diff options
| -rw-r--r-- | compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs | 1 | ||||
| -rw-r--r-- | tests/ui/suggestions/raw-to-ref.fixed | 19 | ||||
| -rw-r--r-- | tests/ui/suggestions/raw-to-ref.rs | 19 | ||||
| -rw-r--r-- | tests/ui/suggestions/raw-to-ref.stderr | 25 |
4 files changed, 64 insertions, 0 deletions
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs index 39511ca30e0..53e055fdeef 100644 --- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs +++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs @@ -2682,6 +2682,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { if let hir::ExprKind::Unary(hir::UnOp::Deref, inner) = expr.kind && let Some(1) = self.deref_steps_for_suggestion(expected, checked_ty) + && self.typeck_results.borrow().expr_ty(inner).is_ref() { // We have `*&T`, check if what was expected was `&T`. // If so, we may want to suggest removing a `*`. diff --git a/tests/ui/suggestions/raw-to-ref.fixed b/tests/ui/suggestions/raw-to-ref.fixed new file mode 100644 index 00000000000..17d61e67e1f --- /dev/null +++ b/tests/ui/suggestions/raw-to-ref.fixed @@ -0,0 +1,19 @@ +//@ run-rustfix +// Regression test for #135580: check that we do not suggest to simply drop +// the `*` to make the types match when the source is a raw pointer while +// the target type is a reference. + +struct S; + +fn main() { + let mut s = S; + let x = &raw const s; + let _: &S = unsafe { &*x }; + //~^ ERROR mismatched types + //~| HELP consider borrowing here + + let x = &raw mut s; + let _: &mut S = unsafe { &mut *x }; + //~^ ERROR mismatched types + //~| HELP consider mutably borrowing here +} diff --git a/tests/ui/suggestions/raw-to-ref.rs b/tests/ui/suggestions/raw-to-ref.rs new file mode 100644 index 00000000000..2be8f881b5c --- /dev/null +++ b/tests/ui/suggestions/raw-to-ref.rs @@ -0,0 +1,19 @@ +//@ run-rustfix +// Regression test for #135580: check that we do not suggest to simply drop +// the `*` to make the types match when the source is a raw pointer while +// the target type is a reference. + +struct S; + +fn main() { + let mut s = S; + let x = &raw const s; + let _: &S = unsafe { *x }; + //~^ ERROR mismatched types + //~| HELP consider borrowing here + + let x = &raw mut s; + let _: &mut S = unsafe { *x }; + //~^ ERROR mismatched types + //~| HELP consider mutably borrowing here +} diff --git a/tests/ui/suggestions/raw-to-ref.stderr b/tests/ui/suggestions/raw-to-ref.stderr new file mode 100644 index 00000000000..ca358d268f0 --- /dev/null +++ b/tests/ui/suggestions/raw-to-ref.stderr @@ -0,0 +1,25 @@ +error[E0308]: mismatched types + --> $DIR/raw-to-ref.rs:11:26 + | +LL | let _: &S = unsafe { *x }; + | ^^ expected `&S`, found `S` + | +help: consider borrowing here + | +LL | let _: &S = unsafe { &*x }; + | + + +error[E0308]: mismatched types + --> $DIR/raw-to-ref.rs:16:30 + | +LL | let _: &mut S = unsafe { *x }; + | ^^ expected `&mut S`, found `S` + | +help: consider mutably borrowing here + | +LL | let _: &mut S = unsafe { &mut *x }; + | ++++ + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0308`. |