Get rid of niche selection's dependence on fields's order
Fixes#125630.
Use the optimal niche selection decided in `univariant()` rather than picking niche field manually.
r? `@the8472`
Rollup of 3 pull requests
Successful merges:
- #130485 (Do not expect infer/bound/placeholder/error in v0 symbol mangling)
- #130567 (Register tool docs for compiletest)
- #130582 (rustdoc: use the correct span for doctests)
r? `@ghost`
`@rustbot` modify labels: rollup
Register tool docs for compiletest
This PR registers tool docs for `src/tools/compiletest`, meaning that
```
$ ./x doc src/tools/compiletest
```
or
```
$ ./x doc compiletest
```
will now generate docs, like for `run-make-support`.
Fixes#130564.
Do not expect infer/bound/placeholder/error in v0 symbol mangling
Infer/bound/placeholder/error are not encounterable during codegen. Let's make sure v0 symbol mangling doesn't "accidentally" handle them.
As for aliases (namely: projections and uv consts) these may still be encounterable because of the way that we render the def paths of items. Specifically, when we have something like:
```
struct W<T>(T);
impl<T> W<T> {
fn x() {
fn y() {}
}
}
```
The path of `y` is rendered like `crate_name::W<T>:❌:y`. Specifically, since `y` doesn't inherit the generics of the impl, we use the *identity* substitutions for that impl. If the impl has any aliases, they will remain unnormalized if they're rigid.
r? `@BoxyUwU`
[perf] skip normalizing param env if it is already normalized
If the param env is already normalized after elaboration, then we can skip a bunch of expensive operations.
> [!note]
> This makes it so that outlives predicates are no longer sorted after non-outlives predicates. Surely this won't make a semantic difference.
r? ghost
The comment here about 48 bit addresses being enough was written in 2016
but was made incorrect in 2019 by 5-level paging, and then persisted for
another 5 years before being noticed and corrected.
Generating a call to `as_mut()` let to more restrictive borrows than
what reborrowing usually gives us. Instead, we change the desugaring to
reborrow the pin internals directly which makes things more expressive.
Rollup of 5 pull requests
Successful merges:
- #128001 (Improve documentation for <integer>::from_str_radix)
- #130553 ([Clippy] Get rid of most `std` `match_def_path` usage, swap to diagnostic items.)
- #130554 (`pal::unsupported::process::ExitCode`: use an `u8` instead of a `bool`)
- #130556 (Mark the `link_cfg` feature as internal)
- #130558 (Support 128-bit atomics on s390x)
r? `@ghost`
`@rustbot` modify labels: rollup
Mark the `link_cfg` feature as internal
This PR marks the `link_cfg` feature as internal because it's a perme-unstable feature, only used by `core`/`std`and `unwind`.
`pal::unsupported::process::ExitCode`: use an `u8` instead of a `bool`
`ExitCode` should “represents the status code the current process can return to its parent under normal termination”, but is currently represented as a `bool` on unsupported platforms, making the `impl From<u8> for ExitCode` lossy.
Fixes#130532.
History: [IRLO thread](https://internals.rust-lang.org/t/mini-pre-rfc-redesigning-process-exitstatus/5426) (`ExitCode` as a `main` return), #48618 (initial impl), #93445 (`From<u8>` impl).
[Clippy] Get rid of most `std` `match_def_path` usage, swap to diagnostic items.
Part of https://github.com/rust-lang/rust-clippy/issues/5393.
This was going to remove all `std` paths, but `SeekFrom` has issues being cleanly replaced with a diagnostic item as the paths are for variants, which currently cannot be diagnostic items.
This also, as a last step, categories the paths to help with future path removals.
Improve documentation for <integer>::from_str_radix
Two improvements to the documentation:
- Document `-` as a valid character for signed integer destinations
- Make the documentation even more clear that extra whitespace and non-digit characters is invalid. Many other languages, e.g. c++, are very permissive in string to integer routines and simply try to consume as much as they can, ignoring the rest. This is trying to make the transition for developers who are used to the conversion semantics in these languages a bit easier.
Previously compiletest's `runtest.rs` was a massive 4700 lines file that
made reading and navigation very awkward.
This commit intentionally does not neatly reorganize where all the
methods on `TestCx` goes, that is intended for a follow-up PR.
