Remove lifetime_capture_rules_2024 feature

compiler/rustc_feature/src/removed.rs

@@ -135,6 +135,8 @@ declare_features! (
      Some("removed as it caused some confusion and discussion was inactive for years")),
     /// Lazily evaluate constants. This allows constants to depend on type parameters.
     (removed, lazy_normalization_consts, "1.46.0", Some(72219), Some("superseded by `generic_const_exprs`")),
+    /// Changes `impl Trait` to capture all lifetimes in scope.
+    (removed, lifetime_capture_rules_2024, "1.76.0", None, Some("unnecessary -- use edition 2024 instead")),
     /// Allows using the `#[link_args]` attribute.
     (removed, link_args, "1.53.0", Some(29596),
      Some("removed in favor of using `-C link-arg=ARG` on command line, \

compiler/rustc_feature/src/unstable.rs

@@ -214,8 +214,6 @@ declare_features! (
     (internal, intrinsics, "1.0.0", None),
     /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
     (internal, lang_items, "1.0.0", None),
-    /// Changes `impl Trait` to capture all lifetimes in scope.
-    (unstable, lifetime_capture_rules_2024, "1.76.0", None),
     /// Allows `#[link(..., cfg(..))]`; perma-unstable per #37406
     (internal, link_cfg, "1.14.0", None),
     /// Allows using `?Trait` trait bounds in more contexts.

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -305,21 +305,15 @@ fn generic_param_def_as_bound_arg(param: &ty::GenericParamDef) -> ty::BoundVaria
 }
 
 /// Whether this opaque always captures lifetimes in scope.
-/// Right now, this is all RPITIT and TAITs, and when `lifetime_capture_rules_2024`
-/// is enabled. We don't check the span of the edition, since this is done
-/// on a per-opaque basis to account for nested opaques.
-fn opaque_captures_all_in_scope_lifetimes<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    opaque: &'tcx hir::OpaqueTy<'tcx>,
-) -> bool {
+/// Right now, this is all RPITIT and TAITs, and when the opaque
+/// is coming from a span corresponding to edition 2024.
+fn opaque_captures_all_in_scope_lifetimes<'tcx>(opaque: &'tcx hir::OpaqueTy<'tcx>) -> bool {
     match opaque.origin {
         // if the opaque has the `use<...>` syntax, the user is telling us that they only want
         // to account for those lifetimes, so do not try to be clever.
         _ if opaque.bounds.iter().any(|bound| matches!(bound, hir::GenericBound::Use(..))) => false,
         hir::OpaqueTyOrigin::AsyncFn { .. } | hir::OpaqueTyOrigin::TyAlias { .. } => true,
-        _ if tcx.features().lifetime_capture_rules_2024() || opaque.span.at_least_rust_2024() => {
-            true
-        }
+        _ if opaque.span.at_least_rust_2024() => true,
         hir::OpaqueTyOrigin::FnReturn { in_trait_or_impl, .. } => in_trait_or_impl.is_some(),
     }
 }
@@ -519,8 +513,7 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
     fn visit_opaque_ty(&mut self, opaque: &'tcx rustc_hir::OpaqueTy<'tcx>) {
         let captures = RefCell::new(FxIndexMap::default());
 
-        let capture_all_in_scope_lifetimes =
-            opaque_captures_all_in_scope_lifetimes(self.tcx, opaque);
+        let capture_all_in_scope_lifetimes = opaque_captures_all_in_scope_lifetimes(opaque);
         if capture_all_in_scope_lifetimes {
             let lifetime_ident = |def_id: LocalDefId| {
                 let name = self.tcx.item_name(def_id.to_def_id());
@@ -2273,7 +2266,7 @@ fn is_late_bound_map(
     }
 
     let mut appears_in_output =
-        AllCollector { tcx, has_fully_capturing_opaque: false, regions: Default::default() };
+        AllCollector { has_fully_capturing_opaque: false, regions: Default::default() };
     intravisit::walk_fn_ret_ty(&mut appears_in_output, &sig.decl.output);
     if appears_in_output.has_fully_capturing_opaque {
         appears_in_output.regions.extend(generics.params.iter().map(|param| param.def_id));
@@ -2286,7 +2279,7 @@ fn is_late_bound_map(
     // Subtle point: because we disallow nested bindings, we can just
     // ignore binders here and scrape up all names we see.
     let mut appears_in_where_clause =
-        AllCollector { tcx, has_fully_capturing_opaque: true, regions: Default::default() };
+        AllCollector { has_fully_capturing_opaque: true, regions: Default::default() };
     appears_in_where_clause.visit_generics(generics);
     debug!(?appears_in_where_clause.regions);
 
@@ -2452,23 +2445,21 @@ fn is_late_bound_map(
         }
     }
 
-    struct AllCollector<'tcx> {
-        tcx: TyCtxt<'tcx>,
+    struct AllCollector {
         has_fully_capturing_opaque: bool,
         regions: FxHashSet<LocalDefId>,
     }
 
-    impl<'v> Visitor<'v> for AllCollector<'v> {
-        fn visit_lifetime(&mut self, lifetime_ref: &'v hir::Lifetime) {
+    impl<'tcx> Visitor<'tcx> for AllCollector {
+        fn visit_lifetime(&mut self, lifetime_ref: &'tcx hir::Lifetime) {
             if let hir::LifetimeName::Param(def_id) = lifetime_ref.res {
                 self.regions.insert(def_id);
             }
         }
 
-        fn visit_opaque_ty(&mut self, opaque: &'v hir::OpaqueTy<'v>) {
+        fn visit_opaque_ty(&mut self, opaque: &'tcx hir::OpaqueTy<'tcx>) {
             if !self.has_fully_capturing_opaque {
-                self.has_fully_capturing_opaque =
-                    opaque_captures_all_in_scope_lifetimes(self.tcx, opaque);
+                self.has_fully_capturing_opaque = opaque_captures_all_in_scope_lifetimes(opaque);
             }
             intravisit::walk_opaque_ty(self, opaque);
         }

compiler/rustc_lint/src/impl_trait_overcaptures.rs

@@ -86,8 +86,7 @@ declare_lint! {
     ///
     /// ### Example
     ///
-    /// ```rust,compile_fail
-    /// # #![feature(lifetime_capture_rules_2024)]
+    /// ```rust,edition2024,compile_fail
     /// # #![deny(impl_trait_redundant_captures)]
     /// fn test<'a>(x: &'a i32) -> impl Sized + use<'a> { x }
     /// ```
@@ -268,8 +267,7 @@ where
             && parent == self.parent_def_id
         {
             let opaque_span = self.tcx.def_span(opaque_def_id);
-            let new_capture_rules = opaque_span.at_least_rust_2024()
-                || self.tcx.features().lifetime_capture_rules_2024();
+            let new_capture_rules = opaque_span.at_least_rust_2024();
             if !new_capture_rules
                 && !opaque.bounds.iter().any(|bound| matches!(bound, hir::GenericBound::Use(..)))
             {

tests/ui/impl-trait/implicit-capture-late.rs

@@ -1,13 +1,13 @@
-//@ known-bug: #117647
+//@ edition: 2024
 
-#![feature(lifetime_capture_rules_2024)]
 #![feature(rustc_attrs)]
 #![allow(internal_features)]
 #![rustc_variance_of_opaques]
 
 use std::ops::Deref;
 
-fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> {
+fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> { //~ ['a: o]
+    //~^ ERROR cannot capture higher-ranked lifetime
     Box::new(x)
 }
 

tests/ui/impl-trait/implicit-capture-late.stderr

@@ -1,17 +1,17 @@
 error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from `dyn` type
-  --> $DIR/implicit-capture-late.rs:10:55
+  --> $DIR/implicit-capture-late.rs:9:55
    |
 LL | fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> {
    |                                                       ^^^^^^^^^^^ `impl Trait` implicitly captures all lifetimes in scope
    |
 note: lifetime declared here
-  --> $DIR/implicit-capture-late.rs:10:36
+  --> $DIR/implicit-capture-late.rs:9:36
    |
 LL | fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> {
    |                                    ^^
 
 error: ['a: o]
-  --> $DIR/implicit-capture-late.rs:10:55
+  --> $DIR/implicit-capture-late.rs:9:55
    |
 LL | fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> {
    |                                                       ^^^^^^^^^^^

tests/ui/impl-trait/precise-capturing/higher-ranked.rs

@@ -1,9 +1,8 @@
 //@ check-pass
+//@ edition: 2024
 
 // Show how precise captures allow us to skip capturing a higher-ranked lifetime
 
-#![feature(lifetime_capture_rules_2024)]
-
 trait Trait<'a> {
     type Item;
 }

tests/ui/impl-trait/precise-capturing/outlives.rs

@@ -1,9 +1,8 @@
 //@ check-pass
+//@ edition: 2024
 
 // Show that precise captures allow us to skip a lifetime param for outlives
 
-#![feature(lifetime_capture_rules_2024)]
-
 fn hello<'a: 'a, 'b: 'b>() -> impl Sized + use<'a> { }
 
 fn outlives<'a, T: 'a>(_: T) {}

tests/ui/impl-trait/variance.e2024.stderr

@@ -1,23 +1,23 @@
 error: ['a: *, 'a: o]
-  --> $DIR/variance.rs:13:36
+  --> $DIR/variance.rs:11:36
    |
 LL | fn not_captured_early<'a: 'a>() -> impl Sized {}
    |                                    ^^^^^^^^^^
 
 error: ['a: *, 'a: o]
-  --> $DIR/variance.rs:18:32
+  --> $DIR/variance.rs:15:32
    |
 LL | fn captured_early<'a: 'a>() -> impl Sized + Captures<'a> {}
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: ['a: o]
-  --> $DIR/variance.rs:20:40
+  --> $DIR/variance.rs:17:40
    |
 LL | fn not_captured_late<'a>(_: &'a ()) -> impl Sized {}
    |                                        ^^^^^^^^^^
 
 error: ['a: o]
-  --> $DIR/variance.rs:25:36
+  --> $DIR/variance.rs:21:36
    |
 LL | fn captured_late<'a>(_: &'a ()) -> impl Sized + Captures<'a> {}
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/impl-trait/variance.old.stderr

@@ -1,23 +1,23 @@
 error: ['a: *]
-  --> $DIR/variance.rs:13:36
+  --> $DIR/variance.rs:11:36
    |
 LL | fn not_captured_early<'a: 'a>() -> impl Sized {}
    |                                    ^^^^^^^^^^
 
 error: ['a: *, 'a: o]
-  --> $DIR/variance.rs:18:32
+  --> $DIR/variance.rs:15:32
    |
 LL | fn captured_early<'a: 'a>() -> impl Sized + Captures<'a> {}
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: []
-  --> $DIR/variance.rs:20:40
+  --> $DIR/variance.rs:17:40
    |
 LL | fn not_captured_late<'a>(_: &'a ()) -> impl Sized {}
    |                                        ^^^^^^^^^^
 
 error: ['a: o]
-  --> $DIR/variance.rs:25:36
+  --> $DIR/variance.rs:21:36
    |
 LL | fn captured_late<'a>(_: &'a ()) -> impl Sized + Captures<'a> {}
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/impl-trait/variance.rs

@@ -1,8 +1,6 @@
-//@ revisions: old new e2024
+//@ revisions: old e2024
 //@[e2024] edition: 2024
 
-#![cfg_attr(new, feature(lifetime_capture_rules_2024))]
-
 #![feature(rustc_attrs)]
 #![allow(internal_features)]
 #![rustc_variance_of_opaques]
@@ -12,15 +10,13 @@ impl<T> Captures<'_> for T {}
 
 fn not_captured_early<'a: 'a>() -> impl Sized {}
 //[old]~^ ['a: *]
-//[new]~^^ ['a: *, 'a: o]
-//[e2024]~^^^ ['a: *, 'a: o]
+//[e2024]~^^ ['a: *, 'a: o]
 
 fn captured_early<'a: 'a>() -> impl Sized + Captures<'a> {} //~ ['a: *, 'a: o]
 
 fn not_captured_late<'a>(_: &'a ()) -> impl Sized {}
 //[old]~^ []
-//[new]~^^ ['a: o]
-//[e2024]~^^^ ['a: o]
+//[e2024]~^^ ['a: o]
 
 fn captured_late<'a>(_: &'a ()) -> impl Sized + Captures<'a> {} //~ ['a: o]