Allow #[must_use] on traits
Addresses https://github.com/rust-lang/rust/issues/55506, but we'll probably want to add it to some library traits like `Iterator` before the issue is considered fixed. Fixes https://github.com/rust-lang/rust/issues/51560.
`#[must_use]` is already permitted on traits, with no effect, so this seems like a bug fix, but I might be overlooking something. This currently warns for `impl Trait` or `dyn Trait` when the `Trait` is `#[must_use]` (although I don't think the latter is currently possible, so it's simply future-proofed).
Add temporary renames to manifests for rustfmt/clippy
This will be part of our strategy for shipping renamed versions of these
components for the Rust 2018 edition.
Closes#55967
Fix stability hole with `static _`
The `underscore_const_names` only gated const items with `_` as the name.
`static _: () = ();` works on beta without feature gates right now, this PR fixes that.
Revert #51601Closes: #55985
Specialization of `StepBy<Range(Inclusive)>` results in an incorrectly behaving code when `step_by` is combined with `skip` or `nth`.
If this will get merged we probably should reopen issues previously closed by #51601 (if there was any).
This commit implements WebAssembly/tool-conventions#65 for wasm files
produced by the Rust compiler. This adds a bit of metadata to wasm
modules to indicate that the file's language includes Rust and the
file's "processed-by" tools includes rustc.
The thinking with this section is to eventually have telemetry in
browsers tracking all this.
Ignore non-semantic tokens for 'probably_eq' streams.
Improves the situation in #43081 by skipping typically non-semantic tokens when checking for 'probably_eq'.
r? @alexcrichton
