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bors 47dd709bed Auto merge of #121123 - compiler-errors:item-assumptions, r=oli-obk 
Split an item bounds and an item's super predicates

This is the moral equivalent of #107614, but instead for predicates this applies to **item bounds**. This PR splits out the item bounds (i.e. *all* predicates that are assumed to hold for the alias) from the item *super predicates*, which are the subset of item bounds which share the same self type as the alias.

## Why?

Much like #107614, there are places in the compiler where we *only* care about super-predicates, and considering predicates that possibly don't have anything to do with the alias is problematic. This includes things like closure signature inference (which is at its core searching for `Self: Fn(..)` style bounds), but also lints like `#[must_use]`, error reporting for aliases, computing type outlives predicates.

Even in cases where considering all of the `item_bounds` doesn't lead to bugs, unnecessarily considering irrelevant bounds does lead to a regression (#121121) due to doing extra work in the solver.

## Example 1 - Trait Aliases

This is best explored via an example:

```
type TAIT<T> = impl TraitAlias<T>;

trait TraitAlias<T> = A + B where T: C;
```

The item bounds list for `Tait<T>` will include:
* `Tait<T>: A`
* `Tait<T>: B`
* `T: C`

While `item_super_predicates` query will include just the first two predicates.

Side-note: You may wonder why `T: C` is included in the item bounds for `TAIT`? This is because when we elaborate `TraitAlias<T>`, we will also elaborate all the predicates on the trait.

## Example 2 - Associated Type Bounds

```
type TAIT<T> = impl Iterator<Item: A>;
```

The `item_bounds` list for `TAIT<T>` will include:
* `Tait<T>: Iterator`
* `<Tait<T> as Iterator>::Item: A`

But the `item_super_predicates` will just include the first bound, since that's the only bound that is relevant to the *alias* itself.

## So what

This leads to some diagnostics duplication just like #107614, but none of it will be user-facing. We only see it in the UI test suite because we explicitly disable diagnostic deduplication.

Regarding naming, I went with `super_predicates` kind of arbitrarily; this can easily be changed, but I'd consider better names as long as we don't block this PR in perpetuity.
2024-03-21 06:12:24 +00:00
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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
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in-ctfe
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in-trait
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issues
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multiple-lifetimes
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rpit
Auto merge of #121211 - lcnr:nll-relate-handle-infer, r=BoxyUwU
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transmute
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arg-position-impl-trait-too-long.rs
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arg-position-impl-trait-too-long.stderr
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associated-impl-trait-type-generic-trait.rs
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associated-impl-trait-type-issue-114325.rs
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associated-impl-trait-type-trivial.rs
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associated-impl-trait-type.rs
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associated-type-cycle.rs
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associated-type-cycle.stderr
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async_scope_creep.rs
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auto-trait-coherence.next.stderr
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auto-trait-coherence.rs
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auto-trait-leak2.rs
Revert "Suggest using Arc on !Send/!Sync types"
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auto-trait-leak2.stderr
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auto-trait-leak-rpass.rs
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auto-trait-leak.rs
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auto-trait-leak.stderr
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autoderef.rs
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bivariant-lifetime-liveness.rs
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bound-normalization-fail.rs
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bound-normalization-fail.stderr
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capture-lifetime-not-in-hir.rs
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dyn-impl-type-mismatch.rs
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dyn-trait-return-should-be-impl-trait.rs
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example-calendar.rs
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feature-self-return-type.rs
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fresh-lifetime-from-bare-trait-obj-114664.rs
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in-assoc-type-unconstrained.rs
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multiple-defining-usages-in-body.rs
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nested_impl_trait.rs
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2024-01-30 21:28:18 +00:00
nested-return-type2-tait2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +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
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +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
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type2-tait.stderr
Add AliasKind::Weak for type aliases.
2023-06-16 19:39:48 +00:00
nested-return-type2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type3-tait2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type3-tait2.stderr
Add AliasKind::Weak for type aliases.
2023-06-16 19:39:48 +00:00
nested-return-type3-tait3.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type3-tait3.stderr
…
nested-return-type3-tait.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type3-tait.stderr
Add AliasKind::Weak for type aliases.
2023-06-16 19:39:48 +00:00
nested-return-type3.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type4.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nested-return-type4.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
nested-return-type.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
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
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
nested-rpit-hrtb.rs
register opaques that reference errors
2024-03-20 17:30:19 +00:00
nested-rpit-hrtb.stderr
register opaques that reference errors
2024-03-20 17:30:19 +00:00
nested-rpit-with-anonymous-lifetimes.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
nesting.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
no-method-suggested-traits.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
no-method-suggested-traits.stderr
Deduplicate some logic and reword output
2024-02-22 18:05:28 +00:00
no-trait.rs
…
no-trait.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
normalize-opaque-with-bound-vars.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
normalize-tait-in-const.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
normalize-tait-in-const.stderr
Provide structured suggestion for #![feature(foo)]
2024-03-18 16:08:58 +00:00
not_general_enough_regression_106630.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
object-unsafe-trait-in-return-position-dyn-trait.rs
Continue compilation after check_mod_type_wf errors
2024-02-14 11:00:30 +00:00
object-unsafe-trait-in-return-position-dyn-trait.stderr
Continue compilation after check_mod_type_wf errors
2024-02-14 11:00:30 +00:00
object-unsafe-trait-in-return-position-impl-trait.rs
…
object-unsafe-trait-in-return-position-impl-trait.stderr
…
opaque-cast-field-access-in-future.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
opaque-cast-field-access-in-future.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
opaque-used-in-extraneous-argument.rs
Bless test fallout (duplicate diagnostics)
2024-03-20 13:00:34 -04:00
opaque-used-in-extraneous-argument.stderr
Bless test fallout (duplicate diagnostics)
2024-03-20 13:00:34 -04:00
point-to-type-err-cause-on-impl-trait-return.rs
Remove return type sized check hack from hir typeck
2023-05-18 01:53:01 +00:00
point-to-type-err-cause-on-impl-trait-return.stderr
Remove return type sized check hack from hir typeck
2023-05-18 01:53:01 +00:00
printing-binder.rs
…
printing-binder.stderr
…
private_unused.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
projection-mismatch-in-impl-where-clause.rs
…
projection-mismatch-in-impl-where-clause.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
projection.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
question_mark.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
recursive-auto-trait.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
recursive-coroutine-boxed.next.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
recursive-coroutine-boxed.rs
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
recursive-coroutine-indirect.current.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
recursive-coroutine-indirect.next.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
recursive-coroutine-indirect.rs
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
recursive-impl-trait-type-direct.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
recursive-impl-trait-type-indirect.rs
Make cycle error more resilient to where it starts
2024-01-08 20:30:24 +00:00
recursive-impl-trait-type-indirect.stderr
Make cycle error more resilient to where it starts
2024-01-08 20:30:24 +00:00
recursive-impl-trait-type-through-non-recursive.rs
…
recursive-impl-trait-type-through-non-recursive.stderr
…
recursive-type-alias-impl-trait-declaration-too-subtle-2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
recursive-type-alias-impl-trait-declaration-too-subtle.rs
…
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
Add AliasKind::Weak for type aliases.
2023-06-16 19:39:48 +00:00
recursive-type-alias-impl-trait-declaration.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
region-escape-via-bound-contravariant-closure.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
region-escape-via-bound-contravariant.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
region-escape-via-bound.rs
…
region-escape-via-bound.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
return-position-impl-trait-minimal.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
reveal-during-codegen.rs
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
rpit-assoc-pair-with-lifetime.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
rpit-not-sized.rs
…
rpit-not-sized.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
stashed-diag-issue-121504.rs
Overhaul how stashed diagnostics work, again.
2024-02-29 11:08:27 +11:00
stashed-diag-issue-121504.stderr
Overhaul how stashed diagnostics work, again.
2024-02-29 11:08:27 +11:00
static-lifetime-return-position-impl-trait.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
static-return-lifetime-infered.rs
…
static-return-lifetime-infered.stderr
adjust how closure/generator types and rvalues are printed
2023-09-21 22:20:58 +02:00
stranded-opaque.rs
Bless test fallout (duplicate diagnostics)
2024-03-20 13:00:34 -04:00
stranded-opaque.stderr
Bless test fallout (duplicate diagnostics)
2024-03-20 13:00:34 -04:00
suggest-calling-rpit-closure.rs
…
suggest-calling-rpit-closure.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
trait_resolution.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
trait_type.rs
…
trait_type.stderr
…
two_tait_defining_each_other2.current.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
two_tait_defining_each_other2.next.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
two_tait_defining_each_other2.rs
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
two_tait_defining_each_other3.current.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
two_tait_defining_each_other3.rs
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
two_tait_defining_each_other.current.stderr
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
two_tait_defining_each_other.rs
Ignore tests w/ current/next revisions from compare-mode=next-solver
2024-03-10 21:18:41 -04:00
type_parameters_captured.rs
…
type_parameters_captured.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
type-alias-generic-param.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
type-alias-generic-param.stderr
Update tests
2024-02-07 10:42:01 +08:00
type-alias-impl-trait-in-fn-body.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
type-arg-mismatch-due-to-impl-trait.rs
…
type-arg-mismatch-due-to-impl-trait.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
unactionable_diagnostic.fixed
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
unactionable_diagnostic.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
unactionable_diagnostic.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
universal_hrtb_anon.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
universal_hrtb_named.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
universal_in_adt_in_parameters.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
universal_in_impl_trait_in_parameters.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
universal_in_trait_defn_parameters.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
universal_multiple_bounds.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
universal_wrong_bounds.rs
…
universal_wrong_bounds.stderr
Special-case item attributes in the suggestion output
2023-04-12 22:50:10 +00:00
universal_wrong_hrtb.rs
migrate lifetime too
2023-06-26 19:14:49 +00:00
universal_wrong_hrtb.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
universal-mismatched-type.rs
…
universal-mismatched-type.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
universal-two-impl-traits.rs
…
universal-two-impl-traits.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
unsafety-checking-cycle.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
variance.e2024.stderr
Enable new capture rules by default on edition 2024
2023-12-05 19:53:59 +00:00
variance.new.stderr
Enable new capture rules by default on edition 2024
2023-12-05 19:53:59 +00:00
variance.old.stderr
Enable new capture rules by default on edition 2024
2023-12-05 19:53:59 +00:00
variance.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
wf-check-hidden-type.rs
when defining opaques, require the hidden type to be well-formed
2024-02-27 15:57:49 +01:00
wf-check-hidden-type.stderr
when defining opaques, require the hidden type to be well-formed
2024-02-27 15:57:49 +01:00
wf-eval-order.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
where-allowed-2.rs
…
where-allowed-2.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
where-allowed.rs
return ty::Error when equating ty::Error
2024-02-19 23:54:49 +00:00
where-allowed.stderr
Merge collect_mod_item_types query into check_well_formed
2024-03-07 14:26:31 +00:00
xcrate_simple.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
xcrate.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00