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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
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alias-liveness
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auxiliary
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diagnostics
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explicit-generic-args-with-impl-trait
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
in-trait
recurse into refs when comparing tys for diagnostics
2023-12-07 23:00:46 -05:00
issues
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
multiple-lifetimes
Manual find replace updates
2023-11-24 21:04:51 +01:00
rpit
check for non-defining uses of RPIT
2023-08-14 15:25:20 +02:00
arg-position-impl-trait-too-long.rs
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arg-position-impl-trait-too-long.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
associated-impl-trait-type-generic-trait.rs
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associated-impl-trait-type-trivial.rs
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associated-impl-trait-type.rs
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async_scope_creep.rs
Remove DefiningAnchor::Bubble from opaque wf check
2023-10-16 15:50:31 +00:00
auto-trait-coherence.next.stderr
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2023-11-24 19:15:52 +01:00
auto-trait-coherence.old.stderr
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2023-11-24 19:15:52 +01:00
auto-trait-coherence.rs
explicitly handle auto trait leakage in coherence
2023-10-13 09:42:51 +00:00
auto-trait-leak2.rs
Revert "Suggest using Arc on !Send/!Sync types"
2023-08-28 03:16:48 -07:00
auto-trait-leak2.stderr
Revert "Suggest using Arc on !Send/!Sync types"
2023-08-28 03:16:48 -07:00
auto-trait-leak-rpass.rs
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auto-trait-leak.rs
Stash and cancel cycle errors for auto trait leakage in opaques
2023-10-26 17:58:02 +00:00
auto-trait-leak.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
autoderef.rs
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bivariant-lifetime-liveness.rs
Flesh out tests more
2023-10-17 01:26:46 +00:00
bound-normalization-fail.rs
Stabilize impl_trait_projections
2023-09-08 03:45:36 +00:00
bound-normalization-fail.stderr
Stabilize impl_trait_projections
2023-09-08 03:45:36 +00:00
bound-normalization-pass.rs
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bounds_regression.rs
s/generator/coroutine/
2023-10-20 21:14:01 +00:00
can-return-unconstrained-closure.rs
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capture-lifetime-not-in-hir.rs
Stabilize impl_trait_projections
2023-09-08 03:45:36 +00:00
capture-lifetime-not-in-hir.stderr
Stabilize impl_trait_projections
2023-09-08 03:45:36 +00:00
closure-calling-parent-fn.rs
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closure-in-impl-trait-arg.rs
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closure-in-impl-trait.rs
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coherence-treats-tait-ambig.current.stderr
Manual find replace updates
2023-11-24 21:04:51 +01:00
coherence-treats-tait-ambig.rs
update tests
2023-09-21 08:17:58 +02:00
coherence-treats-tait-ambig.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
cross-return-site-inference.rs
Reorder fullfillment errors to keep more interesting ones first
2023-10-04 02:04:14 +00:00
cross-return-site-inference.stderr
Show suggestion for <SelfTy as Trait>::assoc_fn in more cases and fmt code
2023-10-04 02:04:14 +00:00
deduce-signature-from-supertrait.rs
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defined-by-trait-resolution.rs
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deprecated_annotation.rs
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divergence.rs
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does-not-live-long-enough.rs
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does-not-live-long-enough.stderr
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2023-11-24 19:15:52 +01:00
dont-suggest-box-on-empty-else-arm.rs
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dont-suggest-box-on-empty-else-arm.stderr
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2023-11-24 19:15:52 +01:00
dyn-trait-elided-two-inputs-assoc.rs
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dyn-trait-elided-two-inputs-param.rs
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dyn-trait-elided-two-inputs-ref-assoc.rs
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dyn-trait-elided-two-inputs-ref-param.rs
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dyn-trait-return-should-be-impl-trait.rs
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dyn-trait-return-should-be-impl-trait.stderr
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equal-hidden-lifetimes.rs
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equality2.rs
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equality2.stderr
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equality-in-canonical-query.clone.stderr
Rename HandlerInner::delay_span_bug as HandlerInner::span_delayed_bug.
2023-12-02 09:01:19 +11:00
equality-in-canonical-query.rs
revert rust-lang/rust#114586
2023-10-18 06:19:04 +00:00
equality-rpass.rs
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equality-rpass.stderr
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equality.rs
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equality.stderr
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erased-regions-in-hidden-ty.current.stderr
finish RegionKind rename
2023-11-14 13:13:27 +00:00
erased-regions-in-hidden-ty.next.stderr
finish RegionKind rename
2023-11-14 13:13:27 +00:00
erased-regions-in-hidden-ty.rs
Let's see what those opaque types actually are
2023-10-23 16:18:35 -04:00
example-calendar.rs
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example-st.rs
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extra-impl-in-trait-impl.fixed
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extra-impl-in-trait-impl.rs
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extra-impl-in-trait-impl.stderr
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extra-item.rs
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extra-item.stderr
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fallback_inference.rs
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fallback_inference.stderr
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fallback.rs
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feature-self-return-type.rs
Stabilize impl_trait_projections
2023-09-08 03:45:36 +00:00
feature-self-return-type.stderr
Stabilize impl_trait_projections
2023-09-08 03:45:36 +00:00
fresh-lifetime-from-bare-trait-obj-114664.rs
Record binder for bare trait object in LifetimeCollectVisitor
2023-08-11 03:15:41 +00:00
fresh-lifetime-from-bare-trait-obj-114664.stderr
Add a note to duplicate diagnostics
2023-10-05 01:04:41 +00:00
generic-with-implicit-hrtb-without-dyn.edition2015.stderr
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generic-with-implicit-hrtb-without-dyn.edition2021.stderr
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generic-with-implicit-hrtb-without-dyn.rs
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hidden-lifetimes.rs
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hidden-lifetimes.stderr
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hidden-type-is-opaque-2.rs
Fix invalid suggestion for mismatched types in closure arguments
2023-07-30 17:15:55 +02:00
hidden-type-is-opaque-2.stderr
Fix invalid suggestion for mismatched types in closure arguments
2023-07-30 17:15:55 +02:00
hidden-type-is-opaque.rs
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impl_fn_associativity.rs
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impl_trait_projections.rs
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impl_trait_projections.stderr
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impl-fn-hrtb-bounds-2.rs
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impl-fn-hrtb-bounds-2.stderr
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2023-11-24 19:15:52 +01:00
impl-fn-hrtb-bounds.rs
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impl-fn-hrtb-bounds.stderr
On borrow return type, suggest borrowing from arg or owned return type
2023-11-20 23:44:36 +00:00
impl-fn-parsing-ambiguities.rs
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impl-fn-parsing-ambiguities.stderr
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impl-fn-predefined-lifetimes.rs
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impl-fn-predefined-lifetimes.stderr
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impl-generic-mismatch-ab.rs
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impl-generic-mismatch-ab.stderr
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impl-generic-mismatch.rs
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impl-generic-mismatch.stderr
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impl-subtyper2.rs
move subtyper change reveal_all
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impl-subtyper.rs
move subtyper change reveal_all
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impl-trait-in-macro.rs
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impl-trait-in-macro.stderr
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impl-trait-plus-priority.rs
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impl-trait-plus-priority.stderr
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implicit-capture-late.rs
Add test for implicitly capturing late-bound var with new capture rules
2023-12-05 19:53:59 +00:00
implicit-capture-late.stderr
Add test for implicitly capturing late-bound var with new capture rules
2023-12-05 19:53:59 +00:00
in-assoc-type-unconstrained.rs
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in-assoc-type-unconstrained.stderr
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in-assoc-type.rs
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in-assoc-type.stderr
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issue-35668.rs
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issue-36792.rs
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2023-11-24 19:15:52 +01:00
issue-55872-1.rs
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issue-55872-1.stderr
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issue-55872-2.rs
Bless tests.
2023-09-23 13:47:30 +00:00
issue-55872-2.stderr
Add a note to duplicate diagnostics
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issue-55872-3.rs
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issue-55872-3.stderr
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issue-55872.rs
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issue-55872.stderr
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issue-56445.rs
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issue-68532.rs
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issue-72911.rs
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issue-72911.stderr
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issue-86465.rs
Revert "Auto merge of #102417 - oli-obk:opaque_lifetimes2, r=jackh726"
2023-08-30 11:06:46 +00:00
issue-86465.stderr
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issue-87450.rs
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issue-87450.stderr
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2023-11-24 19:15:52 +01:00
issue-99073-2.rs
check for non-defining uses of RPIT
2023-08-14 15:25:20 +02:00
issue-99073-2.stderr
check for non-defining uses of RPIT
2023-08-14 15:25:20 +02:00
issue-99073.rs
check for non-defining uses of RPIT
2023-08-14 15:25:20 +02:00
issue-99073.stderr
adjust how closure/generator types and rvalues are printed
2023-09-21 22:20:58 +02:00
issue-99642-2.rs
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issue-99642.rs
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issue-99914.rs
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issue-99914.stderr
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issue-100075-2.rs
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issue-100075-2.stderr
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issue-100075.rs
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issue-100187.rs
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issue-102605.rs
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issue-103181-1.current.stderr
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issue-103181-1.next.stderr
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2023-11-24 19:15:52 +01:00
issue-103181-1.rs
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issue-103181-2.rs
More precisely detect cycle errors from type_of on opaque
2023-08-27 22:03:16 +00:00
issue-103181-2.stderr
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2023-11-24 19:15:52 +01:00
issue-103599.rs
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issue-103599.stderr
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issue-108591.rs
Revert "Auto merge of #102417 - oli-obk:opaque_lifetimes2, r=jackh726"
2023-08-30 11:06:46 +00:00
issue-108592.rs
Revert "Auto merge of #102417 - oli-obk:opaque_lifetimes2, r=jackh726"
2023-08-30 11:06:46 +00:00
lifetime-ambiguity-regression.rs
Paper over an accidental regression
2023-09-14 15:16:48 +00:00
lifetimes2.rs
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lifetimes.rs
s/generator/coroutine/
2023-10-20 21:14:01 +00:00
mapping-duplicated-lifetimes-issue-114597.rs
add'l test
2023-08-08 09:39:59 +00:00
method-suggestion-no-duplication.rs
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method-suggestion-no-duplication.stderr
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2023-11-24 19:15:52 +01:00
multiple-defining-usages-in-body.rs
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multiple-defining-usages-in-body.stderr
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2023-11-24 19:15:52 +01:00
must_outlive_least_region_or_bound.rs
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must_outlive_least_region_or_bound.stderr
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2023-10-08 10:06:17 +00:00
needs_least_region_or_bound.rs
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negative-reasoning.rs
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negative-reasoning.stderr
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2023-11-24 19:15:52 +01:00
nested_impl_trait.rs
Tweak wording of E0562
2023-10-04 19:51:43 +00:00
nested_impl_trait.stderr
Tweak wording of E0562
2023-10-04 19:51:43 +00:00
nested-return-type2-tait2.rs
Remove DefiningAnchor::Bubble from opaque wf check
2023-10-16 15:50:31 +00:00
nested-return-type2-tait2.stderr
Remove DefiningAnchor::Bubble from opaque wf check
2023-10-16 15:50:31 +00:00
nested-return-type2-tait3.rs
Remove DefiningAnchor::Bubble from opaque wf check
2023-10-16 15:50:31 +00:00
nested-return-type2-tait3.stderr
Remove DefiningAnchor::Bubble from opaque wf check
2023-10-16 15:50:31 +00:00
nested-return-type2-tait.rs
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nested-return-type2-tait.stderr
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nested-return-type2.rs
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nested-return-type3-tait2.rs
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nested-return-type3-tait2.stderr
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nested-return-type3-tait3.rs
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nested-return-type3-tait3.stderr
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nested-return-type3-tait.rs
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nested-return-type3-tait.stderr
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nested-return-type3.rs
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nested-return-type4.rs
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nested-return-type4.stderr
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2023-11-24 19:15:52 +01:00
nested-return-type.rs
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nested-rpit-hrtb-2.rs
don't ICE on higher ranked hidden types
2023-08-04 15:11:09 +00:00
nested-rpit-hrtb-2.stderr
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2023-11-24 19:15:52 +01:00
nested-rpit-hrtb.rs
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nested-rpit-hrtb.stderr
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nested-rpit-with-anonymous-lifetimes.rs
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nesting.rs
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no-method-suggested-traits.rs
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no-method-suggested-traits.stderr
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no-trait.rs
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no-trait.stderr
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2023-11-24 19:15:52 +01:00
normalize-opaque-with-bound-vars.rs
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normalize-tait-in-const.rs
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normalize-tait-in-const.stderr
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2023-11-24 19:15:52 +01:00
object-unsafe-trait-in-return-position-dyn-trait.rs
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object-unsafe-trait-in-return-position-dyn-trait.stderr
On object safety error, mention new enum as alternative
2023-10-29 23:55:46 +00:00
object-unsafe-trait-in-return-position-impl-trait.rs
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object-unsafe-trait-in-return-position-impl-trait.stderr
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opaque-cast-field-access-in-future.rs
Only prevent field projections into opaque types, not types containing opaque types
2023-09-25 17:41:08 +00:00
opaque-cast-field-access-in-future.stderr
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2023-11-24 19:15:52 +01:00
point-to-type-err-cause-on-impl-trait-return.rs
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point-to-type-err-cause-on-impl-trait-return.stderr
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printing-binder.rs
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printing-binder.stderr
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private_unused.rs
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projection-mismatch-in-impl-where-clause.rs
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projection-mismatch-in-impl-where-clause.stderr
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2023-11-24 19:15:52 +01:00
projection.rs
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question_mark.rs
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recursive-auto-trait.rs
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recursive-coroutine.current.stderr
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recursive-coroutine.next.stderr
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2023-11-24 19:15:52 +01:00
recursive-coroutine.rs
update tests
2023-11-09 11:32:51 +01:00
recursive-impl-trait-type-direct.rs
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recursive-impl-trait-type-indirect.rs
s/generator/coroutine/
2023-10-20 21:14:01 +00:00
recursive-impl-trait-type-indirect.stderr
s/generator/coroutine/
2023-10-20 21:14:01 +00:00
recursive-impl-trait-type-through-non-recursive.rs
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recursive-impl-trait-type-through-non-recursive.stderr
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recursive-type-alias-impl-trait-declaration-too-subtle-2.rs
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recursive-type-alias-impl-trait-declaration-too-subtle.rs
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recursive-type-alias-impl-trait-declaration-too-subtle.stderr
recurse into refs when comparing tys for diagnostics
2023-12-07 23:00:46 -05:00
recursive-type-alias-impl-trait-declaration.rs
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recursive-type-alias-impl-trait-declaration.stderr
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2023-11-24 19:15:52 +01:00
region-escape-via-bound-contravariant-closure.rs
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region-escape-via-bound-contravariant.rs
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region-escape-via-bound.rs
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region-escape-via-bound.stderr
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2023-11-24 19:15:52 +01:00
return-position-impl-trait-minimal.rs
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reveal-during-codegen.rs
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rpit-assoc-pair-with-lifetime.rs
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rpit-not-sized.rs
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rpit-not-sized.stderr
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2023-11-24 19:15:52 +01:00
static-lifetime-return-position-impl-trait.rs
Stabilize AFIT and RPITIT
2023-10-13 21:01:36 +00:00
static-return-lifetime-infered.rs
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static-return-lifetime-infered.stderr
adjust how closure/generator types and rvalues are printed
2023-09-21 22:20:58 +02:00
suggest-calling-rpit-closure.rs
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suggest-calling-rpit-closure.stderr
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2023-11-24 19:15:52 +01:00
trait_resolution.rs
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trait_type.rs
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trait_type.stderr
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two_tait_defining_each_other2.current.stderr
update tests
2023-11-09 11:32:51 +01:00
two_tait_defining_each_other2.next.stderr
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two_tait_defining_each_other2.rs
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two_tait_defining_each_other3.current.stderr
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two_tait_defining_each_other3.rs
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two_tait_defining_each_other.current.stderr
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two_tait_defining_each_other.rs
update tests
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type_parameters_captured.rs
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type_parameters_captured.stderr
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2023-11-24 19:15:52 +01:00
type-alias-generic-param.rs
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type-alias-impl-trait-in-fn-body.rs
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type-arg-mismatch-due-to-impl-trait.rs
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type-arg-mismatch-due-to-impl-trait.stderr
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2023-11-24 19:15:52 +01:00
unactionable_diagnostic.fixed
remove trailing dots
2023-10-08 10:06:17 +00:00
unactionable_diagnostic.rs
remove trailing dots
2023-10-08 10:06:17 +00:00
unactionable_diagnostic.stderr
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universal_hrtb_anon.rs
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universal_hrtb_named.rs
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universal_in_adt_in_parameters.rs
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universal_in_impl_trait_in_parameters.rs
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universal_in_trait_defn_parameters.rs
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universal_multiple_bounds.rs
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universal_wrong_bounds.rs
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universal_wrong_bounds.stderr
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universal_wrong_hrtb.rs
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universal_wrong_hrtb.stderr
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universal-mismatched-type.rs
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universal-mismatched-type.stderr
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universal-two-impl-traits.rs
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universal-two-impl-traits.stderr
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unsafety-checking-cycle.rs
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variance.e2024.stderr
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variance.new.stderr
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variance.old.stderr
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variance.rs
Enable new capture rules by default on edition 2024
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wf-eval-order.rs
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where-allowed-2.rs
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where-allowed-2.stderr
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where-allowed.rs
Stabilize AFIT and RPITIT
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where-allowed.stderr
Stabilize AFIT and RPITIT
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xcrate_simple.rs
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xcrate.rs
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