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Matthias Krüger ffdb471872
Rollup merge of #117914 - estebank:issue-85843, r=wesleywiser 
On borrow return type, suggest borrowing from arg or owned return type

When we encounter a function with a return type that has an anonymous lifetime with no argument to borrow from, besides suggesting the `'static` lifetime we now also suggest changing the arguments to be borrows or changing the return type to be an owned type.

```
error[E0106]: missing lifetime specifier
  --> $DIR/variadic-ffi-6.rs:7:6
   |
LL | ) -> &usize {
   |      ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`
   |
LL | ) -> &'static usize {
   |       +++++++
help: instead, you are more likely to want to change one of the arguments to be borrowed...
   |
LL |     x: &usize,
   |        +
help: ...or alternatively, to want to return an owned value
   |
LL - ) -> &usize {
LL + ) -> usize {
   |
```

Fix #85843.
2023-12-12 17:40:53 +01:00
..
auxiliary
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cache
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associate-type-bound-normalization.rs
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associated-item-long-paths.rs
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associated-type-destructuring-assignment.rs
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associated-type-macro.rs
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associated-type-macro.stderr
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2023-11-24 19:15:52 +01:00
associated-type-projection-ambig-between-bound-and-where-clause.rs
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associated-type-projection-ambig-between-bound-and-where-clause.stderr
Unify suggestion wording
2023-10-17 17:33:55 +00:00
associated-type-projection-from-multiple-supertraits.rs
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associated-type-projection-from-multiple-supertraits.stderr
Sort errors
2023-10-30 22:19:17 +00:00
associated-type-projection-from-supertrait.rs
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associated-type-projection-from-supertrait.stderr
diagnostics: update test cases to refer to assoc fn with self as method
2023-02-22 08:40:47 -07:00
associated-type-shadowed-from-non-local-supertrait.rs
Point out shadowed associated types
2023-12-06 11:05:22 +01:00
associated-type-shadowed-from-non-local-supertrait.stderr
Point out shadowed associated types
2023-12-06 11:05:22 +01:00
associated-type-shadowed-from-supertrait.rs
Point out shadowed associated types
2023-12-06 11:05:22 +01:00
associated-type-shadowed-from-supertrait.stderr
Point out shadowed associated types
2023-12-06 11:05:22 +01:00
associated-type-struct-construction.rs
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associated-type-tuple-struct-construction.rs
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associated-type-tuple-struct-construction.stderr
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associated-types-basic.rs
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associated-types-binding-in-trait.rs
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associated-types-binding-in-where-clause.rs
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associated-types-binding-to-type-defined-in-supertrait.rs
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associated-types-binding-to-type-defined-in-supertrait.stderr
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associated-types-bound-ambiguity.rs
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associated-types-bound-failure.fixed
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associated-types-bound-failure.rs
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associated-types-bound-failure.stderr
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2023-11-24 19:15:52 +01:00
associated-types-bound.rs
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associated-types-cc.rs
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associated-types-coherence-failure.rs
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associated-types-coherence-failure.stderr
Extend impl's def_span to include where clauses
2023-10-09 11:47:02 +00:00
associated-types-conditional-dispatch.rs
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associated-types-constant-type.rs
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associated-types-doubleendediterator-object.rs
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associated-types-duplicate-binding-in-env-hrtb.rs
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associated-types-duplicate-binding-in-env.rs
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associated-types-enum-field-named.rs
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associated-types-enum-field-numbered.rs
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associated-types-eq-1.rs
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associated-types-eq-1.stderr
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associated-types-eq-2.rs
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associated-types-eq-2.stderr
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2023-11-24 19:15:52 +01:00
associated-types-eq-3.rs
Modify primary span label for E0308
2023-01-30 20:12:19 +00:00
associated-types-eq-3.stderr
Note base types of coercion
2023-05-12 00:10:52 +00:00
associated-types-eq-expr-path.rs
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associated-types-eq-expr-path.stderr
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2023-11-24 19:15:52 +01:00
associated-types-eq-hr.rs
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associated-types-eq-hr.stderr
Specify what 'this' actually is
2023-02-21 05:21:07 +00:00
associated-types-eq-obj.rs
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associated-types-for-unimpl-trait.fixed
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associated-types-for-unimpl-trait.rs
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associated-types-for-unimpl-trait.stderr
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2023-11-24 19:15:52 +01:00
associated-types-from-supertrait.rs
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associated-types-ICE-when-projecting-out-of-err.rs
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associated-types-ICE-when-projecting-out-of-err.stderr
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2023-11-24 19:15:52 +01:00
associated-types-impl-redirect.rs
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associated-types-in-ambiguous-context.rs
rustc_metadata: Filter encoded data more aggressively using DefKind
2023-04-10 16:24:36 +03:00
associated-types-in-ambiguous-context.stderr
Unify suggestion wording
2023-10-17 17:33:55 +00:00
associated-types-in-bound-type-arg.rs
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associated-types-in-default-method.rs
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associated-types-in-fn.rs
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associated-types-in-impl-generics.rs
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associated-types-in-inherent-method.rs
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associated-types-incomplete-object.rs
Detect object safety errors when assoc type is missing
2023-10-30 22:12:07 +00:00
associated-types-incomplete-object.stderr
Detect object safety errors when assoc type is missing
2023-10-30 22:12:07 +00:00
associated-types-invalid-trait-ref-issue-18865.rs
Remove unnecessary select_obligations_where_possible and redundant errors
2023-08-26 19:35:54 +00:00
associated-types-invalid-trait-ref-issue-18865.stderr
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associated-types-issue-17359.rs
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associated-types-issue-20220.rs
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associated-types-issue-20346.rs
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associated-types-issue-20371.rs
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associated-types-issue-21212.rs
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associated-types-iterator-binding.rs
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associated-types-method.rs
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associated-types-multiple-types-one-trait.rs
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associated-types-multiple-types-one-trait.stderr
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associated-types-nested-projections.rs
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associated-types-no-suitable-bound.rs
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associated-types-no-suitable-bound.stderr
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associated-types-no-suitable-supertrait-2.rs
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associated-types-no-suitable-supertrait-2.stderr
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2023-11-24 19:15:52 +01:00
associated-types-no-suitable-supertrait.rs
Work around the fact that check_mod_type_wf may spuriously return ErrorGuaranteed, even if that error is only emitted by check_modwitem_types
2023-10-25 12:04:54 +00:00
associated-types-no-suitable-supertrait.stderr
Work around the fact that check_mod_type_wf may spuriously return ErrorGuaranteed, even if that error is only emitted by check_modwitem_types
2023-10-25 12:04:54 +00:00
associated-types-normalize-in-bounds-binding.rs
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associated-types-normalize-in-bounds-ufcs.rs
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associated-types-normalize-in-bounds.rs
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associated-types-normalize-unifield-struct.rs
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associated-types-outlives.rs
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associated-types-outlives.stderr
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2023-11-24 19:15:52 +01:00
associated-types-overridden-binding-2.rs
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associated-types-overridden-binding.rs
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associated-types-overridden-binding.stderr
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associated-types-overridden-default.rs
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associated-types-path-1.rs
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associated-types-path-1.stderr
Unify suggestion wording
2023-10-17 17:33:55 +00:00
associated-types-path-2.rs
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associated-types-path-2.stderr
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associated-types-project-from-hrtb-in-fn-body.rs
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associated-types-project-from-hrtb-in-fn-body.stderr
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associated-types-project-from-hrtb-in-fn.fixed
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associated-types-project-from-hrtb-in-fn.rs
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associated-types-project-from-hrtb-in-fn.stderr
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associated-types-project-from-hrtb-in-struct.rs
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associated-types-project-from-hrtb-in-trait-method.fixed
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associated-types-project-from-hrtb-in-trait-method.rs
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associated-types-project-from-hrtb-in-trait-method.stderr
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associated-types-project-from-type-param-via-bound-in-where.rs
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associated-types-projection-bound-ambiguity.rs
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associated-types-projection-bound-in-supertraits.rs
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associated-types-projection-from-known-type-in-impl.rs
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associated-types-projection-in-object-type.rs
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associated-types-projection-in-supertrait.rs
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associated-types-projection-in-where-clause.rs
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associated-types-projection-to-unrelated-trait-in-method-without-default.fixed
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associated-types-projection-to-unrelated-trait-in-method-without-default.rs
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associated-types-projection-to-unrelated-trait-in-method-without-default.stderr
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associated-types-projection-to-unrelated-trait.rs
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associated-types-qualified-path-with-trait-with-type-parameters.rs
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associated-types-ref-from-struct.rs
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associated-types-ref-in-struct-literal.rs
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associated-types-region-erasure-issue-20582.rs
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associated-types-resolve-lifetime.rs
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associated-types-return.rs
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associated-types-simple.rs
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associated-types-stream.rs
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associated-types-struct-field-named.rs
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associated-types-struct-field-numbered.rs
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associated-types-subtyping-1.rs
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associated-types-subtyping-1.stderr
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associated-types-sugar-path.rs
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associated-types-unconstrained.rs
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associated-types-unconstrained.stderr
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2023-11-24 19:15:52 +01:00
associated-types-unsized.fixed
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associated-types-unsized.rs
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associated-types-unsized.stderr
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2023-11-24 19:15:52 +01:00
associated-types-where-clause-impl-ambiguity.rs
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bound-lifetime-constrained.clause.stderr
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bound-lifetime-constrained.func.stderr
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bound-lifetime-constrained.object.stderr
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bound-lifetime-constrained.rs
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bound-lifetime-in-binding-only.angle.stderr
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bound-lifetime-in-binding-only.elision.stderr
Rollup merge of #117914 - estebank:issue-85843, r=wesleywiser
2023-12-12 17:40:53 +01:00
bound-lifetime-in-binding-only.ok.stderr
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bound-lifetime-in-binding-only.paren.stderr
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bound-lifetime-in-binding-only.rs
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bound-lifetime-in-return-only.elision.stderr
Rollup merge of #117914 - estebank:issue-85843, r=wesleywiser
2023-12-12 17:40:53 +01:00
bound-lifetime-in-return-only.local.stderr
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bound-lifetime-in-return-only.rs
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bound-lifetime-in-return-only.sig.stderr
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bound-lifetime-in-return-only.structure.stderr
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2023-11-24 19:15:52 +01:00
default-associated-types.rs
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defaults-cyclic-fail-1.rs
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defaults-cyclic-fail-1.stderr
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defaults-cyclic-fail-2.rs
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defaults-cyclic-fail-2.stderr
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defaults-cyclic-pass-1.rs
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defaults-cyclic-pass-2.rs
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defaults-in-other-trait-items-pass.rs
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defaults-in-other-trait-items.rs
Use can_eq to compare types for default assoc type error
2023-01-25 21:25:42 +01:00
defaults-in-other-trait-items.stderr
Use can_eq to compare types for default assoc type error
2023-01-25 21:25:42 +01:00
defaults-mixed.rs
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defaults-mixed.stderr
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defaults-specialization.rs
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defaults-specialization.stderr
Tweak expected message to explain what it's actually signifying
2023-09-23 00:57:17 +00:00
defaults-suitability.rs
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defaults-suitability.stderr
Point out if a local trait has no implementations
2023-09-10 21:20:36 +00:00
defaults-unsound-62211-1.rs
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defaults-unsound-62211-1.stderr
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defaults-unsound-62211-2.rs
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defaults-unsound-62211-2.stderr
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defaults-wf.rs
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defaults-wf.stderr
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2023-11-24 19:15:52 +01:00
dont-suggest-cyclic-constraint.rs
Revert PR #114052 to fix invalid suggestion
2023-08-17 14:33:33 +02:00
dont-suggest-cyclic-constraint.stderr
recurse into refs when comparing tys for diagnostics
2023-12-07 23:00:46 -05:00
higher-ranked-projection.bad.stderr
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2023-11-24 19:15:52 +01:00
higher-ranked-projection.rs
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hr-associated-type-bound-1.rs
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hr-associated-type-bound-1.stderr
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hr-associated-type-bound-2.rs
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hr-associated-type-bound-2.stderr
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2023-11-24 19:15:52 +01:00
hr-associated-type-bound-object.rs
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hr-associated-type-bound-object.stderr
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2023-11-24 19:15:52 +01:00
hr-associated-type-bound-param-1.rs
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hr-associated-type-bound-param-1.stderr
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2023-11-24 19:15:52 +01:00
hr-associated-type-bound-param-2.rs
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hr-associated-type-bound-param-2.stderr
Add a note to duplicate diagnostics
2023-10-05 01:04:41 +00:00
hr-associated-type-bound-param-3.rs
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hr-associated-type-bound-param-3.stderr
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hr-associated-type-bound-param-4.rs
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hr-associated-type-bound-param-4.stderr
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2023-11-24 19:15:52 +01:00
hr-associated-type-bound-param-5.rs
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hr-associated-type-bound-param-5.stderr
Specify what 'this' actually is
2023-02-21 05:21:07 +00:00
hr-associated-type-bound-param-6.rs
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hr-associated-type-bound-param-6.stderr
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2023-11-24 19:15:52 +01:00
hr-associated-type-projection-1.rs
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hr-associated-type-projection-1.stderr
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2023-11-24 19:15:52 +01:00
impl-trait-return-missing-constraint.rs
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impl-trait-return-missing-constraint.stderr
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impl-wf-cycle-1.rs
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impl-wf-cycle-1.stderr
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impl-wf-cycle-2.rs
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impl-wf-cycle-2.stderr
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2023-11-24 19:15:52 +01:00
issue-18655.rs
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issue-19081.rs
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issue-19883.rs
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issue-20005.rs
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issue-20825-2.rs
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issue-21363.rs
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issue-21726.rs
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issue-22037.rs
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issue-22066.rs
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issue-22560.rs
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2023-10-30 22:19:17 +00:00
issue-22828.rs
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issue-23208.rs
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issue-23595-1.rs
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issue-24159.rs
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issue-24204.rs
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issue-25700-1.rs
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2023-11-24 19:15:52 +01:00
issue-26681.rs
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2023-11-24 19:15:52 +01:00
issue-27675-unchecked-bounds.rs
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issue-27675-unchecked-bounds.stderr
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2023-11-24 19:15:52 +01:00
issue-27901.rs
Move test files
2023-04-20 15:06:17 -03:00
issue-28871.rs
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issue-31597.rs
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issue-32323.rs
Move tests
2023-08-28 17:47:37 -03:00
issue-32323.stderr
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issue-32350.rs
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issue-36499.rs
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issue-37808.rs
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issue-37883.rs
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issue-38821.rs
Move tests
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issue-38821.stderr
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issue-38917.rs
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issue-39532.rs
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issue-40093.rs
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issue-41868.rs
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issue-43475.rs
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issue-43784-associated-type.rs
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issue-43784-associated-type.stderr
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2023-11-24 19:15:52 +01:00
issue-43924.rs
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issue-43924.stderr
Tweak use of trimmed paths
2023-01-30 20:12:21 +00:00
issue-44153.rs
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2023-11-24 19:15:52 +01:00
issue-47139-1.rs
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issue-47385.rs
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issue-48010.rs
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issue-50301.rs
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2023-11-24 19:15:52 +01:00
issue-54182-1.rs
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issue-54467.rs
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issue-55846.rs
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issue-59324.rs
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Point out if a local trait has no implementations
2023-09-10 21:20:36 +00:00
issue-62200.rs
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issue-62200.stderr
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2023-11-24 19:15:52 +01:00
issue-63591.rs
Split out a separate feature gate for impl trait in associated types
2023-04-12 16:17:31 +00:00
issue-63593.rs
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issue-63593.stderr
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2023-11-24 19:15:52 +01:00
issue-64848.rs
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issue-64855-2.rs
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issue-64855.stderr
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2023-11-24 19:15:52 +01:00
issue-65774-1.rs
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issue-65774-1.stderr
Note base types of coercion
2023-05-12 00:10:52 +00:00
issue-65774-2.rs
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issue-65774-2.stderr
Note base types of coercion
2023-05-12 00:10:52 +00:00
issue-65934.rs
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issue-67684.rs
Do not ICE when failing to normalize in ConstProp.
2023-03-06 09:28:49 +00:00
issue-69398.rs
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issue-71113.rs
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issue-72806.rs
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issue-72806.stderr
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2023-11-24 19:15:52 +01:00
issue-76179.rs
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issue-82079.rs
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issue-85103-layout-debug.rs
better spans for WF errors
2023-09-09 18:00:13 +02:00
issue-85103-layout-debug.stderr
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2023-11-24 19:15:52 +01:00
issue-87261.rs
Mention fn coercion rules (needs to be expanded)
2023-01-30 21:51:33 +00:00
issue-87261.stderr
Mention fn coercion rules (needs to be expanded)
2023-01-30 21:51:33 +00:00
issue-88856.rs
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issue-91069.rs
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issue-91231.rs
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issue-91234.rs
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missing-associated-types.rs
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missing-associated-types.stderr
Avoid iterating over hashmaps in astconv
2023-11-19 17:45:02 +01:00
normalization-debruijn-1.rs
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normalization-debruijn-2.rs
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normalization-debruijn-3.rs
Adjust UI tests for unit_bindings
2023-06-12 20:24:48 +08:00
normalization-generality-2.rs
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normalization-generality.rs
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normalization-probe-cycle.rs
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normalize-cycle-in-eval-no-region.rs
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normalize-cycle-in-eval.rs
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object-method-numbering.rs
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object-normalization.rs
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param-env-normalize-cycle.rs
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point-at-type-on-obligation-failure-2.rs
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point-at-type-on-obligation-failure-2.stderr
Point out if a local trait has no implementations
2023-09-10 21:20:36 +00:00
point-at-type-on-obligation-failure.rs
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point-at-type-on-obligation-failure.stderr
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2023-11-24 19:15:52 +01:00
project-defer-unification.rs
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project-recursion-limit-non-fatal.rs
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substs-ppaux.normal.stderr
Handle Self in paths too
2023-08-25 19:05:38 +00:00
substs-ppaux.rs
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substs-ppaux.verbose.stderr
Handle Self in paths too
2023-08-25 19:05:38 +00:00
trait-with-supertraits-needing-sized-self.rs
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trait-with-supertraits-needing-sized-self.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
wf-cycle-2.rs
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wf-cycle.rs
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