Note type mismatch on ConstArgHasType

rust-lang · Mar 20, 2023 · 2e7472f · 2e7472f
1 parent 7c2ee33
commit 2e7472f
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Showing 3 changed files with 14 additions and 4 deletions.
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
@@ -1282,10 +1282,20 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     ),
 
                     ty::PredicateKind::Clause(ty::Clause::ConstArgHasType(ct, ty)) => {
-                        self.tcx.sess.struct_span_err(
+                        let mut diag = self.tcx.sess.struct_span_err(
                             span,
                             &format!("the constant `{}` is not of type `{}`", ct, ty),
-                        )
+                        );
+                        self.note_type_err(
+                            &mut diag,
+                            &obligation.cause,
+                            None,
+                            None,
+                            TypeError::Sorts(ty::error::ExpectedFound::new(true, ty, ct.ty())),
+                            false,
+                            false,
+                        );
+                        diag
                     }
                 }
             }

diff --git a/tests/ui/const-generics/type_mismatch.stderr b/tests/ui/const-generics/type_mismatch.stderr
@@ -2,7 +2,7 @@ error: the constant `N` is not of type `u8`
   --> $DIR/type_mismatch.rs:2:11
    |
 LL |     bar::<N>()
-   |           ^
+   |           ^ expected `u8`, found `usize`
    |
 note: required by a bound in `bar`
   --> $DIR/type_mismatch.rs:6:8

diff --git a/tests/ui/transmutability/issue-101739-1.stderr b/tests/ui/transmutability/issue-101739-1.stderr
@@ -8,7 +8,7 @@ error: the constant `ASSUME_ALIGNMENT` is not of type `Assume`
   --> $DIR/issue-101739-1.rs:8:14
    |
 LL |         Dst: BikeshedIntrinsicFrom<Src, Context, ASSUME_ALIGNMENT>,
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Assume`, found `bool`
    |
 note: required by a bound in `BikeshedIntrinsicFrom`
   --> $SRC_DIR/core/src/mem/transmutability.rs:LL:COL