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rust/tests/ui/parser
Jonathan Brouwer 4b2aa6d93b Rollup merge of #154527 - fmease:more-soft-gates, r=nnethercote
Emit pre-expansion feature gate warnings for negative impls and specialization

Follow up to rust-lang/rust#154475; part of rust-lang/rust#154045.

This shouldn't need any extra input from T-compiler or T-lang since it's legitimized by [MCP 535](https://github.com/rust-lang/compiler-team/issues/535).

However, I have a feeling that negative impls & specialization behind "`#[cfg(feature = "nightly")]`" are more prevalent in the ecosystem compared to e.g., auto traits & box patterns, so these new warnings will probably hit a bunch of users. In any case, it's only a warning for now not an error so e.g., running crater "in deny mode" or nominating for a T-lang meeting discussion would be disproportionate (esp. since T-lang [has confirmed in the past](https://github.com/rust-lang/rust/pull/116393#issuecomment-1745571299) that this is a T-compiler matter).
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