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bors a971212545 Auto merge of #127672 - compiler-errors:precise-capturing, r=spastorino 
Stabilize opaque type precise capturing (RFC 3617)

This PR partially stabilizes opaque type *precise capturing*, which was specified in [RFC 3617](https://github.com/rust-lang/rfcs/pull/3617), and whose syntax was amended by FCP in [#125836](https://github.com/rust-lang/rust/issues/125836).

This feature, as stabilized here, gives us a way to explicitly specify the generic lifetime parameters that an RPIT-like opaque type captures.  This solves the problem of overcapturing, for lifetime parameters in these opaque types, and will allow the Lifetime Capture Rules 2024 ([RFC 3498](https://github.com/rust-lang/rfcs/pull/3498)) to be fully stabilized for RPIT in Rust 2024.

### What are we stabilizing?

This PR stabilizes the use of a `use<'a, T>` bound in return-position impl Trait opaque types.  Such a bound fully specifies the set of generic parameters captured by the RPIT opaque type, entirely overriding the implicit default behavior.  E.g.:

```rust
fn does_not_capture<'a, 'b>() -> impl Sized + use<'a> {}
//                               ~~~~~~~~~~~~~~~~~~~~
//                This RPIT opaque type does not capture `'b`.
```

The way we would suggest thinking of `impl Trait` types *without* an explicit `use<..>` bound is that the `use<..>` bound has been *elided*, and that the bound is filled in automatically by the compiler according to the edition-specific capture rules.

All non-`'static` lifetime parameters, named (i.e. non-APIT) type parameters, and const parameters in scope are valid to name, including an elided lifetime if such a lifetime would also be valid in an outlives bound, e.g.:

```rust
fn elided(x: &u8) -> impl Sized + use<'_> { x }
```

Lifetimes must be listed before type and const parameters, but otherwise the ordering is not relevant to the `use<..>` bound.  Captured parameters may not be duplicated.  For now, only one `use<..>` bound may appear in a bounds list.  It may appear anywhere within the bounds list.

### How does this differ from the RFC?

This stabilization differs from the RFC in one respect: the RFC originally specified `use<'a, T>` as syntactically part of the RPIT type itself, e.g.:

```rust
fn capture<'a>() -> impl use<'a> Sized {}
```

However, settling on the final syntax was left as an open question.  T-lang later decided via FCP in [#125836](https://github.com/rust-lang/rust/issues/125836) to treat `use<..>` as a syntactic bound instead, e.g.:

```rust
fn capture<'a>() -> impl Sized + use<'a> {}
```

### What aren't we stabilizing?

The key goal of this PR is to stabilize the parts of *precise capturing* that are needed to enable the migration to Rust 2024.

There are some capabilities of *precise capturing* that the RFC specifies but that we're not stabilizing here, as these require further work on the type system.  We hope to lift these limitations later.

The limitations that are part of this PR were specified in the [RFC's stabilization strategy](https://rust-lang.github.io/rfcs/3617-precise-capturing.html#stabilization-strategy).

#### Not capturing type or const parameters

The RFC addresses the overcapturing of type and const parameters; that is, it allows for them to not be captured in opaque types.  We're not stabilizing that in this PR.  Since all in scope generic type and const parameters are implicitly captured in all editions, this is not needed for the migration to Rust 2024.

For now, when using `use<..>`, all in scope type and const parameters must be nameable (i.e., APIT cannot be used) and included as arguments.  For example, this is an error because `T` is in scope and not included as an argument:

```rust
fn test<T>() -> impl Sized + use<> {}
//~^ ERROR `impl Trait` must mention all type parameters in scope in `use<...>`
```

This is due to certain current limitations in the type system related to how generic parameters are represented as captured (i.e. bivariance) and how inference operates.

We hope to relax this in the future, and this stabilization is forward compatible with doing so.

#### Precise capturing for return-position impl Trait **in trait** (RPITIT)

The RFC specifies precise capturing for RPITIT.  We're not stabilizing that in this PR.  Since RPITIT already adheres to the Lifetime Capture Rules 2024, this isn't needed for the migration to Rust 2024.

The effect of this is that the anonymous associated types created by RPITITs must continue to capture all of the lifetime parameters in scope, e.g.:

```rust
trait Foo<'a> {
    fn test() -> impl Sized + use<Self>;
    //~^ ERROR `use<...>` precise capturing syntax is currently not allowed in return-position `impl Trait` in traits
}
```

To allow this involves a meaningful amount of type system work related to adding variance to GATs or reworking how generics are represented in RPITITs.  We plan to do this work separately from the stabilization.  See:

- https://github.com/rust-lang/rust/pull/124029

Supporting precise capturing for RPITIT will also require us to implement a new algorithm for detecting refining capture behavior.  This may involve looking through type parameters to detect cases where the impl Trait type in an implementation captures fewer lifetimes than the corresponding RPITIT in the trait definition, e.g.:

```rust
trait Foo {
    fn rpit() -> impl Sized + use<Self>;
}

impl<'a> Foo for &'a () {
    // This is "refining" due to not capturing `'a` which
    // is implied by the trait's `use<Self>`.
    fn rpit() -> impl Sized + use<>;

    // This is not "refining".
    fn rpit() -> impl Sized + use<'a>;
}
```

This stabilization is forward compatible with adding support for this later.

### The technical details

This bound is purely syntactical and does not lower to a [`Clause`](https://doc.rust-lang.org/1.79.0/nightly-rustc/rustc_middle/ty/type.ClauseKind.html) in the type system.  For the purposes of the type system (and for the types team's curiosity regarding this stabilization), we have no current need to represent this as a `ClauseKind`.

Since opaques already capture a variable set of lifetimes depending on edition and their syntactical position (e.g. RPIT vs RPITIT), a `use<..>` bound is just a way to explicitly rather than implicitly specify that set of lifetimes, and this only affects opaque type lowering from AST to HIR.

### FCP plan

While there's much discussion of the type system here, the feature in this PR is implemented internally as a transformation that happens before lowering to the type system layer.  We already support impl Trait types partially capturing the in scope lifetimes; we just currently only expose that implicitly.

So, in my (errs's) view as a types team member, there's nothing for types to weigh in on here with respect to the implementation being stabilized, and I'd suggest a lang-only proposed FCP (though we'll of course CC the team below).

### Authorship and acknowledgments

This stabilization report was coauthored by compiler-errors and TC.

TC would like to acknowledge the outstanding and speedy work that compiler-errors has done to make this feature happen.

compiler-errors thanks TC for authoring the RFC, for all of his involvement in this feature's development, and pushing the Rust 2024 edition forward.

### Open items

We're doing some things in parallel here.  In signaling the intention to stabilize, we want to uncover any latent issues so we can be sure they get addressed.  We want to give the maximum time for discussion here to happen by starting it while other remaining miscellaneous work proceeds.  That work includes:

- [x] Look into `syn` support.
  - https://github.com/dtolnay/syn/issues/1677
  - https://github.com/dtolnay/syn/pull/1707
- [x] Look into `rustfmt` support.
  - https://github.com/rust-lang/rust/pull/126754
- [x] Look into `rust-analyzer` support.
  - https://github.com/rust-lang/rust-analyzer/issues/17598
  - https://github.com/rust-lang/rust-analyzer/pull/17676
- [x] Look into `rustdoc` support.
  - https://github.com/rust-lang/rust/issues/127228
  - https://github.com/rust-lang/rust/pull/127632
  - https://github.com/rust-lang/rust/pull/127658
- [x] Suggest this feature to RfL (a known nightly user).
- [x] Add a chapter to the edition guide.
  - https://github.com/rust-lang/edition-guide/pull/316
- [x] Update the Reference.
  - https://github.com/rust-lang/reference/pull/1577

### (Selected) implementation history

* https://github.com/rust-lang/rfcs/pull/3498
* https://github.com/rust-lang/rfcs/pull/3617
* https://github.com/rust-lang/rust/pull/123468
* https://github.com/rust-lang/rust/issues/125836
* https://github.com/rust-lang/rust/pull/126049
* https://github.com/rust-lang/rust/pull/126753

Closes #123432.

cc `@rust-lang/lang` `@rust-lang/types`

`@rustbot` labels +T-lang +I-lang-nominated +A-impl-trait +F-precise_capturing

Tracking:

- https://github.com/rust-lang/rust/issues/123432

----

For the compiler reviewer, I'll leave some inline comments about diagnostics fallout :^)

r? compiler
2024-08-20 10:42:55 +00:00
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auxiliary tidy check to find misc files in ui tests, and clean up the results 2023-05-09 20:35:39 -04:00
allow-features-empty.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
allow-features-empty.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
allow-features.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
allow-features.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
bench.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
bench.stderr make soft_unstable show up in future breakage reports 2023-09-29 21:56:57 +02:00
doc-rust-logo.rs rustdoc: remove rust logo from non-Rust crates 2023-10-08 20:17:53 -07:00
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duplicate-features.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
duplicate-features.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
env-flag.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
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feature-gate-abi.rs Don't even parse an intrinsic unless the feature gate is enabled 2024-04-07 13:30:12 -04:00
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feature-gate-adt_const_params.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-arbitrary-self-types.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-arbitrary_self_types-raw-pointer.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-asm_goto.rs Add tests for asm goto 2024-02-24 19:49:16 +00:00
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feature-gate-assoc-type-defaults.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-box_patterns.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-builtin_syntax.rs Add feature gate 2023-05-05 21:44:48 +02:00
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feature-gate-c_variadic.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-cfg-relocation-model.rs Add the relocation_model to the cfg 2023-08-18 19:57:28 +02:00
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feature-gate-cfg-sanitizer_cfi.rs Add missing CFI sanitizer cfgs feature gate 2023-12-23 00:52:42 +01:00
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feature-gate-cfg-target-compact.rs tests/ui: prepare some tests for --check-cfg by default 2024-05-04 11:30:38 +02:00
feature-gate-cfg-target-compact.stderr tests/ui: prepare some tests for --check-cfg by default 2024-05-04 11:30:38 +02:00
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feature-gate-cfg-target-thread-local.stderr Continue to borrowck even if there were previous errors 2024-02-08 08:10:43 +00:00
feature-gate-cfg-version.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-cfg_overflow_checks.rs Add support for cfg(overflow_checks) 2023-05-11 18:06:31 +04:00
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feature-gate-cfg_ub_checks.rs Put checks that detect UB under their own flag below debug_assertions 2024-04-06 11:21:47 -04:00
feature-gate-cfg_ub_checks.stderr Put checks that detect UB under their own flag below debug_assertions 2024-04-06 11:21:47 -04:00
feature-gate-cfi_encoding.rs Add cross-language LLVM CFI support to the Rust compiler 2023-05-03 22:41:29 +00:00
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feature-gate-closure_lifetime_binder.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-closure_track_caller.rs Error on using yield without also using #[coroutine] on the closure 2024-04-24 08:05:29 +00:00
feature-gate-closure_track_caller.stderr Error on using yield without also using #[coroutine] on the closure 2024-04-24 08:05:29 +00:00
feature-gate-compiler-builtins.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-concat_bytes.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-const-indexing.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-const-refs-to-static.rs check_consts: fix some duplicate errors by not calling check_static unnecessarily 2024-02-11 15:12:10 +01:00
feature-gate-const-refs-to-static.stderr check_consts: fix some duplicate errors by not calling check_static unnecessarily 2024-02-11 15:12:10 +01:00
feature-gate-const_refs_to_cell.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-coroutines.e2024.stderr Error on using yield without also using #[coroutine] on the closure 2024-04-24 08:05:29 +00:00
feature-gate-coroutines.none.stderr rustc_ast_lowering: make "yield syntax is experimental" translatable 2024-08-10 14:32:55 +03:00
feature-gate-coroutines.rs Error on using yield without also using #[coroutine] on the closure 2024-04-24 08:05:29 +00:00
feature-gate-coverage-attribute.rs Rename the feature, but not the attribute, to coverage_attribute 2023-09-08 12:46:09 +01:00
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feature-gate-custom_attribute.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-custom_attribute.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-custom_attribute2.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-custom_attribute2.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-custom_mir.rs Continue to borrowck even if there were previous errors 2024-02-08 08:10:43 +00:00
feature-gate-custom_mir.stderr Continue to borrowck even if there were previous errors 2024-02-08 08:10:43 +00:00
feature-gate-custom_test_frameworks.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-decl_macro.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-deprecated_safe.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-deref_patterns.rs Add barest-bones deref patterns 2024-03-20 22:30:27 +01:00
feature-gate-deref_patterns.stderr Add barest-bones deref patterns 2024-03-20 22:30:27 +01:00
feature-gate-derive-smart-pointer.rs derive(SmartPointer): register helper attributes 2024-08-13 04:26:48 +08:00
feature-gate-derive-smart-pointer.stderr derive(SmartPointer): register helper attributes 2024-08-13 04:26:48 +08:00
feature-gate-dispatch-from-dyn-cell.rs Replace item names containing an error code with something more meaningful 2024-04-30 22:27:19 +02:00
feature-gate-dispatch-from-dyn-cell.stderr Replace item names containing an error code with something more meaningful 2024-04-30 22:27:19 +02:00
feature-gate-dispatch-from-dyn-missing-impl.rs add feature gate tests for DispatchFromDyn 2023-01-24 14:21:57 +01:00
feature-gate-dispatch-from-dyn-missing-impl.stderr On object safety error, mention new enum as alternative 2023-10-29 23:55:46 +00:00
feature-gate-doc_cfg.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-doc_masked.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-doc_notable_trait.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-exhaustive-patterns.rs Update tests 2024-08-10 12:07:17 +02:00
feature-gate-exhaustive-patterns.stderr Update tests 2024-08-10 12:07:17 +02:00
feature-gate-explicit_tail_calls.rs Syntatically accept become expressions 2023-06-19 12:54:34 +00:00
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feature-gate-extern_absolute_paths.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-extern_absolute_paths.stderr Do not use question as label 2024-07-24 21:03:27 +00:00
feature-gate-extern_types.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-f16.e2015.stderr Fix f16 and f128 feature gates in editions other than 2015 2024-04-03 16:03:22 -04:00
feature-gate-f16.e2018.stderr Fix f16 and f128 feature gates in editions other than 2015 2024-04-03 16:03:22 -04:00
feature-gate-f16.rs Update f16 and f128 tests to run on both 2015 and 2018 editions 2024-04-03 16:03:22 -04:00
feature-gate-f128.e2015.stderr Fix f16 and f128 feature gates in editions other than 2015 2024-04-03 16:03:22 -04:00
feature-gate-f128.e2018.stderr Fix f16 and f128 feature gates in editions other than 2015 2024-04-03 16:03:22 -04:00
feature-gate-f128.rs Update f16 and f128 tests to run on both 2015 and 2018 editions 2024-04-03 16:03:22 -04:00
feature-gate-feature-gate.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-feature-gate.stderr Undeprecate and use lint unstable_features 2023-12-20 18:16:28 +01:00
feature-gate-ffi_const.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-ffi_pure.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
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feature-gate-fn_align.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-fn_align.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-fn_delegation.rs Delegation implementation: step 1 2024-01-12 14:11:16 +03:00
feature-gate-fn_delegation.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-format_args_nl.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-format_args_nl.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-freeze-impls.rs Forbid implementing Freeze even if the trait is stabilized 2024-02-29 14:10:29 +00:00
feature-gate-freeze-impls.stderr Forbid implementing Freeze even if the trait is stabilized 2024-02-29 14:10:29 +00:00
feature-gate-fundamental.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-fundamental.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-gen_blocks.e2024.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-gen_blocks.none.stderr Actually parse async gen blocks correctly 2023-12-12 20:13:37 +00:00
feature-gate-gen_blocks.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-generic_arg_infer.normal.stderr Provide structured suggestion for #![feature(foo)] 2024-03-18 16:08:58 +00:00
feature-gate-generic_arg_infer.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-generic_associated_types_extended.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-generic_associated_types_extended.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-global-registration.rs add todo test for feature gate 2024-05-20 09:18:49 +02:00
feature-gate-global-registration.stderr add todo test for feature gate 2024-05-20 09:18:49 +02:00
feature-gate-impl_trait_in_assoc_type.rs Avoid silencing relevant follow-up errors 2024-01-09 21:08:16 +00:00
feature-gate-impl_trait_in_assoc_type.stderr Merge collect_mod_item_types query into check_well_formed 2024-03-07 14:26:31 +00:00
feature-gate-impl_trait_in_fn_trait_return.rs Split note, fix const/static impl trait error 2024-01-07 18:00:03 +00:00
feature-gate-impl_trait_in_fn_trait_return.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-inherent_associated_types.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-inherent_associated_types.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-inline_const_pat.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-inline_const_pat.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-intrinsics.rs Don't even parse an intrinsic unless the feature gate is enabled 2024-04-07 13:30:12 -04:00
feature-gate-intrinsics.stderr Don't even parse an intrinsic unless the feature gate is enabled 2024-04-07 13:30:12 -04:00
feature-gate-lang-items.rs consistency rename: language item -> lang item 2024-04-17 13:00:43 +02:00
feature-gate-lang-items.stderr consistency rename: language item -> lang item 2024-04-17 13:00:43 +02:00
feature-gate-large-assignments.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-large-assignments.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-lifetime-capture-rules-2024.rs Add lifetime_capture_rules_2024 2023-12-05 19:53:59 +00:00
feature-gate-lifetime-capture-rules-2024.stderr Bless test fallout 2024-08-17 12:43:25 -04:00
feature-gate-link-arg-attribute.rs Enable link-arg link kind inside of #[link] attribute 2023-11-30 08:26:13 -08:00
feature-gate-link-arg-attribute.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-link_cfg.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-link_cfg.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-link_llvm_intrinsics.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-link_llvm_intrinsics.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-linkage.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-linkage.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-log_syntax.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-log_syntax.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-log_syntax.stdout Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-log_syntax2.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-log_syntax2.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-log_syntax2.stdout Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-macro-metavar-expr-concat.rs Add a new concat metavar expr 2024-06-13 22:12:26 -03:00
feature-gate-macro-metavar-expr-concat.stderr Add a new concat metavar expr 2024-06-13 22:12:26 -03:00
feature-gate-marker_trait_attr.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-marker_trait_attr.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-may-dangle.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-may-dangle.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-min_const_fn.rs E0379: Make diagnostic more precise 2024-01-02 13:49:47 +01:00
feature-gate-min_const_fn.stderr E0379: Provide suggestions 2024-01-02 13:49:48 +01:00
feature-gate-more-maybe-bounds.rs Forbid ?Trait bounds repetitions 2024-07-26 16:35:05 +03:00
feature-gate-more-maybe-bounds.stderr Forbid ?Trait bounds repetitions 2024-07-26 16:35:05 +03:00
feature-gate-more-qualified-paths.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-more-qualified-paths.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-multiple_supertrait_upcastable.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-multiple_supertrait_upcastable.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-mut-ref.rs Feature gate 2024-03-27 11:20:28 -04:00
feature-gate-mut-ref.stderr Feature gate 2024-03-27 11:20:28 -04:00
feature-gate-naked_functions.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-naked_functions.stderr Continue to borrowck even if there were previous errors 2024-02-08 08:10:43 +00:00
feature-gate-native_link_modifiers_as_needed.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-native_link_modifiers_as_needed.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-needs-allocator.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-needs-allocator.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-negate-unsigned.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-negate-unsigned.stderr Tweak -1 as usize suggestion 2024-07-05 00:52:01 +00:00
feature-gate-negative_bounds.rs Implement negative bounds 2023-05-02 22:36:24 +00:00
feature-gate-negative_bounds.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
feature-gate-never_patterns.rs Check bindings around never patterns 2024-01-09 17:00:24 +01:00
feature-gate-never_patterns.stderr Auto merge of #119610 - Nadrieril:never_pattern_bindings, r=compiler-errors 2024-01-15 21:24:13 +00:00
feature-gate-never_type.rs Update never_type feature gate ui test 2024-02-01 20:01:05 +01:00
feature-gate-never_type.stderr Update never_type feature gate ui test 2024-02-01 20:01:05 +01:00
feature-gate-no_core.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-no_core.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-no_sanitize.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-no_sanitize.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-non_exhaustive_omitted_patterns_lint.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-non_exhaustive_omitted_patterns_lint.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-non_lifetime_binders.rs Add feature gate for non_lifetime_binders 2023-02-16 03:39:58 +00:00
feature-gate-non_lifetime_binders.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-object_safe_for_dispatch.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-object_safe_for_dispatch.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-offset-of-enum.rs Stabilize offset_of_nested 2024-07-29 17:50:12 +01:00
feature-gate-offset-of-enum.stderr Stabilize offset_of_nested 2024-07-29 17:50:12 +01:00
feature-gate-offset-of-slice.rs offset_of: allow (unstably) taking the offset of slice tail fields 2024-06-08 18:17:55 +02:00
feature-gate-offset-of-slice.stderr offset_of: allow (unstably) taking the offset of slice tail fields 2024-06-08 18:17:55 +02:00
feature-gate-omit-gdb-pretty-printer-section.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-omit-gdb-pretty-printer-section.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-optimize_attribute.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-optimize_attribute.stderr ast: Standardize visiting order for attributes and node IDs 2024-06-24 16:08:51 +03:00
feature-gate-overlapping_marker_traits.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-overlapping_marker_traits.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
feature-gate-patchable-function-entry.rs Updated code for changes to RFC, added additional error handling, added 2024-06-25 19:00:02 +02:00
feature-gate-patchable-function-entry.stderr Updated code for changes to RFC, added additional error handling, added 2024-06-25 19:00:02 +02:00
feature-gate-pattern-complexity.rs Add feature gate test for pattern_complexity attribute 2024-03-03 13:10:15 +01:00
feature-gate-pattern-complexity.stderr Add feature gate test for pattern_complexity attribute 2024-03-03 13:10:15 +01:00
feature-gate-postfix_match.rs Add postfix-match experimental feature 2024-03-05 23:34:45 -05:00
feature-gate-postfix_match.stderr Add postfix-match experimental feature 2024-03-05 23:34:45 -05:00
feature-gate-precise_pointer_size_matching.rs Match usize/isize exhaustively 2023-10-27 19:56:12 +02:00
feature-gate-precise_pointer_size_matching.stderr Remove the precise_pointer_size_matching feature gate 2023-12-04 11:56:21 +01:00
feature-gate-prelude_import.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-prelude_import.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-print-check-cfg.rs Add --print=check-cfg to get the expected configs 2024-04-25 07:58:31 +02:00
feature-gate-print-check-cfg.stderr Add --print=check-cfg to get the expected configs 2024-04-25 07:58:31 +02:00
feature-gate-profiler-runtime.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-profiler-runtime.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-public_private_dependencies.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-register_tool.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-register_tool.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-repr-simd.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-repr-simd.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-repr128.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-repr128.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-result_ffi_guarantees.rs Put the RFC behind a feature gate result_ffi_guarantees 2024-04-23 21:30:59 -07:00
feature-gate-result_ffi_guarantees.stderr Put the RFC behind a feature gate result_ffi_guarantees 2024-04-23 21:30:59 -07:00
feature-gate-return_type_notation.cfg.stderr Change RTN to use .. again 2024-06-28 14:20:43 -04:00
feature-gate-return_type_notation.no.stderr Change RTN to use .. again 2024-06-28 14:20:43 -04:00
feature-gate-return_type_notation.rs Change RTN to use .. again 2024-06-28 14:20:43 -04:00
feature-gate-rust_cold_cc.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-rust_cold_cc.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-rustc-allow-const-fn-unstable.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-rustc-allow-const-fn-unstable.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-rustc-attrs-1.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-rustc-attrs-1.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-rustc-attrs.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-rustc-attrs.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-rustc_const_unstable.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-rustc_const_unstable.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
feature-gate-rustc_encodable_decodable.rs Remove RustcEncodable/Decodable from 2024 prelude 2024-03-22 13:30:48 -07:00
feature-gate-rustc_encodable_decodable.stderr Remove RustcEncodable/Decodable from 2024 prelude 2024-03-22 13:30:48 -07:00
feature-gate-rustdoc_internals.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-rustdoc_internals.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-sha512_sm_x86.rs Add the sha512, sm3 and sm4 target features 2024-08-02 02:29:15 +05:30
feature-gate-sha512_sm_x86.stderr Add the sha512, sm3 and sm4 target features 2024-08-02 02:29:15 +05:30
feature-gate-shorter_tail_lifetimes.rs tail expression behind terminating scope 2024-06-18 04:14:43 +08:00
feature-gate-shorter_tail_lifetimes.stderr tail expression behind terminating scope 2024-06-18 04:14:43 +08:00
feature-gate-simd-ffi.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-simd-ffi.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-simd.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-simd.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-staged_api.rs Update since stability attributes in tests 2023-10-23 13:04:47 -07:00
feature-gate-staged_api.stderr ast: Standardize visiting order for attributes and node IDs 2024-06-24 16:08:51 +03:00
feature-gate-start.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-start.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-stmt_expr_attributes.rs tests: add tests for doc comments on expressions 2024-04-11 16:39:06 +00:00
feature-gate-stmt_expr_attributes.stderr expand: fix minor diagnostics bug 2024-04-22 16:28:20 +00:00
feature-gate-strict_provenance.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-strict_provenance.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-test_unstable_lint.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-test_unstable_lint.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-thread_local.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-thread_local.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-trace_macros.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-trace_macros.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-trait-alias.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-trait-alias.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-trait_upcasting.rs Revert "Auto merge of #118133 - Urgau:stabilize_trait_upcasting, r=WaffleLapkin" 2024-01-22 14:24:31 +00:00
feature-gate-trait_upcasting.stderr Revert "Auto merge of #118133 - Urgau:stabilize_trait_upcasting, r=WaffleLapkin" 2024-01-22 14:24:31 +00:00
feature-gate-transparent_unions.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-transparent_unions.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-trivial_bounds-lint.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-trivial_bounds.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-trivial_bounds.stderr Provide structured suggestion for #![feature(foo)] 2024-03-18 16:08:58 +00:00
feature-gate-try_blocks.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-try_blocks.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-type_alias_impl_trait.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-type_ascription.rs Rip it out 2023-05-01 16:15:13 +08:00
feature-gate-type_ascription.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-unboxed-closures-manual-impls.rs Rename HIR TypeBinding to AssocItemConstraint and related cleanup 2024-05-30 22:52:33 +02:00
feature-gate-unboxed-closures-manual-impls.stderr show fnsig's output when there is difference 2024-07-06 23:29:58 +08:00
feature-gate-unboxed-closures-method-calls.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-unboxed-closures-method-calls.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-unboxed-closures-ufcs-calls.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-unboxed-closures-ufcs-calls.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-unboxed-closures.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-unboxed-closures.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-unnamed_fields.rs Check representation of unnamed fields 2024-02-12 12:47:31 +08:00
feature-gate-unnamed_fields.stderr Check representation of unnamed fields 2024-02-12 12:47:31 +08:00
feature-gate-unsafe_pin_internals.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-unsafe_pin_internals.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
feature-gate-unsized-const-params.rs Split part of adt_const_params into unsized_const_params 2024-07-17 11:01:29 +01:00
feature-gate-unsized-const-params.stderr Split part of adt_const_params into unsized_const_params 2024-07-17 11:01:29 +01:00
feature-gate-unsized_fn_params.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-unsized_fn_params.stderr Track HirId instead of Span in ObligationCauseCode::SizedArgumentType 2024-01-03 18:59:42 +00:00
feature-gate-unsized_locals.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-unsized_locals.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
feature-gate-unsized_tuple_coercion.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-unsized_tuple_coercion.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-used_with_arg.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-used_with_arg.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-vectorcall.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-vectorcall.stderr Add tracking issue and unstable book page for "vectorcall" ABI 2024-04-28 19:27:05 +01:00
feature-gate-with_negative_coherence.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
feature-gate-with_negative_coherence.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
feature-gate-x86_amx_intrinsics.rs Add the feature gate and target-features 2024-07-11 19:00:49 -07:00
feature-gate-x86_amx_intrinsics.stderr Add the feature gate and target-features 2024-07-11 19:00:49 -07:00
feature-gate-xop_target_feature.rs Added the xop target feature and xop_target_feature gate 2024-07-12 23:30:22 +05:30
feature-gate-xop_target_feature.stderr Added the xop target feature and xop_target_feature gate 2024-07-12 23:30:22 +05:30
feature-gate-yeet_expr-in-cfg.rs Further cleanup cfgs in the UI test suite 2024-04-09 23:58:18 +02:00
feature-gate-yeet_expr-in-cfg.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gate-yeet_expr.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
feature-gate-yeet_expr.stderr Bless tests 2024-01-13 12:46:58 -05:00
feature-gated-feature-in-macro-arg.rs Continue to borrowck even if there were previous errors 2024-02-08 08:10:43 +00:00
feature-gated-feature-in-macro-arg.stderr Continue to borrowck even if there were previous errors 2024-02-08 08:10:43 +00:00
gated-bad-feature.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
gated-bad-feature.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-bench.rs Supress unhelpful diagnostics for unresolved top level attributes 2024-01-29 17:43:07 +08:00
issue-43106-gating-of-bench.stderr Supress unhelpful diagnostics for unresolved top level attributes 2024-01-29 17:43:07 +08:00
issue-43106-gating-of-builtin-attrs-error.rs Make early lints translatable 2024-05-21 20:16:39 +00:00
issue-43106-gating-of-builtin-attrs-error.stderr Make early lints translatable 2024-05-21 20:16:39 +00:00
issue-43106-gating-of-builtin-attrs.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-43106-gating-of-builtin-attrs.stderr resolve: Implement a lint for out-of-scope use of macro_rules 2024-06-24 17:12:08 +03:00
issue-43106-gating-of-deprecated.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-43106-gating-of-derive-2.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-derive-2.stderr Add a note to duplicate diagnostics 2023-10-05 01:04:41 +00:00
issue-43106-gating-of-derive.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-derive.stderr Bless tests 2024-01-13 12:46:58 -05:00
issue-43106-gating-of-macro_escape.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-43106-gating-of-macro_escape.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-macro_use.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-macro_use.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-proc_macro_derive.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-proc_macro_derive.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-stable.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-stable.stderr ast: Standardize visiting order for attributes and node IDs 2024-06-24 16:08:51 +03:00
issue-43106-gating-of-test.rs Supress unhelpful diagnostics for unresolved top level attributes 2024-01-29 17:43:07 +08:00
issue-43106-gating-of-test.stderr Supress unhelpful diagnostics for unresolved top level attributes 2024-01-29 17:43:07 +08:00
issue-43106-gating-of-unstable.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-43106-gating-of-unstable.stderr ast: Standardize visiting order for attributes and node IDs 2024-06-24 16:08:51 +03:00
issue-49983-see-issue-0.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-49983-see-issue-0.stderr Bless tests 2024-01-13 12:46:58 -05:00
rustc-private.rs Fix feature-gates/rustc-private.rs 2024-05-20 11:13:10 -04:00
rustc-private.stderr Fix feature-gates/rustc-private.rs 2024-05-20 11:13:10 -04:00
soft-syntax-gates-with-errors.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
soft-syntax-gates-with-errors.stderr Bless tests 2024-01-13 12:46:58 -05:00
soft-syntax-gates-without-errors.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
soft-syntax-gates-without-errors.stderr Bless tests 2024-01-13 12:46:58 -05:00
stability-attribute-consistency.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
stability-attribute-consistency.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
stable-features.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
stable-features.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
stmt_expr_attrs_no_feature.rs Move 100 entries from tests/ui into subdirs 2024-05-20 19:55:59 -07:00
stmt_expr_attrs_no_feature.stderr Move 100 entries from tests/ui into subdirs 2024-05-20 19:55:59 -07:00
test-listing-format-json.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
test-listing-format-json.run.stderr update tests for the test harness's json formatting 2023-04-21 15:34:38 +02:00
trace_macros-gate.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
trace_macros-gate.stderr Bless tests 2024-01-13 12:46:58 -05:00
unknown-feature.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
unknown-feature.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
unstable-attribute-allow-issue-0.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
unstable-attribute-allow-issue-0.stderr Move /src/test to /tests 2023-01-11 09:32:08 +00:00
version_check.rs Make RUSTC_OVERRIDE_VERSION_STRING overwrite the rendered version output, too 2024-07-30 14:08:02 +00:00