbol_mangling/src/legacy.rs
@@ -64,16 +64,29 @@ pub(super) fn mangle<'tcx>(
         )
         .unwrap();
 
-    if let ty::InstanceDef::ThreadLocalShim(..) = instance.def {
-        let _ = printer.write_str("{{tls-shim}}");
-    }
-
-    if let ty::InstanceDef::VTableShim(..) = instance.def {
-        let _ = printer.write_str("{{vtable-shim}}");
-    }
-
-    if let ty::InstanceDef::ReifyShim(..) = instance.def {
-        let _ = printer.write_str("{{reify-shim}}");
+    match instance.def {
+        ty::InstanceDef::ThreadLocalShim(..) => {
+            printer.write_str("{{tls-shim}}").unwrap();
+        }
+        ty::InstanceDef::VTableShim(..) => {
+            printer.write_str("{{vtable-shim}}").unwrap();
+        }
+        ty::InstanceDef::ReifyShim(..) => {
+            printer.write_str("{{reify-shim}}").unwrap();
+        }
+        // FIXME(async_closures): This shouldn't be needed when we fix
+        // `Instance::ty`/`Instance::def_id`.
+        ty::InstanceDef::ConstructCoroutineInClosureShim { target_kind, .. }
+        | ty::InstanceDef::CoroutineKindShim { target_kind, .. } => match target_kind {
+            ty::ClosureKind::Fn => unreachable!(),
+            ty::ClosureKind::FnMut => {
+                printer.write_str("{{fn-mut-shim}}").unwrap();
+            }
+            ty::ClosureKind::FnOnce => {
+                printer.write_str("{{fn-once-shim}}").unwrap();
+            }
+        },
+        _ => {}
     }
 
     printer.path.finish(hash)
@@ -211,6 +224,7 @@ impl<'tcx> Printer<'tcx> for SymbolPrinter<'tcx> {
             ty::FnDef(def_id, args)
             | ty::Alias(ty::Projection | ty::Opaque, ty::AliasTy { def_id, args, .. })
             | ty::Closure(def_id, args)
+            | ty::CoroutineClosure(def_id, args)
             | ty::Coroutine(def_id, args) => self.print_def_path(def_id, args),
 
             // The `pretty_print_type` formatting of array size depends on
@@ -281,7 +295,11 @@ impl<'tcx> Printer<'tcx> for SymbolPrinter<'tcx> {
         // Similar to `pretty_path_qualified`, but for the other
         // types that are printed as paths (see `print_type` above).
         match self_ty.kind() {
-            ty::FnDef(..) | ty::Alias(..) | ty::Closure(..) | ty::Coroutine(..)
+            ty::FnDef(..)
+            | ty::Alias(..)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
+            | ty::Coroutine(..)
                 if trait_ref.is_none() =>
             {
                 self.print_type(self_ty)
diff --git a/compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs b/compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs
index 0cc82ac7506cb..9d1b92e106803 100644
--- a/compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs
+++ b/compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs
@@ -628,7 +628,9 @@ fn encode_ty<'tcx>(
         }
 
         // Function types
-        ty::FnDef(def_id, args) | ty::Closure(def_id, args) => {
+        ty::FnDef(def_id, args)
+        | ty::Closure(def_id, args)
+        | ty::CoroutineClosure(def_id, args) => {
             // u<length><name>[I<element-type1..element-typeN>E], where <element-type> is <subst>,
             // as vendor extended type.
             let mut s = String::new();
@@ -895,6 +897,10 @@ fn transform_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, options: TransformTyOptio
             ty = Ty::new_closure(tcx, *def_id, transform_args(tcx, args, options));
         }
 
+        ty::CoroutineClosure(def_id, args) => {
+            ty = Ty::new_coroutine_closure(tcx, *def_id, transform_args(tcx, args, options));
+        }
+
         ty::Coroutine(def_id, args) => {
             ty = Ty::new_coroutine(tcx, *def_id, transform_args(tcx, args, options));
         }
diff --git a/compiler/rustc_symbol_mangling/src/v0.rs b/compiler/rustc_symbol_mangling/src/v0.rs
index 16ebda55a7a51..530221555c52e 100644
--- a/compiler/rustc_symbol_mangling/src/v0.rs
+++ b/compiler/rustc_symbol_mangling/src/v0.rs
@@ -46,6 +46,13 @@ pub(super) fn mangle<'tcx>(
         ty::InstanceDef::VTableShim(_) => Some("vtable"),
         ty::InstanceDef::ReifyShim(_) => Some("reify"),
 
+        ty::InstanceDef::ConstructCoroutineInClosureShim { target_kind, .. }
+        | ty::InstanceDef::CoroutineKindShim { target_kind, .. } => match target_kind {
+            ty::ClosureKind::Fn => unreachable!(),
+            ty::ClosureKind::FnMut => Some("fn_mut"),
+            ty::ClosureKind::FnOnce => Some("fn_once"),
+        },
+
         _ => None,
     };
 
@@ -386,6 +393,7 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
             | ty::FnDef(def_id, args)
             | ty::Alias(ty::Projection | ty::Opaque, ty::AliasTy { def_id, args, .. })
             | ty::Closure(def_id, args)
+            | ty::CoroutineClosure(def_id, args)
             | ty::Coroutine(def_id, args) => {
                 self.print_def_path(def_id, args)?;
             }
diff --git a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs
index 915d722dd0206..7052fd776b0f2 100644
--- a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs
+++ b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs
@@ -182,6 +182,22 @@ pub(super) trait GoalKind<'tcx>:
         kind: ty::ClosureKind,
     ) -> QueryResult<'tcx>;
 
+    /// An async closure is known to implement the `AsyncFn<A>` family of traits
+    /// where `A` is given by the signature of the type.
+    fn consider_builtin_async_fn_trait_candidates(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+        kind: ty::ClosureKind,
+    ) -> QueryResult<'tcx>;
+
+    /// Compute the built-in logic of the `AsyncFnKindHelper` helper trait, which
+    /// is used internally to delay computation for async closures until after
+    /// upvar analysis is performed in HIR typeck.
+    fn consider_builtin_async_fn_kind_helper_candidate(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> QueryResult<'tcx>;
+
     /// `Tuple` is implemented if the `Self` type is a tuple.
     fn consider_builtin_tuple_candidate(
         ecx: &mut EvalCtxt<'_, 'tcx>,
@@ -340,7 +356,8 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             | ty::FnDef(_, _)
             | ty::FnPtr(_)
             | ty::Dynamic(_, _, _)
-            | ty::Closure(_, _)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(_, _)
             | ty::Never
             | ty::Tuple(_) => {
@@ -460,6 +477,10 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             G::consider_builtin_fn_ptr_trait_candidate(self, goal)
         } else if let Some(kind) = self.tcx().fn_trait_kind_from_def_id(trait_def_id) {
             G::consider_builtin_fn_trait_candidates(self, goal, kind)
+        } else if let Some(kind) = self.tcx().async_fn_trait_kind_from_def_id(trait_def_id) {
+            G::consider_builtin_async_fn_trait_candidates(self, goal, kind)
+        } else if lang_items.async_fn_kind_helper() == Some(trait_def_id) {
+            G::consider_builtin_async_fn_kind_helper_candidate(self, goal)
         } else if lang_items.tuple_trait() == Some(trait_def_id) {
             G::consider_builtin_tuple_candidate(self, goal)
         } else if lang_items.pointee_trait() == Some(trait_def_id) {
@@ -538,6 +559,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             | ty::FnPtr(_)
             | ty::Dynamic(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Never
@@ -694,6 +716,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             | ty::FnPtr(_)
             | ty::Alias(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Never
diff --git a/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs b/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
index 274a75a125c58..d02578c484649 100644
--- a/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
+++ b/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
@@ -1,12 +1,14 @@
 //! Code which is used by built-in goals that match "structurally", such a auto
 //! traits, `Copy`/`Clone`.
 use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::LangItem;
 use rustc_hir::{def_id::DefId, Movability, Mutability};
 use rustc_infer::traits::query::NoSolution;
 use rustc_middle::traits::solve::Goal;
 use rustc_middle::ty::{
-    self, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt,
+    self, ToPredicate, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt,
 };
+use rustc_span::sym;
 
 use crate::solve::EvalCtxt;
 
@@ -57,6 +59,8 @@ pub(in crate::solve) fn instantiate_constituent_tys_for_auto_trait<'tcx>(
 
         ty::Closure(_, args) => Ok(vec![args.as_closure().tupled_upvars_ty()]),
 
+        ty::CoroutineClosure(_, args) => Ok(vec![args.as_coroutine_closure().tupled_upvars_ty()]),
+
         ty::Coroutine(_, args) => {
             let coroutine_args = args.as_coroutine();
             Ok(vec![coroutine_args.tupled_upvars_ty(), coroutine_args.witness()])
@@ -128,6 +132,7 @@ pub(in crate::solve) fn instantiate_constituent_tys_for_sized_trait<'tcx>(
         | ty::CoroutineWitness(..)
         | ty::Array(..)
         | ty::Closure(..)
+        | ty::CoroutineClosure(..)
         | ty::Never
         | ty::Dynamic(_, _, ty::DynStar)
         | ty::Error(_) => Ok(vec![]),
@@ -193,6 +198,8 @@ pub(in crate::solve) fn instantiate_constituent_tys_for_copy_clone_trait<'tcx>(
 
         ty::Closure(_, args) => Ok(vec![args.as_closure().tupled_upvars_ty()]),
 
+        ty::CoroutineClosure(..) => Err(NoSolution),
+
         ty::Coroutine(def_id, args) => match ecx.tcx().coroutine_movability(def_id) {
             Movability::Static => Err(NoSolution),
             Movability::Movable => {
@@ -267,6 +274,131 @@ pub(in crate::solve) fn extract_tupled_inputs_and_output_from_callable<'tcx>(
             }
             Ok(Some(closure_args.sig().map_bound(|sig| (sig.inputs()[0], sig.output()))))
         }
+
+        // Coroutine-closures don't implement `Fn` traits the normal way.
+        ty::CoroutineClosure(..) => Err(NoSolution),
+
+        ty::Bool
+        | ty::Char
+        | ty::Int(_)
+        | ty::Uint(_)
+        | ty::Float(_)
+        | ty::Adt(_, _)
+        | ty::Foreign(_)
+        | ty::Str
+        | ty::Array(_, _)
+        | ty::Slice(_)
+        | ty::RawPtr(_)
+        | ty::Ref(_, _, _)
+        | ty::Dynamic(_, _, _)
+        | ty::Coroutine(_, _)
+        | ty::CoroutineWitness(..)
+        | ty::Never
+        | ty::Tuple(_)
+        | ty::Alias(_, _)
+        | ty::Param(_)
+        | ty::Placeholder(..)
+        | ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
+        | ty::Error(_) => Err(NoSolution),
+
+        ty::Bound(..)
+        | ty::Infer(ty::TyVar(_) | ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
+            bug!("unexpected type `{self_ty}`")
+        }
+    }
+}
+
+// Returns a binder of the tupled inputs types, output type, and coroutine type
+// from a builtin coroutine-closure type. If we don't yet know the closure kind of
+// the coroutine-closure, emit an additional trait predicate for `AsyncFnKindHelper`
+// which enforces the closure is actually callable with the given trait. When we
+// know the kind already, we can short-circuit this check.
+pub(in crate::solve) fn extract_tupled_inputs_and_output_from_async_callable<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    self_ty: Ty<'tcx>,
+    goal_kind: ty::ClosureKind,
+    env_region: ty::Region<'tcx>,
+) -> Result<
+    (ty::Binder<'tcx, (Ty<'tcx>, Ty<'tcx>, Ty<'tcx>)>, Option<ty::Predicate<'tcx>>),
+    NoSolution,
+> {
+    match *self_ty.kind() {
+        ty::CoroutineClosure(def_id, args) => {
+            let args = args.as_coroutine_closure();
+            let kind_ty = args.kind_ty();
+
+            if let Some(closure_kind) = kind_ty.to_opt_closure_kind() {
+                if !closure_kind.extends(goal_kind) {
+                    return Err(NoSolution);
+                }
+                Ok((
+                    args.coroutine_closure_sig().map_bound(|sig| {
+                        let coroutine_ty = sig.to_coroutine_given_kind_and_upvars(
+                            tcx,
+                            args.parent_args(),
+                            tcx.coroutine_for_closure(def_id),
+                            goal_kind,
+                            env_region,
+                            args.tupled_upvars_ty(),
+                            args.coroutine_captures_by_ref_ty(),
+                        );
+                        (sig.tupled_inputs_ty, sig.return_ty, coroutine_ty)
+                    }),
+                    None,
+                ))
+            } else {
+                let async_fn_kind_trait_def_id =
+                    tcx.require_lang_item(LangItem::AsyncFnKindHelper, None);
+                let upvars_projection_def_id = tcx
+                    .associated_items(async_fn_kind_trait_def_id)
+                    .filter_by_name_unhygienic(sym::Upvars)
+                    .next()
+                    .unwrap()
+                    .def_id;
+                // When we don't know the closure kind (and therefore also the closure's upvars,
+                // which are computed at the same time), we must delay the computation of the
+                // generator's upvars. We do this using the `AsyncFnKindHelper`, which as a trait
+                // goal functions similarly to the old `ClosureKind` predicate, and ensures that
+                // the goal kind <= the closure kind. As a projection `AsyncFnKindHelper::Upvars`
+                // will project to the right upvars for the generator, appending the inputs and
+                // coroutine upvars respecting the closure kind.
+                Ok((
+                    args.coroutine_closure_sig().map_bound(|sig| {
+                        let tupled_upvars_ty = Ty::new_projection(
+                            tcx,
+                            upvars_projection_def_id,
+                            [
+                                ty::GenericArg::from(kind_ty),
+                                Ty::from_closure_kind(tcx, goal_kind).into(),
+                                env_region.into(),
+                                sig.tupled_inputs_ty.into(),
+                                args.tupled_upvars_ty().into(),
+                                args.coroutine_captures_by_ref_ty().into(),
+                            ],
+                        );
+                        let coroutine_ty = sig.to_coroutine(
+                            tcx,
+                            args.parent_args(),
+                            Ty::from_closure_kind(tcx, goal_kind),
+                            tcx.coroutine_for_closure(def_id),
+                            tupled_upvars_ty,
+                        );
+                        (sig.tupled_inputs_ty, sig.return_ty, coroutine_ty)
+                    }),
+                    Some(
+                        ty::TraitRef::new(
+                            tcx,
+                            async_fn_kind_trait_def_id,
+                            [kind_ty, Ty::from_closure_kind(tcx, goal_kind)],
+                        )
+                        .to_predicate(tcx),
+                    ),
+                ))
+            }
+        }
+
+        ty::FnDef(..) | ty::FnPtr(..) | ty::Closure(..) => Err(NoSolution),
+
         ty::Bool
         | ty::Char
         | ty::Int(_)
diff --git a/compiler/rustc_trait_selection/src/solve/normalizes_to/mod.rs b/compiler/rustc_trait_selection/src/solve/normalizes_to/mod.rs
index 9f1b4a09a20ba..47ba549022d9b 100644
--- a/compiler/rustc_trait_selection/src/solve/normalizes_to/mod.rs
+++ b/compiler/rustc_trait_selection/src/solve/normalizes_to/mod.rs
@@ -366,6 +366,119 @@ impl<'tcx> assembly::GoalKind<'tcx> for NormalizesTo<'tcx> {
         Self::consider_implied_clause(ecx, goal, pred, [goal.with(tcx, output_is_sized_pred)])
     }
 
+    fn consider_builtin_async_fn_trait_candidates(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+        goal_kind: ty::ClosureKind,
+    ) -> QueryResult<'tcx> {
+        let tcx = ecx.tcx();
+
+        let env_region = match goal_kind {
+            ty::ClosureKind::Fn | ty::ClosureKind::FnMut => goal.predicate.alias.args.region_at(2),
+            // Doesn't matter what this region is
+            ty::ClosureKind::FnOnce => tcx.lifetimes.re_static,
+        };
+        let (tupled_inputs_and_output_and_coroutine, nested_preds) =
+            structural_traits::extract_tupled_inputs_and_output_from_async_callable(
+                tcx,
+                goal.predicate.self_ty(),
+                goal_kind,
+                env_region,
+            )?;
+        let output_is_sized_pred =
+            tupled_inputs_and_output_and_coroutine.map_bound(|(_, output, _)| {
+                ty::TraitRef::from_lang_item(tcx, LangItem::Sized, DUMMY_SP, [output])
+            });
+
+        let pred = tupled_inputs_and_output_and_coroutine
+            .map_bound(|(inputs, output, coroutine)| {
+                let (projection_ty, term) = match tcx.item_name(goal.predicate.def_id()) {
+                    sym::CallOnceFuture => (
+                        ty::AliasTy::new(
+                            tcx,
+                            goal.predicate.def_id(),
+                            [goal.predicate.self_ty(), inputs],
+                        ),
+                        coroutine.into(),
+                    ),
+                    sym::CallMutFuture | sym::CallFuture => (
+                        ty::AliasTy::new(
+                            tcx,
+                            goal.predicate.def_id(),
+                            [
+                                ty::GenericArg::from(goal.predicate.self_ty()),
+                                inputs.into(),
+                                env_region.into(),
+                            ],
+                        ),
+                        coroutine.into(),
+                    ),
+                    sym::Output => (
+                        ty::AliasTy::new(
+                            tcx,
+                            goal.predicate.def_id(),
+                            [ty::GenericArg::from(goal.predicate.self_ty()), inputs.into()],
+                        ),
+                        output.into(),
+                    ),
+                    name => bug!("no such associated type: {name}"),
+                };
+                ty::ProjectionPredicate { projection_ty, term }
+            })
+            .to_predicate(tcx);
+
+        // A built-in `AsyncFn` impl only holds if the output is sized.
+        // (FIXME: technically we only need to check this if the type is a fn ptr...)
+        Self::consider_implied_clause(
+            ecx,
+            goal,
+            pred,
+            [goal.with(tcx, output_is_sized_pred)]
+                .into_iter()
+                .chain(nested_preds.into_iter().map(|pred| goal.with(tcx, pred))),
+        )
+    }
+
+    fn consider_builtin_async_fn_kind_helper_candidate(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> QueryResult<'tcx> {
+        let [
+            closure_fn_kind_ty,
+            goal_kind_ty,
+            borrow_region,
+            tupled_inputs_ty,
+            tupled_upvars_ty,
+            coroutine_captures_by_ref_ty,
+        ] = **goal.predicate.alias.args
+        else {
+            bug!();
+        };
+
+        let Some(closure_kind) = closure_fn_kind_ty.expect_ty().to_opt_closure_kind() else {
+            // We don't need to worry about the self type being an infer var.
+            return Err(NoSolution);
+        };
+        let Some(goal_kind) = goal_kind_ty.expect_ty().to_opt_closure_kind() else {
+            return Err(NoSolution);
+        };
+        if !closure_kind.extends(goal_kind) {
+            return Err(NoSolution);
+        }
+
+        let upvars_ty = ty::CoroutineClosureSignature::tupled_upvars_by_closure_kind(
+            ecx.tcx(),
+            goal_kind,
+            tupled_inputs_ty.expect_ty(),
+            tupled_upvars_ty.expect_ty(),
+            coroutine_captures_by_ref_ty.expect_ty(),
+            borrow_region.expect_region(),
+        );
+
+        ecx.eq(goal.param_env, goal.predicate.term.ty().unwrap(), upvars_ty)?;
+        ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
+    }
+
     fn consider_builtin_tuple_candidate(
         _ecx: &mut EvalCtxt<'_, 'tcx>,
         goal: Goal<'tcx, Self>,
@@ -391,6 +504,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for NormalizesTo<'tcx> {
                 | ty::FnDef(..)
                 | ty::FnPtr(..)
                 | ty::Closure(..)
+                | ty::CoroutineClosure(..)
                 | ty::Infer(ty::IntVar(..) | ty::FloatVar(..))
                 | ty::Coroutine(..)
                 | ty::CoroutineWitness(..)
@@ -627,6 +741,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for NormalizesTo<'tcx> {
             | ty::FnDef(..)
             | ty::FnPtr(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Infer(ty::IntVar(..) | ty::FloatVar(..))
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
diff --git a/compiler/rustc_trait_selection/src/solve/trait_goals.rs b/compiler/rustc_trait_selection/src/solve/trait_goals.rs
index b185e4e5f8eb0..fd09a6b671dad 100644
--- a/compiler/rustc_trait_selection/src/solve/trait_goals.rs
+++ b/compiler/rustc_trait_selection/src/solve/trait_goals.rs
@@ -303,6 +303,66 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
         Self::consider_implied_clause(ecx, goal, pred, [goal.with(tcx, output_is_sized_pred)])
     }
 
+    fn consider_builtin_async_fn_trait_candidates(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+        goal_kind: ty::ClosureKind,
+    ) -> QueryResult<'tcx> {
+        if goal.predicate.polarity != ty::ImplPolarity::Positive {
+            return Err(NoSolution);
+        }
+
+        let tcx = ecx.tcx();
+        let (tupled_inputs_and_output_and_coroutine, nested_preds) =
+            structural_traits::extract_tupled_inputs_and_output_from_async_callable(
+                tcx,
+                goal.predicate.self_ty(),
+                goal_kind,
+                // This region doesn't matter because we're throwing away the coroutine type
+                tcx.lifetimes.re_static,
+            )?;
+        let output_is_sized_pred =
+            tupled_inputs_and_output_and_coroutine.map_bound(|(_, output, _)| {
+                ty::TraitRef::from_lang_item(tcx, LangItem::Sized, DUMMY_SP, [output])
+            });
+
+        let pred = tupled_inputs_and_output_and_coroutine
+            .map_bound(|(inputs, _, _)| {
+                ty::TraitRef::new(tcx, goal.predicate.def_id(), [goal.predicate.self_ty(), inputs])
+            })
+            .to_predicate(tcx);
+        // A built-in `AsyncFn` impl only holds if the output is sized.
+        // (FIXME: technically we only need to check this if the type is a fn ptr...)
+        Self::consider_implied_clause(
+            ecx,
+            goal,
+            pred,
+            [goal.with(tcx, output_is_sized_pred)]
+                .into_iter()
+                .chain(nested_preds.into_iter().map(|pred| goal.with(tcx, pred))),
+        )
+    }
+
+    fn consider_builtin_async_fn_kind_helper_candidate(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> QueryResult<'tcx> {
+        let [closure_fn_kind_ty, goal_kind_ty] = **goal.predicate.trait_ref.args else {
+            bug!();
+        };
+
+        let Some(closure_kind) = closure_fn_kind_ty.expect_ty().to_opt_closure_kind() else {
+            // We don't need to worry about the self type being an infer var.
+            return Err(NoSolution);
+        };
+        let goal_kind = goal_kind_ty.expect_ty().to_opt_closure_kind().unwrap();
+        if closure_kind.extends(goal_kind) {
+            ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
+        } else {
+            Err(NoSolution)
+        }
+    }
+
     fn consider_builtin_tuple_candidate(
         ecx: &mut EvalCtxt<'_, 'tcx>,
         goal: Goal<'tcx, Self>,
@@ -950,7 +1010,8 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             | ty::Ref(_, _, _)
             | ty::FnDef(_, _)
             | ty::FnPtr(_)
-            | ty::Closure(_, _)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(_, _)
             | ty::CoroutineWitness(..)
             | ty::Never
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index c49185a52c7ef..4b20de2621924 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -863,7 +863,7 @@ where
                 }
             }
             ty::Error(_) => ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty)),
-            ty::Closure(did, ..) | ty::Coroutine(did, ..) => {
+            ty::Closure(did, ..) | ty::CoroutineClosure(did, ..) | ty::Coroutine(did, ..) => {
                 if self.def_id_is_local(did) {
                     ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty))
                 } else {
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
index a8715b0764f0a..1ac0f172ef4c3 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
@@ -959,9 +959,10 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
         obligation: &PredicateObligation<'tcx>,
         trait_ref: ty::PolyTraitRef<'tcx>,
     ) -> Option<ErrorGuaranteed> {
-        if let ty::Closure(closure_def_id, closure_args) = *trait_ref.self_ty().skip_binder().kind()
+        let self_ty = trait_ref.self_ty().skip_binder();
+        if let ty::Closure(closure_def_id, closure_args) = *self_ty.kind()
             && let Some(expected_kind) = self.tcx.fn_trait_kind_from_def_id(trait_ref.def_id())
-            && let Some(found_kind) = self.closure_kind(closure_args)
+            && let Some(found_kind) = self.closure_kind(self_ty)
             && !found_kind.extends(expected_kind)
             && let sig = closure_args.as_closure().sig()
             && self.can_sub(
@@ -1875,6 +1876,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 ty::Coroutine(..) => Some(18),
                 ty::Foreign(..) => Some(19),
                 ty::CoroutineWitness(..) => Some(20),
+                ty::CoroutineClosure(..) => Some(21),
                 ty::Placeholder(..) | ty::Bound(..) | ty::Infer(..) | ty::Error(_) => None,
             }
         }
@@ -1924,45 +1926,50 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
     fn describe_closure(&self, kind: hir::ClosureKind) -> &'static str {
         match kind {
             hir::ClosureKind::Closure => "a closure",
-            hir::ClosureKind::Coroutine(kind) => match kind {
-                hir::CoroutineKind::Coroutine(_) => "a coroutine",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::Async,
-                    hir::CoroutineSource::Block,
-                ) => "an async block",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::Async,
-                    hir::CoroutineSource::Fn,
-                ) => "an async function",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::Async,
-                    hir::CoroutineSource::Closure,
-                ) => "an async closure",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::AsyncGen,
-                    hir::CoroutineSource::Block,
-                ) => "an async gen block",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::AsyncGen,
-                    hir::CoroutineSource::Fn,
-                ) => "an async gen function",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::AsyncGen,
-                    hir::CoroutineSource::Closure,
-                ) => "an async gen closure",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::Gen,
-                    hir::CoroutineSource::Block,
-                ) => "a gen block",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::Gen,
-                    hir::CoroutineSource::Fn,
-                ) => "a gen function",
-                hir::CoroutineKind::Desugared(
-                    hir::CoroutineDesugaring::Gen,
-                    hir::CoroutineSource::Closure,
-                ) => "a gen closure",
-            },
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Coroutine(_)) => "a coroutine",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::Async,
+                hir::CoroutineSource::Block,
+            )) => "an async block",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::Async,
+                hir::CoroutineSource::Fn,
+            )) => "an async function",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::Async,
+                hir::CoroutineSource::Closure,
+            ))
+            | hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async) => {
+                "an async closure"
+            }
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::AsyncGen,
+                hir::CoroutineSource::Block,
+            )) => "an async gen block",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::AsyncGen,
+                hir::CoroutineSource::Fn,
+            )) => "an async gen function",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::AsyncGen,
+                hir::CoroutineSource::Closure,
+            ))
+            | hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::AsyncGen) => {
+                "an async gen closure"
+            }
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::Gen,
+                hir::CoroutineSource::Block,
+            )) => "a gen block",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::Gen,
+                hir::CoroutineSource::Fn,
+            )) => "a gen function",
+            hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                hir::CoroutineDesugaring::Gen,
+                hir::CoroutineSource::Closure,
+            ))
+            | hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Gen) => "a gen closure",
         }
     }
 
diff --git a/compiler/rustc_trait_selection/src/traits/project.rs b/compiler/rustc_trait_selection/src/traits/project.rs
index abbc2066eac16..955c81eee6be3 100644
--- a/compiler/rustc_trait_selection/src/traits/project.rs
+++ b/compiler/rustc_trait_selection/src/traits/project.rs
@@ -1833,10 +1833,28 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
                     lang_items.fn_trait(),
                     lang_items.fn_mut_trait(),
                     lang_items.fn_once_trait(),
+                    lang_items.async_fn_trait(),
+                    lang_items.async_fn_mut_trait(),
+                    lang_items.async_fn_once_trait(),
                 ].contains(&Some(trait_ref.def_id))
                 {
                     true
-                }else if lang_items.discriminant_kind_trait() == Some(trait_ref.def_id) {
+                } else if lang_items.async_fn_kind_helper() == Some(trait_ref.def_id) {
+                    // FIXME(async_closures): Validity constraints here could be cleaned up.
+                    if obligation.predicate.args.type_at(0).is_ty_var()
+                        || obligation.predicate.args.type_at(4).is_ty_var()
+                        || obligation.predicate.args.type_at(5).is_ty_var()
+                    {
+                        candidate_set.mark_ambiguous();
+                        true
+                    } else if obligation.predicate.args.type_at(0).to_opt_closure_kind().is_some()
+                        && obligation.predicate.args.type_at(1).to_opt_closure_kind().is_some()
+                    {
+                        true
+                    } else {
+                        false
+                    }
+                } else if lang_items.discriminant_kind_trait() == Some(trait_ref.def_id) {
                     match self_ty.kind() {
                         ty::Bool
                         | ty::Char
@@ -1854,6 +1872,7 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
                         | ty::FnPtr(..)
                         | ty::Dynamic(..)
                         | ty::Closure(..)
+                        | ty::CoroutineClosure(..)
                         | ty::Coroutine(..)
                         | ty::CoroutineWitness(..)
                         | ty::Never
@@ -1903,6 +1922,7 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
                         | ty::FnPtr(..)
                         | ty::Dynamic(..)
                         | ty::Closure(..)
+                        | ty::CoroutineClosure(..)
                         | ty::Coroutine(..)
                         | ty::CoroutineWitness(..)
                         | ty::Never
@@ -2059,6 +2079,10 @@ fn confirm_select_candidate<'cx, 'tcx>(
                 } else {
                     confirm_fn_pointer_candidate(selcx, obligation, data)
                 }
+            } else if selcx.tcx().async_fn_trait_kind_from_def_id(trait_def_id).is_some() {
+                confirm_async_closure_candidate(selcx, obligation, data)
+            } else if lang_items.async_fn_kind_helper() == Some(trait_def_id) {
+                confirm_async_fn_kind_helper_candidate(selcx, obligation, data)
             } else {
                 confirm_builtin_candidate(selcx, obligation, data)
             }
@@ -2419,6 +2443,173 @@ fn confirm_callable_candidate<'cx, 'tcx>(
     confirm_param_env_candidate(selcx, obligation, predicate, true)
 }
 
+fn confirm_async_closure_candidate<'cx, 'tcx>(
+    selcx: &mut SelectionContext<'cx, 'tcx>,
+    obligation: &ProjectionTyObligation<'tcx>,
+    mut nested: Vec<PredicateObligation<'tcx>>,
+) -> Progress<'tcx> {
+    let self_ty = selcx.infcx.shallow_resolve(obligation.predicate.self_ty());
+    let ty::CoroutineClosure(def_id, args) = *self_ty.kind() else {
+        unreachable!(
+            "expected coroutine-closure self type for coroutine-closure candidate, found {self_ty}"
+        )
+    };
+    let args = args.as_coroutine_closure();
+    let kind_ty = args.kind_ty();
+
+    let tcx = selcx.tcx();
+    let goal_kind =
+        tcx.async_fn_trait_kind_from_def_id(obligation.predicate.trait_def_id(tcx)).unwrap();
+
+    let async_fn_kind_helper_trait_def_id =
+        tcx.require_lang_item(LangItem::AsyncFnKindHelper, None);
+    nested.push(obligation.with(
+        tcx,
+        ty::TraitRef::new(
+            tcx,
+            async_fn_kind_helper_trait_def_id,
+            [kind_ty, Ty::from_closure_kind(tcx, goal_kind)],
+        ),
+    ));
+
+    let env_region = match goal_kind {
+        ty::ClosureKind::Fn | ty::ClosureKind::FnMut => obligation.predicate.args.region_at(2),
+        ty::ClosureKind::FnOnce => tcx.lifetimes.re_static,
+    };
+
+    let upvars_projection_def_id = tcx
+        .associated_items(async_fn_kind_helper_trait_def_id)
+        .filter_by_name_unhygienic(sym::Upvars)
+        .next()
+        .unwrap()
+        .def_id;
+
+    // FIXME(async_closures): Confirmation is kind of a mess here. Ideally,
+    // we'd short-circuit when we know that the goal_kind >= closure_kind, and not
+    // register a nested predicate or create a new projection ty here. But I'm too
+    // lazy to make this more efficient atm, and we can always tweak it later,
+    // since all this does is make the solver do more work.
+    //
+    // The code duplication due to the different length args is kind of weird, too.
+    //
+    // See the logic in `structural_traits` in the new solver to understand a bit
+    // more clearly how this *should* look.
+    let poly_cache_entry = args.coroutine_closure_sig().map_bound(|sig| {
+        let (projection_ty, term) = match tcx.item_name(obligation.predicate.def_id) {
+            sym::CallOnceFuture => {
+                let tupled_upvars_ty = Ty::new_projection(
+                    tcx,
+                    upvars_projection_def_id,
+                    [
+                        ty::GenericArg::from(kind_ty),
+                        Ty::from_closure_kind(tcx, goal_kind).into(),
+                        env_region.into(),
+                        sig.tupled_inputs_ty.into(),
+                        args.tupled_upvars_ty().into(),
+                        args.coroutine_captures_by_ref_ty().into(),
+                    ],
+                );
+                let coroutine_ty = sig.to_coroutine(
+                    tcx,
+                    args.parent_args(),
+                    Ty::from_closure_kind(tcx, goal_kind),
+                    tcx.coroutine_for_closure(def_id),
+                    tupled_upvars_ty,
+                );
+                (
+                    ty::AliasTy::new(
+                        tcx,
+                        obligation.predicate.def_id,
+                        [self_ty, sig.tupled_inputs_ty],
+                    ),
+                    coroutine_ty.into(),
+                )
+            }
+            sym::CallMutFuture | sym::CallFuture => {
+                let tupled_upvars_ty = Ty::new_projection(
+                    tcx,
+                    upvars_projection_def_id,
+                    [
+                        ty::GenericArg::from(kind_ty),
+                        Ty::from_closure_kind(tcx, goal_kind).into(),
+                        env_region.into(),
+                        sig.tupled_inputs_ty.into(),
+                        args.tupled_upvars_ty().into(),
+                        args.coroutine_captures_by_ref_ty().into(),
+                    ],
+                );
+                let coroutine_ty = sig.to_coroutine(
+                    tcx,
+                    args.parent_args(),
+                    Ty::from_closure_kind(tcx, goal_kind),
+                    tcx.coroutine_for_closure(def_id),
+                    tupled_upvars_ty,
+                );
+                (
+                    ty::AliasTy::new(
+                        tcx,
+                        obligation.predicate.def_id,
+                        [
+                            ty::GenericArg::from(self_ty),
+                            sig.tupled_inputs_ty.into(),
+                            env_region.into(),
+                        ],
+                    ),
+                    coroutine_ty.into(),
+                )
+            }
+            sym::Output => (
+                ty::AliasTy::new(tcx, obligation.predicate.def_id, [self_ty, sig.tupled_inputs_ty]),
+                sig.return_ty.into(),
+            ),
+            name => bug!("no such associated type: {name}"),
+        };
+        ty::ProjectionPredicate { projection_ty, term }
+    });
+
+    confirm_param_env_candidate(selcx, obligation, poly_cache_entry, true)
+        .with_addl_obligations(nested)
+}
+
+fn confirm_async_fn_kind_helper_candidate<'cx, 'tcx>(
+    selcx: &mut SelectionContext<'cx, 'tcx>,
+    obligation: &ProjectionTyObligation<'tcx>,
+    nested: Vec<PredicateObligation<'tcx>>,
+) -> Progress<'tcx> {
+    let [
+        // We already checked that the goal_kind >= closure_kind
+        _closure_kind_ty,
+        goal_kind_ty,
+        borrow_region,
+        tupled_inputs_ty,
+        tupled_upvars_ty,
+        coroutine_captures_by_ref_ty,
+    ] = **obligation.predicate.args
+    else {
+        bug!();
+    };
+
+    let predicate = ty::ProjectionPredicate {
+        projection_ty: ty::AliasTy::new(
+            selcx.tcx(),
+            obligation.predicate.def_id,
+            obligation.predicate.args,
+        ),
+        term: ty::CoroutineClosureSignature::tupled_upvars_by_closure_kind(
+            selcx.tcx(),
+            goal_kind_ty.expect_ty().to_opt_closure_kind().unwrap(),
+            tupled_inputs_ty.expect_ty(),
+            tupled_upvars_ty.expect_ty(),
+            coroutine_captures_by_ref_ty.expect_ty(),
+            borrow_region.expect_region(),
+        )
+        .into(),
+    };
+
+    confirm_param_env_candidate(selcx, obligation, ty::Binder::dummy(predicate), false)
+        .with_addl_obligations(nested)
+}
+
 fn confirm_param_env_candidate<'cx, 'tcx>(
     selcx: &mut SelectionContext<'cx, 'tcx>,
     obligation: &ProjectionTyObligation<'tcx>,
diff --git a/compiler/rustc_trait_selection/src/traits/query/dropck_outlives.rs b/compiler/rustc_trait_selection/src/traits/query/dropck_outlives.rs
index 79f03242c5876..6c8834f11f1eb 100644
--- a/compiler/rustc_trait_selection/src/traits/query/dropck_outlives.rs
+++ b/compiler/rustc_trait_selection/src/traits/query/dropck_outlives.rs
@@ -48,7 +48,11 @@ pub fn trivial_dropck_outlives<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool {
         // (T1..Tn) and closures have same properties as T1..Tn --
         // check if *all* of them are trivial.
         ty::Tuple(tys) => tys.iter().all(|t| trivial_dropck_outlives(tcx, t)),
+
         ty::Closure(_, args) => trivial_dropck_outlives(tcx, args.as_closure().tupled_upvars_ty()),
+        ty::CoroutineClosure(_, args) => {
+            trivial_dropck_outlives(tcx, args.as_coroutine_closure().tupled_upvars_ty())
+        }
 
         ty::Adt(def, _) => {
             if Some(def.did()) == tcx.lang_items().manually_drop() {
@@ -239,6 +243,22 @@ pub fn dtorck_constraint_for_ty_inner<'tcx>(
             Ok::<_, NoSolution>(())
         })?,
 
+        ty::CoroutineClosure(_, args) => {
+            rustc_data_structures::stack::ensure_sufficient_stack(|| {
+                for ty in args.as_coroutine_closure().upvar_tys() {
+                    dtorck_constraint_for_ty_inner(
+                        tcx,
+                        param_env,
+                        span,
+                        depth + 1,
+                        ty,
+                        constraints,
+                    )?;
+                }
+                Ok::<_, NoSolution>(())
+            })?
+        }
+
         ty::Coroutine(_, args) => {
             // rust-lang/rust#49918: types can be constructed, stored
             // in the interior, and sit idle when coroutine yields
diff --git a/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs b/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
index 12aea88e9b6a2..2258e7961038b 100644
--- a/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
@@ -117,10 +117,15 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                     self.assemble_iterator_candidates(obligation, &mut candidates);
                 } else if lang_items.async_iterator_trait() == Some(def_id) {
                     self.assemble_async_iterator_candidates(obligation, &mut candidates);
+                } else if lang_items.async_fn_kind_helper() == Some(def_id) {
+                    self.assemble_async_fn_kind_helper_candidates(obligation, &mut candidates);
                 }
 
+                // FIXME: Put these into `else if` blocks above, since they're built-in.
                 self.assemble_closure_candidates(obligation, &mut candidates);
+                self.assemble_async_closure_candidates(obligation, &mut candidates);
                 self.assemble_fn_pointer_candidates(obligation, &mut candidates);
+
                 self.assemble_candidates_from_impls(obligation, &mut candidates);
                 self.assemble_candidates_from_object_ty(obligation, &mut candidates);
             }
@@ -306,11 +311,12 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         // Okay to skip binder because the args on closure types never
         // touch bound regions, they just capture the in-scope
         // type/region parameters
-        match *obligation.self_ty().skip_binder().kind() {
-            ty::Closure(def_id, closure_args) => {
+        let self_ty = obligation.self_ty().skip_binder();
+        match *self_ty.kind() {
+            ty::Closure(def_id, _) => {
                 let is_const = self.tcx().is_const_fn_raw(def_id);
                 debug!(?kind, ?obligation, "assemble_unboxed_candidates");
-                match self.infcx.closure_kind(closure_args) {
+                match self.infcx.closure_kind(self_ty) {
                     Some(closure_kind) => {
                         debug!(?closure_kind, "assemble_unboxed_candidates");
                         if closure_kind.extends(kind) {
@@ -334,6 +340,61 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         }
     }
 
+    fn assemble_async_closure_candidates(
+        &mut self,
+        obligation: &PolyTraitObligation<'tcx>,
+        candidates: &mut SelectionCandidateSet<'tcx>,
+    ) {
+        let Some(goal_kind) =
+            self.tcx().async_fn_trait_kind_from_def_id(obligation.predicate.def_id())
+        else {
+            return;
+        };
+
+        match *obligation.self_ty().skip_binder().kind() {
+            ty::CoroutineClosure(_, args) => {
+                if let Some(closure_kind) =
+                    args.as_coroutine_closure().kind_ty().to_opt_closure_kind()
+                    && !closure_kind.extends(goal_kind)
+                {
+                    return;
+                }
+                candidates.vec.push(AsyncClosureCandidate);
+            }
+            ty::Infer(ty::TyVar(_)) => {
+                candidates.ambiguous = true;
+            }
+            _ => {}
+        }
+    }
+
+    fn assemble_async_fn_kind_helper_candidates(
+        &mut self,
+        obligation: &PolyTraitObligation<'tcx>,
+        candidates: &mut SelectionCandidateSet<'tcx>,
+    ) {
+        let self_ty = obligation.self_ty().skip_binder();
+        let target_kind_ty = obligation.predicate.skip_binder().trait_ref.args.type_at(1);
+
+        // `to_opt_closure_kind` is kind of ICEy when it sees non-int types.
+        if !(self_ty.is_integral() || self_ty.is_ty_var()) {
+            return;
+        }
+        if !(target_kind_ty.is_integral() || self_ty.is_ty_var()) {
+            return;
+        }
+
+        // Check that the self kind extends the goal kind. If it does,
+        // then there's nothing else to check.
+        if let Some(closure_kind) = self_ty.to_opt_closure_kind()
+            && let Some(goal_kind) = target_kind_ty.to_opt_closure_kind()
+        {
+            if closure_kind.extends(goal_kind) {
+                candidates.vec.push(AsyncFnKindHelperCandidate);
+            }
+        }
+    }
+
     /// Implements one of the `Fn()` family for a fn pointer.
     fn assemble_fn_pointer_candidates(
         &mut self,
@@ -488,7 +549,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 | ty::Slice(_)
                 | ty::RawPtr(_)
                 | ty::Ref(_, _, _)
-                | ty::Closure(_, _)
+                | ty::Closure(..)
+                | ty::CoroutineClosure(..)
                 | ty::Coroutine(_, _)
                 | ty::CoroutineWitness(..)
                 | ty::Never
@@ -623,7 +685,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 | ty::Ref(..)
                 | ty::FnDef(..)
                 | ty::FnPtr(_)
-                | ty::Closure(_, _)
+                | ty::Closure(..)
+                | ty::CoroutineClosure(..)
                 | ty::Coroutine(..)
                 | ty::Never
                 | ty::Tuple(_)
@@ -1000,6 +1063,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             | ty::Array(..)
             | ty::Slice(_)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::Tuple(_)
             | ty::CoroutineWitness(..) => {
@@ -1076,7 +1140,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             | ty::FnDef(_, _)
             | ty::FnPtr(_)
             | ty::Dynamic(_, _, _)
-            | ty::Closure(_, _)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(_, _)
             | ty::CoroutineWitness(..)
             | ty::Never
@@ -1139,6 +1204,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             | ty::Placeholder(..)
             | ty::Dynamic(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Never
diff --git a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
index 74f388e53a3c9..c9d06b0f67521 100644
--- a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
@@ -83,6 +83,15 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 ImplSource::Builtin(BuiltinImplSource::Misc, vtable_closure)
             }
 
+            AsyncClosureCandidate => {
+                let vtable_closure = self.confirm_async_closure_candidate(obligation)?;
+                ImplSource::Builtin(BuiltinImplSource::Misc, vtable_closure)
+            }
+
+            // No nested obligations or confirmation process. The checks that we do in
+            // candidate assembly are sufficient.
+            AsyncFnKindHelperCandidate => ImplSource::Builtin(BuiltinImplSource::Misc, vec![]),
+
             CoroutineCandidate => {
                 let vtable_coroutine = self.confirm_coroutine_candidate(obligation)?;
                 ImplSource::Builtin(BuiltinImplSource::Misc, vtable_coroutine)
@@ -869,6 +878,49 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         Ok(nested)
     }
 
+    #[instrument(skip(self), level = "debug")]
+    fn confirm_async_closure_candidate(
+        &mut self,
+        obligation: &PolyTraitObligation<'tcx>,
+    ) -> Result<Vec<PredicateObligation<'tcx>>, SelectionError<'tcx>> {
+        // Okay to skip binder because the args on closure types never
+        // touch bound regions, they just capture the in-scope
+        // type/region parameters.
+        let self_ty = self.infcx.shallow_resolve(obligation.self_ty().skip_binder());
+        let ty::CoroutineClosure(closure_def_id, args) = *self_ty.kind() else {
+            bug!("async closure candidate for non-coroutine-closure {:?}", obligation);
+        };
+
+        let trait_ref = args.as_coroutine_closure().coroutine_closure_sig().map_bound(|sig| {
+            ty::TraitRef::new(
+                self.tcx(),
+                obligation.predicate.def_id(),
+                [self_ty, sig.tupled_inputs_ty],
+            )
+        });
+
+        let mut nested = self.confirm_poly_trait_refs(obligation, trait_ref)?;
+
+        let goal_kind =
+            self.tcx().async_fn_trait_kind_from_def_id(obligation.predicate.def_id()).unwrap();
+        nested.push(obligation.with(
+            self.tcx(),
+            ty::TraitRef::from_lang_item(
+                self.tcx(),
+                LangItem::AsyncFnKindHelper,
+                obligation.cause.span,
+                [
+                    args.as_coroutine_closure().kind_ty(),
+                    Ty::from_closure_kind(self.tcx(), goal_kind),
+                ],
+            ),
+        ));
+
+        debug!(?closure_def_id, ?trait_ref, ?nested, "confirm closure candidate obligations");
+
+        Ok(nested)
+    }
+
     /// In the case of closure types and fn pointers,
     /// we currently treat the input type parameters on the trait as
     /// outputs. This means that when we have a match we have only
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index 6a6adcbb680ea..7f41c73b72f0d 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -1864,6 +1864,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 ImplCandidate(..)
                 | AutoImplCandidate
                 | ClosureCandidate { .. }
+                | AsyncClosureCandidate
+                | AsyncFnKindHelperCandidate
                 | CoroutineCandidate
                 | FutureCandidate
                 | IteratorCandidate
@@ -1894,6 +1896,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 ImplCandidate(_)
                 | AutoImplCandidate
                 | ClosureCandidate { .. }
+                | AsyncClosureCandidate
+                | AsyncFnKindHelperCandidate
                 | CoroutineCandidate
                 | FutureCandidate
                 | IteratorCandidate
@@ -1930,6 +1934,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 ImplCandidate(..)
                 | AutoImplCandidate
                 | ClosureCandidate { .. }
+                | AsyncClosureCandidate
+                | AsyncFnKindHelperCandidate
                 | CoroutineCandidate
                 | FutureCandidate
                 | IteratorCandidate
@@ -1946,6 +1952,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 ImplCandidate(..)
                 | AutoImplCandidate
                 | ClosureCandidate { .. }
+                | AsyncClosureCandidate
+                | AsyncFnKindHelperCandidate
                 | CoroutineCandidate
                 | FutureCandidate
                 | IteratorCandidate
@@ -2054,6 +2062,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
             (
                 ImplCandidate(_)
                 | ClosureCandidate { .. }
+                | AsyncClosureCandidate
+                | AsyncFnKindHelperCandidate
                 | CoroutineCandidate
                 | FutureCandidate
                 | IteratorCandidate
@@ -2066,6 +2076,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 | TraitAliasCandidate,
                 ImplCandidate(_)
                 | ClosureCandidate { .. }
+                | AsyncClosureCandidate
+                | AsyncFnKindHelperCandidate
                 | CoroutineCandidate
                 | FutureCandidate
                 | IteratorCandidate
@@ -2106,6 +2118,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
             | ty::CoroutineWitness(..)
             | ty::Array(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Never
             | ty::Dynamic(_, _, ty::DynStar)
             | ty::Error(_) => {
@@ -2227,6 +2240,9 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 }
             }
 
+            // FIXME(async_closures): These are never clone, for now.
+            ty::CoroutineClosure(_, _) => None,
+
             ty::Adt(..) | ty::Alias(..) | ty::Param(..) | ty::Placeholder(..) => {
                 // Fallback to whatever user-defined impls exist in this case.
                 None
@@ -2305,6 +2321,11 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 t.rebind(vec![ty])
             }
 
+            ty::CoroutineClosure(_, args) => {
+                let ty = self.infcx.shallow_resolve(args.as_coroutine_closure().tupled_upvars_ty());
+                t.rebind(vec![ty])
+            }
+
             ty::Coroutine(_, args) => {
                 let ty = self.infcx.shallow_resolve(args.as_coroutine().tupled_upvars_ty());
                 let witness = args.as_coroutine().witness();
diff --git a/compiler/rustc_trait_selection/src/traits/structural_match.rs b/compiler/rustc_trait_selection/src/traits/structural_match.rs
index d5a37e63d8765..89459f377dd2b 100644
--- a/compiler/rustc_trait_selection/src/traits/structural_match.rs
+++ b/compiler/rustc_trait_selection/src/traits/structural_match.rs
@@ -79,6 +79,9 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for Search<'tcx> {
             ty::Closure(..) => {
                 return ControlFlow::Break(ty);
             }
+            ty::CoroutineClosure(..) => {
+                return ControlFlow::Break(ty);
+            }
             ty::Coroutine(..) | ty::CoroutineWitness(..) => {
                 return ControlFlow::Break(ty);
             }
diff --git a/compiler/rustc_trait_selection/src/traits/wf.rs b/compiler/rustc_trait_selection/src/traits/wf.rs
index 0f8d9c6bf4bdb..b4f13ee95a652 100644
--- a/compiler/rustc_trait_selection/src/traits/wf.rs
+++ b/compiler/rustc_trait_selection/src/traits/wf.rs
@@ -727,6 +727,14 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
                     self.out.extend(obligations);
                 }
 
+                ty::CoroutineClosure(did, args) => {
+                    // See the above comments. The same apply to coroutine-closures.
+                    walker.skip_current_subtree();
+                    self.compute(args.as_coroutine_closure().tupled_upvars_ty().into());
+                    let obligations = self.nominal_obligations(did, args);
+                    self.out.extend(obligations);
+                }
+
                 ty::FnPtr(_) => {
                     // let the loop iterate into the argument/return
                     // types appearing in the fn signature
diff --git a/compiler/rustc_ty_utils/src/abi.rs b/compiler/rustc_ty_utils/src/abi.rs
index af26616831fd0..0542ef4ecf902 100644
--- a/compiler/rustc_ty_utils/src/abi.rs
+++ b/compiler/rustc_ty_utils/src/abi.rs
@@ -101,6 +101,49 @@ fn fn_sig_for_fn_abi<'tcx>(
                 bound_vars,
             )
         }
+        ty::CoroutineClosure(def_id, args) => {
+            let sig = args.as_coroutine_closure().coroutine_closure_sig();
+            let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
+                sig.bound_vars().iter().chain(iter::once(ty::BoundVariableKind::Region(ty::BrEnv))),
+            );
+            let br = ty::BoundRegion {
+                var: ty::BoundVar::from_usize(bound_vars.len() - 1),
+                kind: ty::BoundRegionKind::BrEnv,
+            };
+            let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
+
+            // When this `CoroutineClosure` comes from a `ConstructCoroutineInClosureShim`,
+            // make sure we respect the `target_kind` in that shim.
+            // FIXME(async_closures): This shouldn't be needed, and we should be populating
+            // a separate def-id for these bodies.
+            let mut kind = args.as_coroutine_closure().kind();
+            if let InstanceDef::ConstructCoroutineInClosureShim { target_kind, .. } = instance.def {
+                kind = target_kind;
+            }
+
+            let env_ty =
+                tcx.closure_env_ty(Ty::new_coroutine_closure(tcx, def_id, args), kind, env_region);
+
+            let sig = sig.skip_binder();
+            ty::Binder::bind_with_vars(
+                tcx.mk_fn_sig(
+                    iter::once(env_ty).chain([sig.tupled_inputs_ty]),
+                    sig.to_coroutine_given_kind_and_upvars(
+                        tcx,
+                        args.as_coroutine_closure().parent_args(),
+                        tcx.coroutine_for_closure(def_id),
+                        kind,
+                        env_region,
+                        args.as_coroutine_closure().tupled_upvars_ty(),
+                        args.as_coroutine_closure().coroutine_captures_by_ref_ty(),
+                    ),
+                    sig.c_variadic,
+                    sig.unsafety,
+                    sig.abi,
+                ),
+                bound_vars,
+            )
+        }
         ty::Coroutine(did, args) => {
             let coroutine_kind = tcx.coroutine_kind(did).unwrap();
             let sig = args.as_coroutine().sig();
@@ -112,6 +155,40 @@ fn fn_sig_for_fn_abi<'tcx>(
                 var: ty::BoundVar::from_usize(bound_vars.len() - 1),
                 kind: ty::BoundRegionKind::BrEnv,
             };
+
+            let mut ty = ty;
+            // When this `Closure` comes from a `CoroutineKindShim`,
+            // make sure we respect the `target_kind` in that shim.
+            // FIXME(async_closures): This shouldn't be needed, and we should be populating
+            // a separate def-id for these bodies.
+            if let InstanceDef::CoroutineKindShim { target_kind, .. } = instance.def {
+                // Grab the parent coroutine-closure. It has the same args for the purposes
+                // of substitution, so this will be okay to do.
+                let ty::CoroutineClosure(_, coroutine_closure_args) = *tcx
+                    .instantiate_and_normalize_erasing_regions(
+                        args,
+                        param_env,
+                        tcx.type_of(tcx.parent(did)),
+                    )
+                    .kind()
+                else {
+                    bug!("CoroutineKindShim comes from calling a coroutine-closure");
+                };
+                let coroutine_closure_args = coroutine_closure_args.as_coroutine_closure();
+                ty = tcx.instantiate_bound_regions_with_erased(
+                    coroutine_closure_args.coroutine_closure_sig().map_bound(|sig| {
+                        sig.to_coroutine_given_kind_and_upvars(
+                            tcx,
+                            coroutine_closure_args.parent_args(),
+                            did,
+                            target_kind,
+                            tcx.lifetimes.re_erased,
+                            coroutine_closure_args.tupled_upvars_ty(),
+                            coroutine_closure_args.coroutine_captures_by_ref_ty(),
+                        )
+                    }),
+                );
+            }
             let env_ty = Ty::new_mut_ref(tcx, ty::Region::new_bound(tcx, ty::INNERMOST, br), ty);
 
             let pin_did = tcx.require_lang_item(LangItem::Pin, None);
diff --git a/compiler/rustc_ty_utils/src/instance.rs b/compiler/rustc_ty_utils/src/instance.rs
index 2d76cf994e437..9faad10dd14df 100644
--- a/compiler/rustc_ty_utils/src/instance.rs
+++ b/compiler/rustc_ty_utils/src/instance.rs
@@ -38,6 +38,7 @@ fn resolve_instance<'tcx>(
                 debug!(" => nontrivial drop glue");
                 match *ty.kind() {
                     ty::Closure(..)
+                    | ty::CoroutineClosure(..)
                     | ty::Coroutine(..)
                     | ty::Tuple(..)
                     | ty::Adt(..)
@@ -215,6 +216,7 @@ fn resolve_associated_item<'tcx>(
                         ty::Coroutine(..)
                         | ty::CoroutineWitness(..)
                         | ty::Closure(..)
+                        | ty::CoroutineClosure(..)
                         | ty::Tuple(..) => {}
                         _ => return Ok(None),
                     };
@@ -281,6 +283,34 @@ fn resolve_associated_item<'tcx>(
                         tcx.item_name(trait_item_id)
                     ),
                 }
+            } else if let Some(target_kind) = tcx.async_fn_trait_kind_from_def_id(trait_ref.def_id)
+            {
+                match *rcvr_args.type_at(0).kind() {
+                    ty::CoroutineClosure(coroutine_closure_def_id, args) => {
+                        // If we're computing `AsyncFnOnce`/`AsyncFnMut` for a by-ref closure,
+                        // or `AsyncFnOnce` for a by-mut closure, then construct a new body that
+                        // has the right return types.
+                        //
+                        // Specifically, `AsyncFnMut` for a by-ref coroutine-closure just needs
+                        // to have its input and output types fixed (`&mut self` and returning
+                        // `i16` coroutine kind).
+                        if target_kind > args.as_coroutine_closure().kind() {
+                            Some(Instance {
+                                def: ty::InstanceDef::ConstructCoroutineInClosureShim {
+                                    coroutine_closure_def_id,
+                                    target_kind,
+                                },
+                                args,
+                            })
+                        } else {
+                            Some(Instance::new(coroutine_closure_def_id, args))
+                        }
+                    }
+                    _ => bug!(
+                        "no built-in definition for `{trait_ref}::{}` for non-lending-closure type",
+                        tcx.item_name(trait_item_id)
+                    ),
+                }
             } else {
                 Instance::try_resolve_item_for_coroutine(tcx, trait_item_id, trait_id, rcvr_args)
             }
diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index 2fc4bfd4aa31c..f20ded355b1cd 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -328,6 +328,17 @@ fn layout_of_uncached<'tcx>(
             )?
         }
 
+        ty::CoroutineClosure(_, args) => {
+            let tys = args.as_coroutine_closure().upvar_tys();
+            univariant(
+                &tys.iter()
+                    .map(|ty| Ok(cx.layout_of(ty)?.layout))
+                    .try_collect::<IndexVec<_, _>>()?,
+                &ReprOptions::default(),
+                StructKind::AlwaysSized,
+            )?
+        }
+
         ty::Tuple(tys) => {
             let kind =
                 if tys.len() == 0 { StructKind::AlwaysSized } else { StructKind::MaybeUnsized };
diff --git a/compiler/rustc_ty_utils/src/needs_drop.rs b/compiler/rustc_ty_utils/src/needs_drop.rs
index 08e5476ae43b7..7b3d2ab22cfa4 100644
--- a/compiler/rustc_ty_utils/src/needs_drop.rs
+++ b/compiler/rustc_ty_utils/src/needs_drop.rs
@@ -172,6 +172,12 @@ where
                         }
                     }
 
+                    ty::CoroutineClosure(_, args) => {
+                        for upvar in args.as_coroutine_closure().upvar_tys() {
+                            queue_type(self, upvar);
+                        }
+                    }
+
                     // Check for a `Drop` impl and whether this is a union or
                     // `ManuallyDrop`. If it's a struct or enum without a `Drop`
                     // impl then check whether the field types need `Drop`.
diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index 2158aacab03d8..60b1bbe8c2a5f 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -18,7 +18,9 @@ fn sized_constraint_for_ty<'tcx>(
 
     let result = match ty.kind() {
         Bool | Char | Int(..) | Uint(..) | Float(..) | RawPtr(..) | Ref(..) | FnDef(..)
-        | FnPtr(_) | Array(..) | Closure(..) | Coroutine(..) | Never => vec![],
+        | FnPtr(_) | Array(..) | Closure(..) | CoroutineClosure(..) | Coroutine(..) | Never => {
+            vec![]
+        }
 
         Str | Dynamic(..) | Slice(_) | Foreign(..) | Error(_) | CoroutineWitness(..) => {
             // these are never sized - return the target type
diff --git a/compiler/rustc_type_ir/src/ty_kind.rs b/compiler/rustc_type_ir/src/ty_kind.rs
index 859000fb6cb18..a4fe572067b03 100644
--- a/compiler/rustc_type_ir/src/ty_kind.rs
+++ b/compiler/rustc_type_ir/src/ty_kind.rs
@@ -202,6 +202,13 @@ pub enum TyKind<I: Interner> {
     /// `ClosureArgs` for more details.
     Closure(I::DefId, I::GenericArgs),
 
+    /// The anonymous type of a closure. Used to represent the type of `async |a| a`.
+    ///
+    /// Coroutine-closure args contain both the - potentially substituted - generic
+    /// parameters of its parent and some synthetic parameters. See the documentation
+    /// for `CoroutineClosureArgs` for more details.
+    CoroutineClosure(I::DefId, I::GenericArgs),
+
     /// The anonymous type of a coroutine. Used to represent the type of
     /// `|a| yield a`.
     ///
@@ -317,16 +324,17 @@ const fn tykind_discriminant<I: Interner>(value: &TyKind<I>) -> usize {
         FnPtr(_) => 13,
         Dynamic(..) => 14,
         Closure(_, _) => 15,
-        Coroutine(_, _) => 16,
-        CoroutineWitness(_, _) => 17,
-        Never => 18,
-        Tuple(_) => 19,
-        Alias(_, _) => 20,
-        Param(_) => 21,
-        Bound(_, _) => 22,
-        Placeholder(_) => 23,
-        Infer(_) => 24,
-        Error(_) => 25,
+        CoroutineClosure(_, _) => 16,
+        Coroutine(_, _) => 17,
+        CoroutineWitness(_, _) => 18,
+        Never => 19,
+        Tuple(_) => 20,
+        Alias(_, _) => 21,
+        Param(_) => 22,
+        Bound(_, _) => 23,
+        Placeholder(_) => 24,
+        Infer(_) => 25,
+        Error(_) => 26,
     }
 }
 
@@ -356,6 +364,7 @@ impl<I: Interner> PartialEq for TyKind<I> {
                 a_p == b_p && a_r == b_r && a_repr == b_repr
             }
             (Closure(a_d, a_s), Closure(b_d, b_s)) => a_d == b_d && a_s == b_s,
+            (CoroutineClosure(a_d, a_s), CoroutineClosure(b_d, b_s)) => a_d == b_d && a_s == b_s,
             (Coroutine(a_d, a_s), Coroutine(b_d, b_s)) => a_d == b_d && a_s == b_s,
             (CoroutineWitness(a_d, a_s), CoroutineWitness(b_d, b_s)) => a_d == b_d && a_s == b_s,
             (Tuple(a_t), Tuple(b_t)) => a_t == b_t,
@@ -430,6 +439,9 @@ impl<I: Interner> DebugWithInfcx<I> for TyKind<I> {
                 }
             },
             Closure(d, s) => f.debug_tuple("Closure").field(d).field(&this.wrap(s)).finish(),
+            CoroutineClosure(d, s) => {
+                f.debug_tuple("CoroutineClosure").field(d).field(&this.wrap(s)).finish()
+            }
             Coroutine(d, s) => f.debug_tuple("Coroutine").field(d).field(&this.wrap(s)).finish(),
             CoroutineWitness(d, s) => {
                 f.debug_tuple("CoroutineWitness").field(d).field(&this.wrap(s)).finish()
diff --git a/library/core/src/ops/async_function.rs b/library/core/src/ops/async_function.rs
index 965873f163eff..efbe9d164c3a7 100644
--- a/library/core/src/ops/async_function.rs
+++ b/library/core/src/ops/async_function.rs
@@ -106,3 +106,28 @@ mod impls {
         }
     }
 }
+
+mod internal_implementation_detail {
+    /// A helper trait that is used to enforce that the `ClosureKind` of a goal
+    /// is within the capabilities of a `CoroutineClosure`, and which allows us
+    /// to delay the projection of the tupled upvar types until after upvar
+    /// analysis is complete.
+    ///
+    /// The `Self` type is expected to be the `kind_ty` of the coroutine-closure,
+    /// and thus either `?0` or `i8`/`i16`/`i32` (see docs for `ClosureKind`
+    /// for an explanation of that). The `GoalKind` is also the same type, but
+    /// representing the kind of the trait that the closure is being called with.
+    #[cfg_attr(not(bootstrap), lang = "async_fn_kind_helper")]
+    trait AsyncFnKindHelper<GoalKind> {
+        // Projects a set of closure inputs (arguments), a region, and a set of upvars
+        // (by move and by ref) to the upvars that we expect the coroutine to have
+        // according to the `GoalKind` parameter above.
+        //
+        // The `Upvars` parameter should be the upvars of the parent coroutine-closure,
+        // and the `BorrowedUpvarsAsFnPtr` will be a function pointer that has the shape
+        // `for<'env> fn() -> (&'env T, ...)`. This allows us to represent the binder
+        // of the closure's self-capture, and these upvar types will be instantiated with
+        // the `'closure_env` region provided to the associated type.
+        type Upvars<'closure_env, Inputs, Upvars, BorrowedUpvarsAsFnPtr>;
+    }
+}
diff --git a/src/doc/unstable-book/src/library-features/async-fn-traits.md b/src/doc/unstable-book/src/library-features/async-fn-traits.md
new file mode 100644
index 0000000000000..e1c3f067e5b2b
--- /dev/null
+++ b/src/doc/unstable-book/src/library-features/async-fn-traits.md
@@ -0,0 +1,13 @@
+# `async_fn_traits`
+
+See Also: [`fn_traits`](../library-features/fn-traits.md)
+
+----
+
+The `async_fn_traits` feature allows for implementation of the [`AsyncFn*`] traits
+for creating custom closure-like types that return futures.
+
+[`AsyncFn*`]: ../../std/ops/trait.AsyncFn.html
+
+The main difference to the `Fn*` family of traits is that `AsyncFn` can return a future
+that borrows from itself (`FnOnce::Output` has no lifetime parameters, while `AsyncFn::CallFuture` does).
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index bd1d68e7074e1..3bac71dbc24e2 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -2286,6 +2286,7 @@ pub(crate) fn clean_middle_ty<'tcx>(
         }
 
         ty::Closure(..) => panic!("Closure"),
+        ty::CoroutineClosure(..) => panic!("CoroutineClosure"),
         ty::Coroutine(..) => panic!("Coroutine"),
         ty::Placeholder(..) => panic!("Placeholder"),
         ty::CoroutineWitness(..) => panic!("CoroutineWitness"),
diff --git a/src/librustdoc/passes/collect_intra_doc_links.rs b/src/librustdoc/passes/collect_intra_doc_links.rs
index a75d9bee30490..fe02611b5d449 100644
--- a/src/librustdoc/passes/collect_intra_doc_links.rs
+++ b/src/librustdoc/passes/collect_intra_doc_links.rs
@@ -503,6 +503,7 @@ impl<'a, 'tcx> LinkCollector<'a, 'tcx> {
             }
             ty::Alias(..)
             | ty::Closure(..)
+            | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Dynamic(..)
diff --git a/src/tools/clippy/clippy_lints/src/dereference.rs b/src/tools/clippy/clippy_lints/src/dereference.rs
index 8ff54dfcfa0dc..194cf69ea7ed0 100644
--- a/src/tools/clippy/clippy_lints/src/dereference.rs
+++ b/src/tools/clippy/clippy_lints/src/dereference.rs
@@ -881,6 +881,7 @@ impl TyCoercionStability {
                 | ty::Coroutine(..)
                 | ty::CoroutineWitness(..)
                 | ty::Closure(..)
+                | ty::CoroutineClosure(..)
                 | ty::Never
                 | ty::Tuple(_)
                 | ty::Alias(ty::Projection, _) => Self::Deref,
diff --git a/src/tools/clippy/clippy_lints/src/utils/author.rs b/src/tools/clippy/clippy_lints/src/utils/author.rs
index b26ebe5cee321..288df0fd663f0 100644
--- a/src/tools/clippy/clippy_lints/src/utils/author.rs
+++ b/src/tools/clippy/clippy_lints/src/utils/author.rs
@@ -490,6 +490,9 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
                             format!("ClosureKind::Coroutine(CoroutineKind::Coroutine(Movability::{movability:?})")
                         },
                     },
+                    ClosureKind::CoroutineClosure(desugaring) => format!(
+                        "ClosureKind::CoroutineClosure(CoroutineDesugaring::{desugaring:?})"
+                    ),
                 };
 
                 let ret_ty = match fn_decl.output {
diff --git a/src/tools/clippy/tests/ui/author/blocks.stdout b/src/tools/clippy/tests/ui/author/blocks.stdout
index 8c4d71e68f80f..579f137f861e1 100644
--- a/src/tools/clippy/tests/ui/author/blocks.stdout
+++ b/src/tools/clippy/tests/ui/author/blocks.stdout
@@ -40,10 +40,10 @@ if let ExprKind::Block(block, None) = expr.kind
 {
     // report your lint here
 }
-if let ExprKind::Closure { capture_clause: CaptureBy::Value { .. }, fn_decl: fn_decl, body: body_id, closure_kind: ClosureKind::Closure, .. } = expr.kind
+if let ExprKind::Closure { capture_clause: CaptureBy::Value { .. }, fn_decl: fn_decl, body: body_id, closure_kind: ClosureKind::CoroutineClosure(CoroutineDesugaring::Async), .. } = expr.kind
     && let FnRetTy::DefaultReturn(_) = fn_decl.output
     && expr1 = &cx.tcx.hir().body(body_id).value
-    && let ExprKind::Closure { capture_clause: CaptureBy::Value { .. }, fn_decl: fn_decl1, body: body_id1, closure_kind: ClosureKind::Coroutine(CoroutineKind::Desugared(CoroutineDesugaring::Async, CoroutineSource::Closure)), .. } = expr1.kind
+    && let ExprKind::Closure { capture_clause: CaptureBy::Ref, fn_decl: fn_decl1, body: body_id1, closure_kind: ClosureKind::Coroutine(CoroutineKind::Desugared(CoroutineDesugaring::Async, CoroutineSource::Closure)), .. } = expr1.kind
     && let FnRetTy::DefaultReturn(_) = fn_decl1.output
     && expr2 = &cx.tcx.hir().body(body_id1).value
     && let ExprKind::Block(block, None) = expr2.kind
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.panic-abort.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.panic-abort.mir
new file mode 100644
index 0000000000000..1fae40c5f4004
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.panic-abort.mir
@@ -0,0 +1,47 @@
+// MIR for `main::{closure#0}::{closure#0}::{closure#0}` 0 coroutine_by_move
+
+fn main::{closure#0}::{closure#0}::{closure#0}(_1: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10}, _2: ResumeTy) -> ()
+yields ()
+ {
+    debug _task_context => _2;
+    debug a => (_1.0: i32);
+    debug b => (_1.1: i32);
+    let mut _0: ();
+    let _3: i32;
+    scope 1 {
+        debug a => _3;
+        let _4: &i32;
+        scope 2 {
+            debug a => _4;
+            let _5: &i32;
+            scope 3 {
+                debug b => _5;
+            }
+        }
+    }
+
+    bb0: {
+        StorageLive(_3);
+        _3 = (_1.0: i32);
+        FakeRead(ForLet(None), _3);
+        StorageLive(_4);
+        _4 = &_3;
+        FakeRead(ForLet(None), _4);
+        StorageLive(_5);
+        _5 = &(_1.1: i32);
+        FakeRead(ForLet(None), _5);
+        _0 = const ();
+        StorageDead(_5);
+        StorageDead(_4);
+        StorageDead(_3);
+        drop(_1) -> [return: bb1, unwind: bb2];
+    }
+
+    bb1: {
+        return;
+    }
+
+    bb2 (cleanup): {
+        resume;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.panic-unwind.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.panic-unwind.mir
new file mode 100644
index 0000000000000..1fae40c5f4004
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.panic-unwind.mir
@@ -0,0 +1,47 @@
+// MIR for `main::{closure#0}::{closure#0}::{closure#0}` 0 coroutine_by_move
+
+fn main::{closure#0}::{closure#0}::{closure#0}(_1: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10}, _2: ResumeTy) -> ()
+yields ()
+ {
+    debug _task_context => _2;
+    debug a => (_1.0: i32);
+    debug b => (_1.1: i32);
+    let mut _0: ();
+    let _3: i32;
+    scope 1 {
+        debug a => _3;
+        let _4: &i32;
+        scope 2 {
+            debug a => _4;
+            let _5: &i32;
+            scope 3 {
+                debug b => _5;
+            }
+        }
+    }
+
+    bb0: {
+        StorageLive(_3);
+        _3 = (_1.0: i32);
+        FakeRead(ForLet(None), _3);
+        StorageLive(_4);
+        _4 = &_3;
+        FakeRead(ForLet(None), _4);
+        StorageLive(_5);
+        _5 = &(_1.1: i32);
+        FakeRead(ForLet(None), _5);
+        _0 = const ();
+        StorageDead(_5);
+        StorageDead(_4);
+        StorageDead(_3);
+        drop(_1) -> [return: bb1, unwind: bb2];
+    }
+
+    bb1: {
+        return;
+    }
+
+    bb2 (cleanup): {
+        resume;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.panic-abort.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.panic-abort.mir
new file mode 100644
index 0000000000000..9886d6f68a41c
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.panic-abort.mir
@@ -0,0 +1,47 @@
+// MIR for `main::{closure#0}::{closure#0}::{closure#0}` 0 coroutine_by_mut
+
+fn main::{closure#0}::{closure#0}::{closure#0}(_1: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10}, _2: ResumeTy) -> ()
+yields ()
+ {
+    debug _task_context => _2;
+    debug a => (_1.0: i32);
+    debug b => (*(_1.1: &i32));
+    let mut _0: ();
+    let _3: i32;
+    scope 1 {
+        debug a => _3;
+        let _4: &i32;
+        scope 2 {
+            debug a => _4;
+            let _5: &i32;
+            scope 3 {
+                debug b => _5;
+            }
+        }
+    }
+
+    bb0: {
+        StorageLive(_3);
+        _3 = (_1.0: i32);
+        FakeRead(ForLet(None), _3);
+        StorageLive(_4);
+        _4 = &_3;
+        FakeRead(ForLet(None), _4);
+        StorageLive(_5);
+        _5 = &(*(_1.1: &i32));
+        FakeRead(ForLet(None), _5);
+        _0 = const ();
+        StorageDead(_5);
+        StorageDead(_4);
+        StorageDead(_3);
+        drop(_1) -> [return: bb1, unwind: bb2];
+    }
+
+    bb1: {
+        return;
+    }
+
+    bb2 (cleanup): {
+        resume;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.panic-unwind.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.panic-unwind.mir
new file mode 100644
index 0000000000000..9886d6f68a41c
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.panic-unwind.mir
@@ -0,0 +1,47 @@
+// MIR for `main::{closure#0}::{closure#0}::{closure#0}` 0 coroutine_by_mut
+
+fn main::{closure#0}::{closure#0}::{closure#0}(_1: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10}, _2: ResumeTy) -> ()
+yields ()
+ {
+    debug _task_context => _2;
+    debug a => (_1.0: i32);
+    debug b => (*(_1.1: &i32));
+    let mut _0: ();
+    let _3: i32;
+    scope 1 {
+        debug a => _3;
+        let _4: &i32;
+        scope 2 {
+            debug a => _4;
+            let _5: &i32;
+            scope 3 {
+                debug b => _5;
+            }
+        }
+    }
+
+    bb0: {
+        StorageLive(_3);
+        _3 = (_1.0: i32);
+        FakeRead(ForLet(None), _3);
+        StorageLive(_4);
+        _4 = &_3;
+        FakeRead(ForLet(None), _4);
+        StorageLive(_5);
+        _5 = &(*(_1.1: &i32));
+        FakeRead(ForLet(None), _5);
+        _0 = const ();
+        StorageDead(_5);
+        StorageDead(_4);
+        StorageDead(_3);
+        drop(_1) -> [return: bb1, unwind: bb2];
+    }
+
+    bb1: {
+        return;
+    }
+
+    bb2 (cleanup): {
+        resume;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.panic-abort.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.panic-abort.mir
new file mode 100644
index 0000000000000..7df4eb492605b
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.panic-abort.mir
@@ -0,0 +1,10 @@
+// MIR for `main::{closure#0}::{closure#0}` 0 coroutine_closure_by_move
+
+fn main::{closure#0}::{closure#0}(_1: {coroutine-closure@$DIR/async_closure_shims.rs:39:33: 39:52}, _2: i32) -> {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10} {
+    let mut _0: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10};
+
+    bb0: {
+        _0 = {coroutine@$DIR/async_closure_shims.rs:39:53: 42:10 (#0)} { a: move _2, b: move (_1.0: i32) };
+        return;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.panic-unwind.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.panic-unwind.mir
new file mode 100644
index 0000000000000..7df4eb492605b
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.panic-unwind.mir
@@ -0,0 +1,10 @@
+// MIR for `main::{closure#0}::{closure#0}` 0 coroutine_closure_by_move
+
+fn main::{closure#0}::{closure#0}(_1: {coroutine-closure@$DIR/async_closure_shims.rs:39:33: 39:52}, _2: i32) -> {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10} {
+    let mut _0: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10};
+
+    bb0: {
+        _0 = {coroutine@$DIR/async_closure_shims.rs:39:53: 42:10 (#0)} { a: move _2, b: move (_1.0: i32) };
+        return;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.panic-abort.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.panic-abort.mir
new file mode 100644
index 0000000000000..517b8d0dd883b
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.panic-abort.mir
@@ -0,0 +1,16 @@
+// MIR for `main::{closure#0}::{closure#0}` 0 coroutine_closure_by_mut
+
+fn main::{closure#0}::{closure#0}(_1: &mut {coroutine-closure@$DIR/async_closure_shims.rs:39:33: 39:52}, _2: i32) -> {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10} {
+    debug a => _2;
+    debug b => ((*_1).0: i32);
+    let mut _0: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10};
+    let mut _3: &i32;
+
+    bb0: {
+        StorageLive(_3);
+        _3 = &((*_1).0: i32);
+        _0 = {coroutine@$DIR/async_closure_shims.rs:39:53: 42:10 (#0)} { a: _2, b: move _3 };
+        StorageDead(_3);
+        return;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.panic-unwind.mir b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.panic-unwind.mir
new file mode 100644
index 0000000000000..517b8d0dd883b
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.panic-unwind.mir
@@ -0,0 +1,16 @@
+// MIR for `main::{closure#0}::{closure#0}` 0 coroutine_closure_by_mut
+
+fn main::{closure#0}::{closure#0}(_1: &mut {coroutine-closure@$DIR/async_closure_shims.rs:39:33: 39:52}, _2: i32) -> {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10} {
+    debug a => _2;
+    debug b => ((*_1).0: i32);
+    let mut _0: {async closure body@$DIR/async_closure_shims.rs:39:53: 42:10};
+    let mut _3: &i32;
+
+    bb0: {
+        StorageLive(_3);
+        _3 = &((*_1).0: i32);
+        _0 = {coroutine@$DIR/async_closure_shims.rs:39:53: 42:10 (#0)} { a: _2, b: move _3 };
+        StorageDead(_3);
+        return;
+    }
+}
diff --git a/tests/mir-opt/async_closure_shims.rs b/tests/mir-opt/async_closure_shims.rs
new file mode 100644
index 0000000000000..ef3bdaaa145a3
--- /dev/null
+++ b/tests/mir-opt/async_closure_shims.rs
@@ -0,0 +1,46 @@
+// edition:2021
+// skip-filecheck
+// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+
+#![feature(async_closure, noop_waker, async_fn_traits)]
+
+use std::future::Future;
+use std::ops::{AsyncFnMut, AsyncFnOnce};
+use std::pin::pin;
+use std::task::*;
+
+pub fn block_on<T>(fut: impl Future<Output = T>) -> T {
+    let mut fut = pin!(fut);
+    let ctx = &mut Context::from_waker(Waker::noop());
+
+    loop {
+        match fut.as_mut().poll(ctx) {
+            Poll::Pending => {}
+            Poll::Ready(t) => break t,
+        }
+    }
+}
+
+async fn call_mut(f: &mut impl AsyncFnMut(i32)) {
+    f(0).await;
+}
+
+async fn call_once(f: impl AsyncFnOnce(i32)) {
+    f(1).await;
+}
+
+// EMIT_MIR async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_move.0.mir
+// EMIT_MIR async_closure_shims.main-{closure#0}-{closure#0}.coroutine_closure_by_mut.0.mir
+// EMIT_MIR async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_mut.0.mir
+// EMIT_MIR async_closure_shims.main-{closure#0}-{closure#0}-{closure#0}.coroutine_by_move.0.mir
+fn main() {
+    block_on(async {
+        let b = 2i32;
+        let mut async_closure = async move |a: i32| {
+            let a = &a;
+            let b = &b;
+        };
+        call_mut(&mut async_closure).await;
+        call_once(async_closure).await;
+    });
+}
diff --git a/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir b/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir
index 3c0d4008c9018..9c8cf8763fdf1 100644
--- a/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir
+++ b/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir
@@ -5,6 +5,7 @@
             ty: Coroutine(
                 DefId(0:4 ~ async_await[ccf8]::a::{closure#0}),
                 [
+                (),
                 std::future::ResumeTy,
                 (),
                 (),
@@ -22,6 +23,7 @@
             ty: Coroutine(
                 DefId(0:4 ~ async_await[ccf8]::a::{closure#0}),
                 [
+                (),
                 std::future::ResumeTy,
                 (),
                 (),
diff --git a/tests/ui-fulldeps/internal-lints/ty_tykind_usage.rs b/tests/ui-fulldeps/internal-lints/ty_tykind_usage.rs
index ae7f341fe4e33..cce223c77bbab 100644
--- a/tests/ui-fulldeps/internal-lints/ty_tykind_usage.rs
+++ b/tests/ui-fulldeps/internal-lints/ty_tykind_usage.rs
@@ -29,6 +29,7 @@ fn main() {
         TyKind::FnPtr(..) => (),            //~ ERROR usage of `ty::TyKind::<kind>`
         TyKind::Dynamic(..) => (),          //~ ERROR usage of `ty::TyKind::<kind>`
         TyKind::Closure(..) => (),          //~ ERROR usage of `ty::TyKind::<kind>`
+        TyKind::CoroutineClosure(..) => (), //~ ERROR usage of `ty::TyKind::<kind>`
         TyKind::Coroutine(..) => (),        //~ ERROR usage of `ty::TyKind::<kind>`
         TyKind::CoroutineWitness(..) => (), //~ ERROR usage of `ty::TyKind::<kind>`
         TyKind::Never => (),                //~ ERROR usage of `ty::TyKind::<kind>`
diff --git a/tests/ui-fulldeps/internal-lints/ty_tykind_usage.stderr b/tests/ui-fulldeps/internal-lints/ty_tykind_usage.stderr
index 45b7c26faad07..2ff5aad95dd87 100644
--- a/tests/ui-fulldeps/internal-lints/ty_tykind_usage.stderr
+++ b/tests/ui-fulldeps/internal-lints/ty_tykind_usage.stderr
@@ -109,71 +109,77 @@ LL |         TyKind::Closure(..) => (),
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:32:9
    |
-LL |         TyKind::Coroutine(..) => (),
+LL |         TyKind::CoroutineClosure(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:33:9
    |
-LL |         TyKind::CoroutineWitness(..) => (),
+LL |         TyKind::Coroutine(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:34:9
    |
-LL |         TyKind::Never => (),
+LL |         TyKind::CoroutineWitness(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:35:9
    |
-LL |         TyKind::Tuple(..) => (),
+LL |         TyKind::Never => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:36:9
    |
-LL |         TyKind::Alias(..) => (),
+LL |         TyKind::Tuple(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:37:9
    |
-LL |         TyKind::Param(..) => (),
+LL |         TyKind::Alias(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:38:9
    |
-LL |         TyKind::Bound(..) => (),
+LL |         TyKind::Param(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:39:9
    |
-LL |         TyKind::Placeholder(..) => (),
+LL |         TyKind::Bound(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:40:9
    |
-LL |         TyKind::Infer(..) => (),
+LL |         TyKind::Placeholder(..) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
   --> $DIR/ty_tykind_usage.rs:41:9
    |
+LL |         TyKind::Infer(..) => (),
+   |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
+
+error: usage of `ty::TyKind::<kind>`
+  --> $DIR/ty_tykind_usage.rs:42:9
+   |
 LL |         TyKind::Error(_) => (),
    |         ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind::<kind>`
-  --> $DIR/ty_tykind_usage.rs:46:12
+  --> $DIR/ty_tykind_usage.rs:47:12
    |
 LL |     if let TyKind::Int(int_ty) = kind {}
    |            ^^^^^^ help: try using `ty::<kind>` directly: `ty`
 
 error: usage of `ty::TyKind`
-  --> $DIR/ty_tykind_usage.rs:48:24
+  --> $DIR/ty_tykind_usage.rs:49:24
    |
 LL |     fn ty_kind(ty_bad: TyKind<'_>, ty_good: Ty<'_>) {}
    |                        ^^^^^^^^^^
@@ -181,7 +187,7 @@ LL |     fn ty_kind(ty_bad: TyKind<'_>, ty_good: Ty<'_>) {}
    = help: try using `Ty` instead
 
 error: usage of `ty::TyKind`
-  --> $DIR/ty_tykind_usage.rs:50:37
+  --> $DIR/ty_tykind_usage.rs:51:37
    |
 LL |     fn ir_ty_kind<I: Interner>(bad: IrTyKind<I>) -> IrTyKind<I> {
    |                                     ^^^^^^^^^^^
@@ -189,7 +195,7 @@ LL |     fn ir_ty_kind<I: Interner>(bad: IrTyKind<I>) -> IrTyKind<I> {
    = help: try using `Ty` instead
 
 error: usage of `ty::TyKind`
-  --> $DIR/ty_tykind_usage.rs:50:53
+  --> $DIR/ty_tykind_usage.rs:51:53
    |
 LL |     fn ir_ty_kind<I: Interner>(bad: IrTyKind<I>) -> IrTyKind<I> {
    |                                                     ^^^^^^^^^^^
@@ -197,12 +203,12 @@ LL |     fn ir_ty_kind<I: Interner>(bad: IrTyKind<I>) -> IrTyKind<I> {
    = help: try using `Ty` instead
 
 error: usage of `ty::TyKind::<kind>`
-  --> $DIR/ty_tykind_usage.rs:53:9
+  --> $DIR/ty_tykind_usage.rs:54:9
    |
 LL |         IrTyKind::Bool
    |         --------^^^^^^
    |         |
    |         help: try using `ty::<kind>` directly: `ty`
 
-error: aborting due to 32 previous errors
+error: aborting due to 33 previous errors
 
diff --git a/tests/ui/async-await/async-borrowck-escaping-closure-error.rs b/tests/ui/async-await/async-borrowck-escaping-closure-error.rs
index f8ff9186842b8..2a3e382e11868 100644
--- a/tests/ui/async-await/async-borrowck-escaping-closure-error.rs
+++ b/tests/ui/async-await/async-borrowck-escaping-closure-error.rs
@@ -1,10 +1,11 @@
 // edition:2018
-// check-pass
 
 #![feature(async_closure)]
 fn foo() -> Box<dyn std::future::Future<Output = u32>> {
     let x = 0u32;
     Box::new((async || x)())
+    //~^ ERROR cannot return value referencing local variable `x`
+    //~| ERROR cannot return value referencing temporary value
 }
 
 fn main() {
diff --git a/tests/ui/async-await/async-borrowck-escaping-closure-error.stderr b/tests/ui/async-await/async-borrowck-escaping-closure-error.stderr
new file mode 100644
index 0000000000000..be67c78221a7c
--- /dev/null
+++ b/tests/ui/async-await/async-borrowck-escaping-closure-error.stderr
@@ -0,0 +1,21 @@
+error[E0515]: cannot return value referencing local variable `x`
+  --> $DIR/async-borrowck-escaping-closure-error.rs:6:5
+   |
+LL |     Box::new((async || x)())
+   |     ^^^^^^^^^------------^^^
+   |     |        |
+   |     |        `x` is borrowed here
+   |     returns a value referencing data owned by the current function
+
+error[E0515]: cannot return value referencing temporary value
+  --> $DIR/async-borrowck-escaping-closure-error.rs:6:5
+   |
+LL |     Box::new((async || x)())
+   |     ^^^^^^^^^------------^^^
+   |     |        |
+   |     |        temporary value created here
+   |     returns a value referencing data owned by the current function
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0515`.
diff --git a/tests/ui/async-await/async-closures/arg-mismatch.rs b/tests/ui/async-await/async-closures/arg-mismatch.rs
new file mode 100644
index 0000000000000..650e13677bc95
--- /dev/null
+++ b/tests/ui/async-await/async-closures/arg-mismatch.rs
@@ -0,0 +1,15 @@
+// aux-build:block-on.rs
+// edition:2021
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let c = async |x| {};
+        c(1i32).await;
+        c(2usize).await;
+        //~^ ERROR mismatched types
+    });
+}
diff --git a/tests/ui/async-await/async-closures/arg-mismatch.stderr b/tests/ui/async-await/async-closures/arg-mismatch.stderr
new file mode 100644
index 0000000000000..70853ae28156f
--- /dev/null
+++ b/tests/ui/async-await/async-closures/arg-mismatch.stderr
@@ -0,0 +1,21 @@
+error[E0308]: mismatched types
+  --> $DIR/arg-mismatch.rs:12:11
+   |
+LL |         c(2usize).await;
+   |         - ^^^^^^ expected `i32`, found `usize`
+   |         |
+   |         arguments to this function are incorrect
+   |
+note: closure parameter defined here
+  --> $DIR/arg-mismatch.rs:10:24
+   |
+LL |         let c = async |x| {};
+   |                        ^
+help: change the type of the numeric literal from `usize` to `i32`
+   |
+LL |         c(2i32).await;
+   |            ~~~
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/async-await/async-closures/async-fn-mut-for-async-fn.rs b/tests/ui/async-await/async-closures/async-fn-mut-for-async-fn.rs
new file mode 100644
index 0000000000000..8d7dc6a276b90
--- /dev/null
+++ b/tests/ui/async-await/async-closures/async-fn-mut-for-async-fn.rs
@@ -0,0 +1,23 @@
+// aux-build:block-on.rs
+// edition:2021
+// run-pass
+
+// FIXME(async_closures): When `fn_sig_for_fn_abi` is fixed, remove this.
+// ignore-pass (test emits codegen-time warnings)
+
+#![feature(async_closure, async_fn_traits)]
+
+extern crate block_on;
+
+use std::ops::AsyncFnMut;
+
+fn main() {
+    block_on::block_on(async {
+        let x = async || {};
+
+        async fn needs_async_fn_mut(mut x: impl AsyncFnMut()) {
+            x().await;
+        }
+        needs_async_fn_mut(x).await;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/async-fn-once-for-async-fn.rs b/tests/ui/async-await/async-closures/async-fn-once-for-async-fn.rs
new file mode 100644
index 0000000000000..4afc43fe6bd92
--- /dev/null
+++ b/tests/ui/async-await/async-closures/async-fn-once-for-async-fn.rs
@@ -0,0 +1,23 @@
+// aux-build:block-on.rs
+// edition:2021
+// run-pass
+
+// FIXME(async_closures): When `fn_sig_for_fn_abi` is fixed, remove this.
+// ignore-pass (test emits codegen-time warnings)
+
+#![feature(async_closure, async_fn_traits)]
+
+extern crate block_on;
+
+use std::ops::AsyncFnOnce;
+
+fn main() {
+    block_on::block_on(async {
+        let x = async || {};
+
+        async fn needs_async_fn_once(x: impl AsyncFnOnce()) {
+            x().await;
+        }
+        needs_async_fn_once(x).await;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/auxiliary/block-on.rs b/tests/ui/async-await/async-closures/auxiliary/block-on.rs
new file mode 100644
index 0000000000000..3c27548b865a7
--- /dev/null
+++ b/tests/ui/async-await/async-closures/auxiliary/block-on.rs
@@ -0,0 +1,20 @@
+// edition: 2021
+
+#![feature(async_closure, noop_waker, async_fn_traits)]
+
+use std::future::Future;
+use std::pin::pin;
+use std::task::*;
+
+pub fn block_on<T>(fut: impl Future<Output = T>) -> T {
+    let mut fut = pin!(fut);
+    // Poll loop, just to test the future...
+    let ctx = &mut Context::from_waker(Waker::noop());
+
+    loop {
+        match unsafe { fut.as_mut().poll(ctx) } {
+            Poll::Pending => {}
+            Poll::Ready(t) => break t,
+        }
+    }
+}
diff --git a/tests/ui/async-await/async-closures/await-inference-guidance.rs b/tests/ui/async-await/async-closures/await-inference-guidance.rs
new file mode 100644
index 0000000000000..3702915cbadd1
--- /dev/null
+++ b/tests/ui/async-await/async-closures/await-inference-guidance.rs
@@ -0,0 +1,16 @@
+// aux-build:block-on.rs
+// edition:2021
+// run-pass
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let x = async |x: &str| -> String { x.to_owned() };
+        let mut s = x("hello, world").await;
+        s.truncate(4);
+        println!("{s}");
+    });
+}
diff --git a/tests/ui/async-await/async-closures/brand.rs b/tests/ui/async-await/async-closures/brand.rs
new file mode 100644
index 0000000000000..3bda7737bb406
--- /dev/null
+++ b/tests/ui/async-await/async-closures/brand.rs
@@ -0,0 +1,26 @@
+// aux-build:block-on.rs
+// edition:2021
+// build-pass
+
+#![feature(async_closure, async_fn_traits)]
+
+extern crate block_on;
+
+use std::future::Future;
+use std::marker::PhantomData;
+use std::ops::AsyncFn;
+
+struct S;
+struct B<'b>(PhantomData<&'b mut &'b mut ()>);
+
+impl S {
+    async fn q<F: AsyncFn(B<'_>)>(self, f: F) {
+        f(B(PhantomData)).await;
+    }
+}
+
+fn main() {
+    block_on::block_on(async {
+        S.q(async |b: B<'_>| { println!("...") }).await;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/def-path.rs b/tests/ui/async-await/async-closures/def-path.rs
index 2883a1715b0ac..87e99ddda64b3 100644
--- a/tests/ui/async-await/async-closures/def-path.rs
+++ b/tests/ui/async-await/async-closures/def-path.rs
@@ -8,7 +8,7 @@ fn main() {
     //~^ NOTE the expected `async` closure body
     let () = x();
     //~^ ERROR mismatched types
-    //~| NOTE this expression has type `{static main::{closure#0}::{closure#0} upvar_tys=
+    //~| NOTE this expression has type `{static main::{closure#0}::{closure#0}<
     //~| NOTE expected `async` closure body, found `()`
-    //~| NOTE expected `async` closure body `{static main::{closure#0}::{closure#0}
+    //~| NOTE expected `async` closure body `{static main::{closure#0}::{closure#0}<
 }
diff --git a/tests/ui/async-await/async-closures/def-path.stderr b/tests/ui/async-await/async-closures/def-path.stderr
index 4b37e50aac459..dae45825f370d 100644
--- a/tests/ui/async-await/async-closures/def-path.stderr
+++ b/tests/ui/async-await/async-closures/def-path.stderr
@@ -5,11 +5,11 @@ LL |     let x = async || {};
    |                      -- the expected `async` closure body
 LL |
 LL |     let () = x();
-   |         ^^   --- this expression has type `{static main::{closure#0}::{closure#0} upvar_tys=?7t witness=?8t}`
+   |         ^^   --- this expression has type `{static main::{closure#0}::{closure#0}<?7t> upvar_tys=?15t witness=?6t}`
    |         |
    |         expected `async` closure body, found `()`
    |
-   = note: expected `async` closure body `{static main::{closure#0}::{closure#0} upvar_tys=?7t witness=?8t}`
+   = note: expected `async` closure body `{static main::{closure#0}::{closure#0}<?7t> upvar_tys=?15t witness=?6t}`
                          found unit type `()`
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/async-await/async-closures/drop.rs b/tests/ui/async-await/async-closures/drop.rs
new file mode 100644
index 0000000000000..1b7f2f8a600d0
--- /dev/null
+++ b/tests/ui/async-await/async-closures/drop.rs
@@ -0,0 +1,40 @@
+// aux-build:block-on.rs
+// edition:2018
+// run-pass
+// check-run-results
+
+#![feature(async_closure, async_fn_traits)]
+#![allow(unused)]
+
+extern crate block_on;
+
+use std::ops::AsyncFnOnce;
+
+struct DropMe(i32);
+
+impl Drop for DropMe {
+    fn drop(&mut self) {
+        println!("{} was dropped", self.0);
+    }
+}
+
+async fn call_once(f: impl AsyncFnOnce()) {
+    println!("before call");
+    let fut = Box::pin(f());
+    println!("after call");
+    drop(fut);
+    println!("future dropped");
+}
+
+fn main() {
+    block_on::block_on(async {
+        let d = DropMe(42);
+        let async_closure = async move || {
+            let d = &d;
+            println!("called");
+        };
+
+        call_once(async_closure).await;
+        println!("after");
+    });
+}
diff --git a/tests/ui/async-await/async-closures/drop.run.stdout b/tests/ui/async-await/async-closures/drop.run.stdout
new file mode 100644
index 0000000000000..ab233f491ba65
--- /dev/null
+++ b/tests/ui/async-await/async-closures/drop.run.stdout
@@ -0,0 +1,5 @@
+before call
+after call
+42 was dropped
+future dropped
+after
diff --git a/tests/ui/async-await/async-closures/higher-ranked-return.rs b/tests/ui/async-await/async-closures/higher-ranked-return.rs
new file mode 100644
index 0000000000000..d98779c6ea320
--- /dev/null
+++ b/tests/ui/async-await/async-closures/higher-ranked-return.rs
@@ -0,0 +1,18 @@
+// aux-build:block-on.rs
+// edition:2021
+
+// known-bug: unknown
+// Borrow checking doesn't like that higher-ranked output...
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let x = async move |x: &str| -> &str {
+            x
+        };
+        let s = x("hello!").await;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/higher-ranked-return.stderr b/tests/ui/async-await/async-closures/higher-ranked-return.stderr
new file mode 100644
index 0000000000000..268631f67cddf
--- /dev/null
+++ b/tests/ui/async-await/async-closures/higher-ranked-return.stderr
@@ -0,0 +1,14 @@
+error: lifetime may not live long enough
+  --> $DIR/higher-ranked-return.rs:13:46
+   |
+LL |           let x = async move |x: &str| -> &str {
+   |  ________________________________-________----_^
+   | |                                |        |
+   | |                                |        return type of async closure `{async closure body@$DIR/higher-ranked-return.rs:13:46: 15:10}` contains a lifetime `'2`
+   | |                                let's call the lifetime of this reference `'1`
+LL | |             x
+LL | |         };
+   | |_________^ returning this value requires that `'1` must outlive `'2`
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/async-await/async-closures/higher-ranked.rs b/tests/ui/async-await/async-closures/higher-ranked.rs
index f0bdcf691ae2f..17b5116cceb02 100644
--- a/tests/ui/async-await/async-closures/higher-ranked.rs
+++ b/tests/ui/async-await/async-closures/higher-ranked.rs
@@ -1,12 +1,16 @@
+// aux-build:block-on.rs
 // edition:2021
+// build-pass
 
 #![feature(async_closure)]
 
+extern crate block_on;
+
 fn main() {
-    let x = async move |x: &str| {
-        //~^ ERROR lifetime may not live long enough
-        // This error is proof that the `&str` type is higher-ranked.
-        // This won't work until async closures are fully impl'd.
-        println!("{x}");
-    };
+    block_on::block_on(async {
+        let x = async move |x: &str| {
+            println!("{x}");
+        };
+        x("hello!").await;
+    });
 }
diff --git a/tests/ui/async-await/async-closures/higher-ranked.stderr b/tests/ui/async-await/async-closures/higher-ranked.stderr
deleted file mode 100644
index fb02a15b079d7..0000000000000
--- a/tests/ui/async-await/async-closures/higher-ranked.stderr
+++ /dev/null
@@ -1,17 +0,0 @@
-error: lifetime may not live long enough
-  --> $DIR/higher-ranked.rs:6:34
-   |
-LL |       let x = async move |x: &str| {
-   |  ____________________________-___-_^
-   | |                            |   |
-   | |                            |   return type of closure `{async closure body@$DIR/higher-ranked.rs:6:34: 11:6}` contains a lifetime `'2`
-   | |                            let's call the lifetime of this reference `'1`
-LL | |
-LL | |         // This error is proof that the `&str` type is higher-ranked.
-LL | |         // This won't work until async closures are fully impl'd.
-LL | |         println!("{x}");
-LL | |     };
-   | |_____^ returning this value requires that `'1` must outlive `'2`
-
-error: aborting due to 1 previous error
-
diff --git a/tests/ui/async-await/async-closures/is-not-fn.rs b/tests/ui/async-await/async-closures/is-not-fn.rs
new file mode 100644
index 0000000000000..94c8e8563bd9e
--- /dev/null
+++ b/tests/ui/async-await/async-closures/is-not-fn.rs
@@ -0,0 +1,12 @@
+// edition:2021
+
+#![feature(async_closure)]
+
+fn main() {
+    fn needs_fn(x: impl FnOnce()) {}
+    needs_fn(async || {});
+    //~^ ERROR expected a `FnOnce()` closure, found `{coroutine-closure@
+    // FIXME(async_closures): This should explain in more detail how async fns don't
+    // implement the regular `Fn` traits. Or maybe we should just fix it and make them
+    // when there are no upvars or whatever.
+}
diff --git a/tests/ui/async-await/async-closures/is-not-fn.stderr b/tests/ui/async-await/async-closures/is-not-fn.stderr
new file mode 100644
index 0000000000000..12da4b1fc6fb7
--- /dev/null
+++ b/tests/ui/async-await/async-closures/is-not-fn.stderr
@@ -0,0 +1,19 @@
+error[E0277]: expected a `FnOnce()` closure, found `{coroutine-closure@$DIR/is-not-fn.rs:7:14: 7:22}`
+  --> $DIR/is-not-fn.rs:7:14
+   |
+LL |     needs_fn(async || {});
+   |     -------- ^^^^^^^^^^^ expected an `FnOnce()` closure, found `{coroutine-closure@$DIR/is-not-fn.rs:7:14: 7:22}`
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: the trait `FnOnce<()>` is not implemented for `{coroutine-closure@$DIR/is-not-fn.rs:7:14: 7:22}`
+   = note: wrap the `{coroutine-closure@$DIR/is-not-fn.rs:7:14: 7:22}` in a closure with no arguments: `|| { /* code */ }`
+note: required by a bound in `needs_fn`
+  --> $DIR/is-not-fn.rs:6:25
+   |
+LL |     fn needs_fn(x: impl FnOnce()) {}
+   |                         ^^^^^^^^ required by this bound in `needs_fn`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/async-await/async-closures/mangle.rs b/tests/ui/async-await/async-closures/mangle.rs
new file mode 100644
index 0000000000000..98065c3c71109
--- /dev/null
+++ b/tests/ui/async-await/async-closures/mangle.rs
@@ -0,0 +1,36 @@
+// aux-build:block-on.rs
+// edition:2021
+// build-pass
+// revisions: v0 legacy
+//[v0] compile-flags: -Csymbol-mangling-version=v0
+//[legacy] compile-flags: -Csymbol-mangling-version=legacy -Zunstable-options
+
+// FIXME(async_closures): When `fn_sig_for_fn_abi` is fixed, remove this.
+// ignore-pass (test emits codegen-time warnings)
+
+#![feature(async_closure, noop_waker, async_fn_traits)]
+
+extern crate block_on;
+
+use std::future::Future;
+use std::ops::{AsyncFnMut, AsyncFnOnce};
+use std::pin::pin;
+use std::task::*;
+
+async fn call_mut(f: &mut impl AsyncFnMut()) {
+    f().await;
+}
+
+async fn call_once(f: impl AsyncFnOnce()) {
+    f().await;
+}
+
+fn main() {
+    block_on::block_on(async {
+        let mut async_closure = async move || {
+            println!("called");
+        };
+        call_mut(&mut async_closure).await;
+        call_once(async_closure).await;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/move-consuming-capture.rs b/tests/ui/async-await/async-closures/move-consuming-capture.rs
new file mode 100644
index 0000000000000..b8964c571f92e
--- /dev/null
+++ b/tests/ui/async-await/async-closures/move-consuming-capture.rs
@@ -0,0 +1,20 @@
+// aux-build:block-on.rs
+// edition:2021
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+struct NoCopy;
+
+fn main() {
+    block_on::block_on(async {
+        let s = NoCopy;
+        let x = async move || {
+            drop(s);
+        };
+        x().await;
+        x().await;
+        //~^ ERROR use of moved value: `x`
+    });
+}
diff --git a/tests/ui/async-await/async-closures/move-consuming-capture.stderr b/tests/ui/async-await/async-closures/move-consuming-capture.stderr
new file mode 100644
index 0000000000000..2c2a0d1162d17
--- /dev/null
+++ b/tests/ui/async-await/async-closures/move-consuming-capture.stderr
@@ -0,0 +1,17 @@
+error[E0382]: use of moved value: `x`
+  --> $DIR/move-consuming-capture.rs:17:9
+   |
+LL |         let x = async move || {
+   |             - move occurs because `x` has type `{coroutine-closure@$DIR/move-consuming-capture.rs:13:17: 13:30}`, which does not implement the `Copy` trait
+...
+LL |         x().await;
+   |         --- `x` moved due to this method call
+LL |         x().await;
+   |         ^ value used here after move
+   |
+note: `async_call_once` takes ownership of the receiver `self`, which moves `x`
+  --> $SRC_DIR/core/src/ops/async_function.rs:LL:COL
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0382`.
diff --git a/tests/ui/async-await/async-closures/move-is-async-fn.rs b/tests/ui/async-await/async-closures/move-is-async-fn.rs
new file mode 100644
index 0000000000000..943c062954185
--- /dev/null
+++ b/tests/ui/async-await/async-closures/move-is-async-fn.rs
@@ -0,0 +1,21 @@
+// aux-build:block-on.rs
+// edition:2021
+// build-pass
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let s = String::from("hello, world");
+        let c = async move || {
+            println!("{s}");
+        };
+        c().await;
+        c().await;
+
+        fn is_static<T: 'static>(_: T) {}
+        is_static(c);
+    });
+}
diff --git a/tests/ui/async-await/async-closures/mutate.rs b/tests/ui/async-await/async-closures/mutate.rs
new file mode 100644
index 0000000000000..cc1df5f034ff0
--- /dev/null
+++ b/tests/ui/async-await/async-closures/mutate.rs
@@ -0,0 +1,19 @@
+// aux-build:block-on.rs
+// edition:2021
+// run-pass
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let mut prefix = String::from("Hello");
+        let mut c = async move |x: &str| {
+            prefix.push(',');
+            println!("{prefix} {x}!")
+        };
+        c("world").await;
+        c("rust").await;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/not-lending.rs b/tests/ui/async-await/async-closures/not-lending.rs
new file mode 100644
index 0000000000000..90832e1a0745d
--- /dev/null
+++ b/tests/ui/async-await/async-closures/not-lending.rs
@@ -0,0 +1,21 @@
+// aux-build:block-on.rs
+// edition:2021
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+// Make sure that we can't make an async closure that evaluates to a self-borrow.
+// i.e. that the generator may reference captures, but the future's return type can't.
+
+fn main() {
+    block_on::block_on(async {
+        let s = String::new();
+        let x = async move || -> &String { &s };
+        //~^ ERROR lifetime may not live long enough
+
+        let s = String::new();
+        let x = async move || { &s };
+        //~^ ERROR lifetime may not live long enough
+    });
+}
diff --git a/tests/ui/async-await/async-closures/not-lending.stderr b/tests/ui/async-await/async-closures/not-lending.stderr
new file mode 100644
index 0000000000000..1713e49b551e6
--- /dev/null
+++ b/tests/ui/async-await/async-closures/not-lending.stderr
@@ -0,0 +1,24 @@
+error: lifetime may not live long enough
+  --> $DIR/not-lending.rs:14:42
+   |
+LL |         let x = async move || -> &String { &s };
+   |                 ------------------------ ^^^^^^ returning this value requires that `'1` must outlive `'2`
+   |                 |                |
+   |                 |                return type of async closure `{async closure body@$DIR/not-lending.rs:14:42: 14:48}` contains a lifetime `'2`
+   |                 lifetime `'1` represents this closure's body
+   |
+   = note: closure implements `Fn`, so references to captured variables can't escape the closure
+
+error: lifetime may not live long enough
+  --> $DIR/not-lending.rs:18:31
+   |
+LL |         let x = async move || { &s };
+   |                 ------------- ^^^^^^ returning this value requires that `'1` must outlive `'2`
+   |                 |           |
+   |                 |           return type of async closure `{async closure body@$DIR/not-lending.rs:18:31: 18:37}` contains a lifetime `'2`
+   |                 lifetime `'1` represents this closure's body
+   |
+   = note: closure implements `Fn`, so references to captured variables can't escape the closure
+
+error: aborting due to 2 previous errors
+
diff --git a/tests/ui/async-await/async-closures/return-type-mismatch.rs b/tests/ui/async-await/async-closures/return-type-mismatch.rs
new file mode 100644
index 0000000000000..9ad6be0b6e61e
--- /dev/null
+++ b/tests/ui/async-await/async-closures/return-type-mismatch.rs
@@ -0,0 +1,14 @@
+// aux-build:block-on.rs
+// edition:2021
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let x = async || -> i32 { 0 };
+        let y: usize = x().await;
+        //~^ ERROR mismatched types
+    });
+}
diff --git a/tests/ui/async-await/async-closures/return-type-mismatch.stderr b/tests/ui/async-await/async-closures/return-type-mismatch.stderr
new file mode 100644
index 0000000000000..53841f62777e6
--- /dev/null
+++ b/tests/ui/async-await/async-closures/return-type-mismatch.stderr
@@ -0,0 +1,14 @@
+error[E0308]: mismatched types
+  --> $DIR/return-type-mismatch.rs:11:24
+   |
+LL |         let y: usize = x().await;
+   |                        ^^^^^^^^^ expected `usize`, found `i32`
+   |
+help: you can convert an `i32` to a `usize` and panic if the converted value doesn't fit
+   |
+LL |         let y: usize = x().await.try_into().unwrap();
+   |                                 ++++++++++++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/async-await/async-closures/wrong-fn-kind.rs b/tests/ui/async-await/async-closures/wrong-fn-kind.rs
new file mode 100644
index 0000000000000..248288325319e
--- /dev/null
+++ b/tests/ui/async-await/async-closures/wrong-fn-kind.rs
@@ -0,0 +1,18 @@
+// edition:2021
+
+// FIXME(async_closures): This needs a better error message!
+
+#![feature(async_closure, async_fn_traits)]
+
+use std::ops::AsyncFn;
+
+fn main() {
+    fn needs_async_fn(_: impl AsyncFn()) {}
+
+    let mut x = 1;
+    needs_async_fn(async || {
+        //~^ ERROR i16: ops::async_function::internal_implementation_detail::AsyncFnKindHelper<i8>
+        // FIXME: Should say "closure is AsyncFnMut but it needs AsyncFn" or sth.
+        x += 1;
+    });
+}
diff --git a/tests/ui/async-await/async-closures/wrong-fn-kind.stderr b/tests/ui/async-await/async-closures/wrong-fn-kind.stderr
new file mode 100644
index 0000000000000..ef95e6a211c74
--- /dev/null
+++ b/tests/ui/async-await/async-closures/wrong-fn-kind.stderr
@@ -0,0 +1,22 @@
+error[E0277]: the trait bound `i16: ops::async_function::internal_implementation_detail::AsyncFnKindHelper<i8>` is not satisfied
+  --> $DIR/wrong-fn-kind.rs:13:20
+   |
+LL |       needs_async_fn(async || {
+   |  _____--------------_^
+   | |     |
+   | |     required by a bound introduced by this call
+LL | |
+LL | |         // FIXME: Should say "closure is AsyncFnMut but it needs AsyncFn" or sth.
+LL | |         x += 1;
+LL | |     });
+   | |_____^ the trait `ops::async_function::internal_implementation_detail::AsyncFnKindHelper<i8>` is not implemented for `i16`
+   |
+note: required by a bound in `needs_async_fn`
+  --> $DIR/wrong-fn-kind.rs:10:31
+   |
+LL |     fn needs_async_fn(_: impl AsyncFn()) {}
+   |                               ^^^^^^^^^ required by this bound in `needs_async_fn`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/async-await/issue-74072-lifetime-name-annotations.rs b/tests/ui/async-await/issue-74072-lifetime-name-annotations.rs
index 95683241aba26..904d28fb0a78d 100644
--- a/tests/ui/async-await/issue-74072-lifetime-name-annotations.rs
+++ b/tests/ui/async-await/issue-74072-lifetime-name-annotations.rs
@@ -12,6 +12,8 @@ pub async fn async_fn(x: &mut i32) -> &i32 {
 
 pub fn async_closure(x: &mut i32) -> impl Future<Output=&i32> {
     (async move || {
+        //~^ ERROR lifetime may not live long enough
+        //~| ERROR temporary value dropped while borrowed
         let y = &*x;
         *x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
         y
@@ -20,6 +22,8 @@ pub fn async_closure(x: &mut i32) -> impl Future<Output=&i32> {
 
 pub fn async_closure_explicit_return_type(x: &mut i32) -> impl Future<Output=&i32> {
     (async move || -> &i32 {
+        //~^ ERROR lifetime may not live long enough
+        //~| ERROR temporary value dropped while borrowed
         let y = &*x;
         *x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
         y
diff --git a/tests/ui/async-await/issue-74072-lifetime-name-annotations.stderr b/tests/ui/async-await/issue-74072-lifetime-name-annotations.stderr
index 628ba1a481893..bdf2820887c8b 100644
--- a/tests/ui/async-await/issue-74072-lifetime-name-annotations.stderr
+++ b/tests/ui/async-await/issue-74072-lifetime-name-annotations.stderr
@@ -11,7 +11,7 @@ LL |     y
    |     - returning this value requires that `*x` is borrowed for `'1`
 
 error[E0506]: cannot assign to `*x` because it is borrowed
-  --> $DIR/issue-74072-lifetime-name-annotations.rs:16:9
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:18:9
    |
 LL |         let y = &*x;
    |                 --- `*x` is borrowed here
@@ -22,20 +22,92 @@ LL |         y
 LL |     })()
    |     - return type of async closure is &'1 i32
 
+error: lifetime may not live long enough
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:14:20
+   |
+LL |       (async move || {
+   |  ______-------------_^
+   | |      |           |
+   | |      |           return type of async closure `{async closure body@$DIR/issue-74072-lifetime-name-annotations.rs:14:20: 20:6}` contains a lifetime `'2`
+   | |      lifetime `'1` represents this closure's body
+LL | |
+LL | |
+LL | |         let y = &*x;
+LL | |         *x += 1;
+LL | |         y
+LL | |     })()
+   | |_____^ returning this value requires that `'1` must outlive `'2`
+   |
+   = note: closure implements `FnMut`, so references to captured variables can't escape the closure
+
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:14:5
+   |
+LL |    pub fn async_closure(x: &mut i32) -> impl Future<Output=&i32> {
+   |                            - let's call the lifetime of this reference `'1`
+LL | //     (async move || {
+LL | ||
+LL | ||
+LL | ||         let y = &*x;
+LL | ||         *x += 1;
+LL | ||         y
+LL | ||     })()
+   | ||______^_- argument requires that borrow lasts for `'1`
+   | |_______|
+   |         creates a temporary value which is freed while still in use
+LL |    }
+   |    - temporary value is freed at the end of this statement
+
 error[E0506]: cannot assign to `*x` because it is borrowed
-  --> $DIR/issue-74072-lifetime-name-annotations.rs:24:9
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:28:9
    |
-LL |     (async move || -> &i32 {
-   |                       - let's call the lifetime of this reference `'1`
 LL |         let y = &*x;
    |                 --- `*x` is borrowed here
 LL |         *x += 1;
    |         ^^^^^^^ `*x` is assigned to here but it was already borrowed
 LL |         y
    |         - returning this value requires that `*x` is borrowed for `'1`
+LL |     })()
+   |     - return type of async closure is &'1 i32
+
+error: lifetime may not live long enough
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:24:28
+   |
+LL |       (async move || -> &i32 {
+   |  ______---------------------_^
+   | |      |                |
+   | |      |                return type of async closure `{async closure body@$DIR/issue-74072-lifetime-name-annotations.rs:24:28: 30:6}` contains a lifetime `'2`
+   | |      lifetime `'1` represents this closure's body
+LL | |
+LL | |
+LL | |         let y = &*x;
+LL | |         *x += 1;
+LL | |         y
+LL | |     })()
+   | |_____^ returning this value requires that `'1` must outlive `'2`
+   |
+   = note: closure implements `FnMut`, so references to captured variables can't escape the closure
+
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:24:5
+   |
+LL |    pub fn async_closure_explicit_return_type(x: &mut i32) -> impl Future<Output=&i32> {
+   |                                                 - let's call the lifetime of this reference `'1`
+LL | //     (async move || -> &i32 {
+LL | ||
+LL | ||
+LL | ||         let y = &*x;
+LL | ||         *x += 1;
+LL | ||         y
+LL | ||     })()
+   | ||______^_- argument requires that borrow lasts for `'1`
+   | |_______|
+   |         creates a temporary value which is freed while still in use
+LL |    }
+   |    - temporary value is freed at the end of this statement
 
 error[E0506]: cannot assign to `*x` because it is borrowed
-  --> $DIR/issue-74072-lifetime-name-annotations.rs:32:9
+  --> $DIR/issue-74072-lifetime-name-annotations.rs:36:9
    |
 LL |         let y = &*x;
    |                 --- `*x` is borrowed here
@@ -46,6 +118,7 @@ LL |         y
 LL |     }
    |     - return type of async block is &'1 i32
 
-error: aborting due to 4 previous errors
+error: aborting due to 8 previous errors
 
-For more information about this error, try `rustc --explain E0506`.
+Some errors have detailed explanations: E0506, E0716.
+For more information about an error, try `rustc --explain E0506`.
diff --git a/tests/ui/closures/binder/async-closure-with-binder.rs b/tests/ui/closures/binder/async-closure-with-binder.rs
index 4fa599d37cbd1..69d30f369e97d 100644
--- a/tests/ui/closures/binder/async-closure-with-binder.rs
+++ b/tests/ui/closures/binder/async-closure-with-binder.rs
@@ -1,8 +1,9 @@
 // edition:2021
+// check-pass
+
 #![feature(closure_lifetime_binder)]
 #![feature(async_closure)]
+
 fn main() {
-    for<'a> async || ();
-    //~^ ERROR `for<...>` binders on `async` closures are not currently supported
-    //~^^ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    for<'a> async || -> () {};
 }
diff --git a/tests/ui/closures/binder/async-closure-with-binder.stderr b/tests/ui/closures/binder/async-closure-with-binder.stderr
deleted file mode 100644
index 1d4628b1a494a..0000000000000
--- a/tests/ui/closures/binder/async-closure-with-binder.stderr
+++ /dev/null
@@ -1,16 +0,0 @@
-error: `for<...>` binders on `async` closures are not currently supported
-  --> $DIR/async-closure-with-binder.rs:5:5
-   |
-LL |     for<'a> async || ();
-   |     ^^^^^^^
-
-error: implicit types in closure signatures are forbidden when `for<...>` is present
-  --> $DIR/async-closure-with-binder.rs:5:5
-   |
-LL |     for<'a> async || ();
-   |     -------^^^^^^^^^
-   |     |
-   |     `for<...>` is here
-
-error: aborting due to 2 previous errors
-
diff --git a/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs b/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs
index a9d678c1e6aff..66a432be35737 100644
--- a/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs
+++ b/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs
@@ -9,7 +9,7 @@ impl Numberer {
     //~^ ERROR `async fn` is not permitted in Rust 2015
         interval: Duration,
         //~^ ERROR cannot find type `Duration` in this scope
-    ) -> Numberer { //~WARN: changes to closure capture in Rust 2021
+    ) -> Numberer {
         Numberer {}
     }
 }
diff --git a/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.stderr b/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.stderr
index 71e9e7602e8e7..60433e1c28467 100644
--- a/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.stderr
+++ b/tests/ui/span/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.stderr
@@ -18,32 +18,7 @@ help: consider importing this struct
 LL + use std::time::Duration;
    |
 
-warning: changes to closure capture in Rust 2021 will affect drop order
-  --> $DIR/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs:12:19
-   |
-LL |           interval: Duration,
-   |           -------- in Rust 2018, this causes the closure to capture `interval`, but in Rust 2021, it has no effect
-LL |
-LL |       ) -> Numberer {
-   |  _________________-_^
-   | |                 |
-   | |                 in Rust 2018, `interval` is dropped here along with the closure, but in Rust 2021 `interval` is not part of the closure
-LL | |         Numberer {}
-LL | |     }
-   | |_____^
-   |
-   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/disjoint-capture-in-closures.html>
-note: the lint level is defined here
-  --> $DIR/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs:1:9
-   |
-LL | #![warn(rust_2021_incompatible_closure_captures)]
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-help: add a dummy let to cause `interval` to be fully captured
-   |
-LL |     ) -> Numberer { let _ = &interval;
-   |                     ++++++++++++++++++
-
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0412, E0670.
 For more information about an error, try `rustc --explain E0412`.
diff --git a/tests/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr b/tests/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr
index 3065f83ea3d1b..dc4ec5d3ee28b 100644
--- a/tests/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr
+++ b/tests/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr
@@ -18,25 +18,21 @@ help: use parentheses to call this function
 LL |     bar(foo());
    |            ++
 
-error[E0277]: `{closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33}` is not a future
+error[E0277]: `{coroutine-closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33}` is not a future
   --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:12:9
    |
 LL |     bar(async_closure);
-   |     --- ^^^^^^^^^^^^^ `{closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33}` is not a future
+   |     --- ^^^^^^^^^^^^^ `{coroutine-closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33}` is not a future
    |     |
    |     required by a bound introduced by this call
    |
-   = help: the trait `Future` is not implemented for closure `{closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33}`
-   = note: {closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33} must be a future or must implement `IntoFuture` to be awaited
+   = help: the trait `Future` is not implemented for `{coroutine-closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33}`
+   = note: {coroutine-closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33} must be a future or must implement `IntoFuture` to be awaited
 note: required by a bound in `bar`
   --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:7:16
    |
 LL | fn bar(f: impl Future<Output=()>) {}
    |                ^^^^^^^^^^^^^^^^^ required by this bound in `bar`
-help: use parentheses to call this closure
-   |
-LL |     bar(async_closure());
-   |                      ++
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/symbol-names/basic.legacy.stderr b/tests/ui/symbol-names/basic.legacy.stderr
index 61d27ec69f4d2..c1cbefac828d6 100644
--- a/tests/ui/symbol-names/basic.legacy.stderr
+++ b/tests/ui/symbol-names/basic.legacy.stderr
@@ -1,10 +1,10 @@
-error: symbol-name(_ZN5basic4main17h9308686d0228fa1dE)
+error: symbol-name(_ZN5basic4main17h6fc0c8d27b1a289fE)
   --> $DIR/basic.rs:8:1
    |
 LL | #[rustc_symbol_name]
    | ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(basic::main::h9308686d0228fa1d)
+error: demangling(basic::main::h6fc0c8d27b1a289f)
   --> $DIR/basic.rs:8:1
    |
 LL | #[rustc_symbol_name]
diff --git a/tests/ui/symbol-names/issue-60925.legacy.stderr b/tests/ui/symbol-names/issue-60925.legacy.stderr
index eb65f3b58fff8..7dd68e6e3a8e2 100644
--- a/tests/ui/symbol-names/issue-60925.legacy.stderr
+++ b/tests/ui/symbol-names/issue-60925.legacy.stderr
@@ -1,10 +1,10 @@
-error: symbol-name(_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h84ab5dafbd2a1508E)
+error: symbol-name(_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17hab58a402db4ebf3aE)
   --> $DIR/issue-60925.rs:21:9
    |
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo::h84ab5dafbd2a1508)
+error: demangling(issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo::hab58a402db4ebf3a)
   --> $DIR/issue-60925.rs:21:9
    |
 LL |         #[rustc_symbol_name]