Rollup merge of rust-lang#120390 - matthewjasper:inline-constant-pat-…

…mir, r=davidtwco

Borrow check inline const patterns

Add type annotations to MIR so that borrowck can pass constraints from inline constants in patterns to the containing function.
Also enables some inline constant pattern tests that were fixed by the THIR unsafeck stabilization.

cc rust-lang#76001

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -1099,10 +1099,17 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
     #[instrument(skip(self), level = "debug")]
     fn check_user_type_annotations(&mut self) {
         debug!(?self.user_type_annotations);
+        let tcx = self.tcx();
         for user_annotation in self.user_type_annotations {
             let CanonicalUserTypeAnnotation { span, ref user_ty, inferred_ty } = *user_annotation;
             let annotation = self.instantiate_canonical_with_fresh_inference_vars(span, user_ty);
-            self.ascribe_user_type(inferred_ty, annotation, span);
+            if let ty::UserType::TypeOf(def, args) = annotation
+                && let DefKind::InlineConst = tcx.def_kind(def)
+            {
+                self.check_inline_const(inferred_ty, def.expect_local(), args, span);
+            } else {
+                self.ascribe_user_type(inferred_ty, annotation, span);
+            }
         }
     }
 
@@ -1195,6 +1202,36 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         Ok(())
     }
 
+    fn check_inline_const(
+        &mut self,
+        inferred_ty: Ty<'tcx>,
+        def_id: LocalDefId,
+        args: UserArgs<'tcx>,
+        span: Span,
+    ) {
+        assert!(args.user_self_ty.is_none());
+        let tcx = self.tcx();
+        let const_ty = tcx.type_of(def_id).instantiate(tcx, args.args);
+        if let Err(terr) =
+            self.eq_types(const_ty, inferred_ty, Locations::All(span), ConstraintCategory::Boring)
+        {
+            span_bug!(
+                span,
+                "bad inline const pattern: ({:?} = {:?}) {:?}",
+                const_ty,
+                inferred_ty,
+                terr
+            );
+        }
+        let args = self.infcx.resolve_vars_if_possible(args.args);
+        let predicates = self.prove_closure_bounds(tcx, def_id, args, Locations::All(span));
+        self.normalize_and_prove_instantiated_predicates(
+            def_id.to_def_id(),
+            predicates,
+            Locations::All(span),
+        );
+    }
+
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
@@ -1851,7 +1888,12 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                     let def_id = uv.def;
                     if tcx.def_kind(def_id) == DefKind::InlineConst {
                         let def_id = def_id.expect_local();
-                        let predicates = self.prove_closure_bounds(tcx, def_id, uv.args, location);
+                        let predicates = self.prove_closure_bounds(
+                            tcx,
+                            def_id,
+                            uv.args,
+                            location.to_locations(),
+                        );
                         self.normalize_and_prove_instantiated_predicates(
                             def_id.to_def_id(),
                             predicates,
@@ -2654,9 +2696,15 @@ 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) => {
-                (def_id, self.prove_closure_bounds(tcx, def_id.expect_local(), args, location))
-            }
+            AggregateKind::Closure(def_id, args) | AggregateKind::Coroutine(def_id, args) => (
+                def_id,
+                self.prove_closure_bounds(
+                    tcx,
+                    def_id.expect_local(),
+                    args,
+                    location.to_locations(),
+                ),
+            ),
 
             AggregateKind::Array(_) | AggregateKind::Tuple => {
                 (CRATE_DEF_ID.to_def_id(), ty::InstantiatedPredicates::empty())
@@ -2675,7 +2723,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         tcx: TyCtxt<'tcx>,
         def_id: LocalDefId,
         args: GenericArgsRef<'tcx>,
-        location: Location,
+        locations: Locations,
     ) -> ty::InstantiatedPredicates<'tcx> {
         if let Some(closure_requirements) = &tcx.mir_borrowck(def_id).closure_requirements {
             constraint_conversion::ConstraintConversion::new(
@@ -2684,7 +2732,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 self.region_bound_pairs,
                 self.implicit_region_bound,
                 self.param_env,
-                location.to_locations(),
+                locations,
                 DUMMY_SP,                   // irrelevant; will be overridden.
                 ConstraintCategory::Boring, // same as above.
                 self.borrowck_context.constraints,
@@ -2710,7 +2758,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         if let Err(_) = self.eq_args(
             typeck_root_args,
             parent_args,
-            location.to_locations(),
+            locations,
             ConstraintCategory::BoringNoLocation,
         ) {
             span_mirbug!(

compiler/rustc_mir_build/src/build/matches/simplify.rs

@@ -15,7 +15,9 @@
 use crate::build::expr::as_place::PlaceBuilder;
 use crate::build::matches::{Ascription, Binding, Candidate, MatchPair};
 use crate::build::Builder;
+use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_middle::thir::{self, *};
+use rustc_middle::ty;
 
 use std::mem;
 
@@ -149,7 +151,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 ref subpattern,
                 ascription: thir::Ascription { ref annotation, variance },
             } => {
-                // Apply the type ascription to the value at `match_pair.place`, which is the
+                // Apply the type ascription to the value at `match_pair.place`
                 if let Some(source) = match_pair.place.try_to_place(self) {
                     candidate.ascriptions.push(Ascription {
                         annotation: annotation.clone(),
@@ -205,7 +207,38 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 Err(match_pair)
             }
 
-            PatKind::InlineConstant { subpattern: ref pattern, def: _ } => {
+            PatKind::InlineConstant { subpattern: ref pattern, def } => {
+                // Apply a type ascription for the inline constant to the value at `match_pair.place`
+                if let Some(source) = match_pair.place.try_to_place(self) {
+                    let span = match_pair.pattern.span;
+                    let parent_id = self.tcx.typeck_root_def_id(self.def_id.to_def_id());
+                    let args = ty::InlineConstArgs::new(
+                        self.tcx,
+                        ty::InlineConstArgsParts {
+                            parent_args: ty::GenericArgs::identity_for_item(self.tcx, parent_id),
+                            ty: self.infcx.next_ty_var(TypeVariableOrigin {
+                                kind: TypeVariableOriginKind::MiscVariable,
+                                span,
+                            }),
+                        },
+                    )
+                    .args;
+                    let user_ty =
+                        self.infcx.canonicalize_user_type_annotation(ty::UserType::TypeOf(
+                            def.to_def_id(),
+                            ty::UserArgs { args, user_self_ty: None },
+                        ));
+                    let annotation = ty::CanonicalUserTypeAnnotation {
+                        inferred_ty: pattern.ty,
+                        span,
+                        user_ty: Box::new(user_ty),
+                    };
+                    candidate.ascriptions.push(Ascription {
+                        annotation,
+                        source,
+                        variance: ty::Contravariant,
+                    });
+                }
                 candidate.match_pairs.push(MatchPair::new(match_pair.place, pattern, self));
 
                 Ok(())

tests/ui/inline-const/const-match-pat-lifetime-err.rs

@@ -1,5 +1,3 @@
-// ignore-test (This is currently broken)
-
 #![allow(incomplete_features)]
 #![feature(const_mut_refs)]
 #![feature(inline_const_pat)]
@@ -9,6 +7,9 @@ use std::marker::PhantomData;
 #[derive(PartialEq, Eq)]
 pub struct InvariantRef<'a, T: ?Sized>(&'a T, PhantomData<&'a mut &'a T>);
 
+#[derive(PartialEq, Eq)]
+pub struct CovariantRef<'a, T: ?Sized>(&'a T);
+
 impl<'a, T: ?Sized> InvariantRef<'a, T> {
     pub const fn new(r: &'a T) -> Self {
         InvariantRef(r, PhantomData)
@@ -19,16 +20,30 @@ impl<'a> InvariantRef<'a, ()> {
     pub const NEW: Self = InvariantRef::new(&());
 }
 
+impl<'a> CovariantRef<'a, ()> {
+    pub const NEW: Self = CovariantRef(&());
+}
+
 fn match_invariant_ref<'a>() {
     let y = ();
     match InvariantRef::new(&y) {
-    //~^ ERROR `y` does not live long enough [E0597]
-        // FIXME(nbdd0121): This should give the same error as `InvariantRef::<'a>::NEW` (without
-        // const block)
+        //~^ ERROR `y` does not live long enough [E0597]
         const { InvariantRef::<'a>::NEW } => (),
     }
 }
 
+fn match_covariant_ref<'a>() {
+    // Unclear if we should error here (should we be able to subtype the type of
+    // `y.0`), but using the associated const directly in the pattern also
+    // errors.
+    let y: (CovariantRef<'static, _>,) = (CovariantRef(&()),);
+    //~^ ERROR lifetime may not live long enough
+    match y.0 {
+        const { CovariantRef::<'a>::NEW } => (),
+    }
+}
+
 fn main() {
     match_invariant_ref();
+    match_covariant_ref();
 }

tests/ui/inline-const/const-match-pat-lifetime-err.stderr

@@ -0,0 +1,28 @@
+error[E0597]: `y` does not live long enough
+  --> $DIR/const-match-pat-lifetime-err.rs:29:29
+   |
+LL | fn match_invariant_ref<'a>() {
+   |                        -- lifetime `'a` defined here
+LL |     let y = ();
+   |         - binding `y` declared here
+LL |     match InvariantRef::new(&y) {
+   |                             ^^ borrowed value does not live long enough
+LL |
+LL |         const { InvariantRef::<'a>::NEW } => (),
+   |         --------------------------------- type annotation requires that `y` is borrowed for `'a`
+LL |     }
+LL | }
+   | - `y` dropped here while still borrowed
+
+error: lifetime may not live long enough
+  --> $DIR/const-match-pat-lifetime-err.rs:39:12
+   |
+LL | fn match_covariant_ref<'a>() {
+   |                        -- lifetime `'a` defined here
+...
+LL |     let y: (CovariantRef<'static, _>,) = (CovariantRef(&()),);
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0597`.

tests/ui/inline-const/pat-unsafe-err.rs

@@ -1,5 +1,3 @@
-// ignore-test This is currently broken
-
 #![allow(incomplete_features)]
 #![feature(inline_const_pat)]
 

tests/ui/inline-const/pat-unsafe-err.stderr

@@ -0,0 +1,19 @@
+error[E0133]: call to unsafe function `require_unsafe` is unsafe and requires unsafe function or block
+  --> $DIR/pat-unsafe-err.rs:11:13
+   |
+LL |             require_unsafe();
+   |             ^^^^^^^^^^^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error[E0133]: call to unsafe function `require_unsafe` is unsafe and requires unsafe function or block
+  --> $DIR/pat-unsafe-err.rs:18:13
+   |
+LL |             require_unsafe()
+   |             ^^^^^^^^^^^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0133`.

tests/ui/inline-const/pat-unsafe.rs

@@ -1,5 +1,4 @@
 // check-pass
-// ignore-test This is currently broken
 
 #![allow(incomplete_features)]
 #![warn(unused_unsafe)]

tests/ui/inline-const/pat-unsafe.stderr

@@ -0,0 +1,20 @@
+warning: unnecessary `unsafe` block
+  --> $DIR/pat-unsafe.rs:16:17
+   |
+LL |                 unsafe {}
+   |                 ^^^^^^ unnecessary `unsafe` block
+   |
+note: the lint level is defined here
+  --> $DIR/pat-unsafe.rs:4:9
+   |
+LL | #![warn(unused_unsafe)]
+   |         ^^^^^^^^^^^^^
+
+warning: unnecessary `unsafe` block
+  --> $DIR/pat-unsafe.rs:23:17
+   |
+LL |                 unsafe {}
+   |                 ^^^^^^ unnecessary `unsafe` block
+
+warning: 2 warnings emitted
+