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Merged
merged 1 commit into from
Nov 24, 2023
Merged

intercrate ambiguity causes: ignore candidates which don't apply #118210

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6 changes: 4 additions & 2 deletions compiler/rustc_trait_selection/src/traits/coherence.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1050,8 +1050,10 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
let mut ambiguity_cause = None;
for cand in goal.candidates() {
// FIXME: boiiii, using string comparisions here sure is scuffed.
if let inspect::ProbeKind::MiscCandidate { name: "coherence unknowable", result: _ } =
cand.kind()
if let inspect::ProbeKind::MiscCandidate {
name: "coherence unknowable",
result: Ok(_),
} = cand.kind()
{
let lazily_normalize_ty = |ty: Ty<'tcx>| {
let mut fulfill_cx = <dyn TraitEngine<'tcx>>::new(infcx);
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8 changes: 4 additions & 4 deletions tests/ui/error-codes/E0476.stderr → tests/ui/error-codes/E0476.next.stderr
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
error[E0119]: conflicting implementations of trait `CoerceUnsized<&Wrapper<_>>` for type `&Wrapper<_>`
--> $DIR/E0476.rs:9:1
--> $DIR/E0476.rs:11:1
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Expand All @@ -9,18 +9,18 @@ LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S
where 'b: 'a, T: Unsize<U>, T: ?Sized, U: ?Sized;

error[E0476]: lifetime of the source pointer does not outlive lifetime bound of the object type
--> $DIR/E0476.rs:9:1
--> $DIR/E0476.rs:11:1
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: object type is valid for the lifetime `'a` as defined here
--> $DIR/E0476.rs:9:6
--> $DIR/E0476.rs:11:6
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^
note: source pointer is only valid for the lifetime `'b` as defined here
--> $DIR/E0476.rs:9:10
--> $DIR/E0476.rs:11:10
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^
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31 changes: 31 additions & 0 deletions tests/ui/error-codes/E0476.old.stderr
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@@ -0,0 +1,31 @@
error[E0119]: conflicting implementations of trait `CoerceUnsized<&Wrapper<_>>` for type `&Wrapper<_>`
--> $DIR/E0476.rs:11:1
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: conflicting implementation in crate `core`:
- impl<'a, 'b, T, U> CoerceUnsized<&'a U> for &'b T
where 'b: 'a, T: Unsize<U>, T: ?Sized, U: ?Sized;

error[E0476]: lifetime of the source pointer does not outlive lifetime bound of the object type
--> $DIR/E0476.rs:11:1
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: object type is valid for the lifetime `'a` as defined here
--> $DIR/E0476.rs:11:6
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^
note: source pointer is only valid for the lifetime `'b` as defined here
--> $DIR/E0476.rs:11:10
|
LL | impl<'a, 'b, T, S> CoerceUnsized<&'a Wrapper<T>> for &'b Wrapper<S> where S: Unsize<T> {}
| ^^

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0119, E0476.
For more information about an error, try `rustc --explain E0119`.
2 changes: 2 additions & 0 deletions tests/ui/error-codes/E0476.rs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
// revisions: old next
//[next] compile-flags: -Ztrait-solver=next-coherence
#![feature(coerce_unsized)]
#![feature(unsize)]

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