Emit warnings for unused fields in custom targets.
Add a warning which lists any fields in a custom target `json` file that aren't used. Currently unrecognized fields are ignored so, for example, a typo in the `json` will silently produce a target which isn't the one intended.
Do not emit alloca for ZST locals with multiple assignments
This extends 35566bfd7d to additionally stop emitting unnecessary allocas for zero sized locals that are assigned multiple times.
When rebuilding the standard library with `-Zbuild-std` this reduces the number of locals that require an allocation from 62315 to 61767.
Replace some `std::iter::repeat` with `str::repeat`
I noticed that there were some instances where `std::iter::repeat` would be used to repeat a string or a char to take a specific count of it and then collect it into a `String` when `str::repeat` is actually much faster and better for that.
See also: https://github.com/rust-lang/rust-clippy/issues/7260.
Add pattern walking support to THIR walker
Suggested in https://github.com/rust-lang/rust/pull/85263#issuecomment-861906730, this splits off the support for pattern walking in THIR from #85263. This has no observable effect on THIR unsafety checking, since it is not currently possible to trigger unsafety from the THIR checker using the additional patterns or constants that are now walked. THIR patterns are walked in source code order.
r? `@LeSeulArtichaut`
Fix ICE with `#[repr(simd)]` on enum
This pull request fixes#83505. `#[repr(simd)]` may only be applied to structs, which correctly causes `E0517` for the example given in #83505, but the compiler attempts to recover from this error, which leads to an ICE later, when `.non_enum_variant()` is called on the `AdtDef`. I have added a check that prevents this from happening.
make UB during CTFE a hard error
This is a next step for https://github.com/rust-lang/rust/issues/71800. `const_err` has been a future-incompatibility lint for 4 months now since https://github.com/rust-lang/rust/pull/80394 (and err-by-default for many years before that), so I think we could try making it a proper hard error at least in some situations.
I didn't yet adjust the tests, since I first want to gauge the fall-out via crater.
Cc `@rust-lang/wg-const-eval`
Remove some last remants of {push,pop}_unsafe!
These macros have already been removed, but there was still some code handling these macros. That code is now removed.
Provide option for specifying the profiler runtime
Currently, if `-Zinstrument-coverage` is enabled, the target is linked
against the `library/profiler_builtins` crate (which pulls in LLVM's
compiler-rt runtime).
This option enables backends to specify an alternative runtime crate for
handling injected instrumentation calls.
Use `AttrVec` for `Arm`, `FieldDef`, and `Variant`
Uses `AttrVec` for `Arm`, `FieldDef`, and `Variant`, i.e., where the size of the vector can be empty often.
Skips `Crate` and `Item` because I think they may have the attributes on common cases and need more work outside of `rustc_ast` (e.g. rustc_expand needs a lot of tweaks). But if it's reasonable to change, I'm happy to do so.
Fixes#77662
Fix ICE when using `#[doc(keyword = "...")]` on non-items
This pull request fixes#83512. The code for checking attributes calls `expect_item()` when it shouldn't, thus causing an ICE. I have implemented a proper check for the node kind, so that an error is reported instead of the ICE.
Make `s` pre-interned
Now we should be able to pre-intern `s` as the test `ui/lint/rfc-2457-non-ascii-idents/lint-confusable-idents.rs` no longer fails.
Prefer `partition_point` to look up assoc items
Since we now have `partition_point` (instead of `equal_range`), I think it's worth trying to use it instead of manually finding it.
`partition_point` uses `binary_search_by` internally (#85406) and its performance has been improved (#74024), so I guess this will make a performance difference.
Use better error message for hard errors in CTFE
I noticed this while working on #86255: currently the same message is used for hard errors and soft errors in CTFE. This changes the error messages to make hard errors use a message that indicates the reality of the situation correctly, since usage of the constant is never allowed when there was a hard error evaluating it. This doesn't affect the behaviour of these error messages, only the content.
This changes the error logic to check if the error should be hard or soft where it is generated, instead of where it is emitted, to allow this distinction in error messages.
Replace parent substs of associated types with inference vars in borrow checker
Fixes https://github.com/rust-lang/rust/issues/83190
Fixes https://github.com/rust-lang/rust/issues/78450
When we normalize an associated type that refers to an opaque type, it can happen that the substs of the associated type do not occur in the projection (they are parent substs). We previously didn't replace those substs with inference vars, which left a concrete region after all regions should have already been replaced with inference vars and triggered a `delay_span_bug`. After we normalize the opaque type, we now try to replace any remaining concrete regions with inference vars.
Handle C-variadic arguments properly when reporting region errors
This pull request fixes#86053. The issue is that for a C-variadic function
```rust
#![feature(c_variadic)]
unsafe extern "C" fn foo(_: (), ...) {}
```
`foo`'s signature will contain only the first parameter (and have `c_variadic` set to `true`), whereas its body has a second argument (a `hir::Pat` for the `...`).
The code for reporting region errors iterates over the body's parameters and tries to fetch the corresponding parameter from the signature; this causes an out-of-bounds ICE for the `...` (though not in the example above, because there are no region errors to report).
I have simply restricted the iteration over the body parameters to exclude `...`, which is fine because `...` cannot cause a region error.
