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Rollup merge of #133424 - Nadrieril:guard-patterns-parsing, r=fee1-dead

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Parse guard patterns

This implements the parsing of [RFC3637 Guard Patterns](https://rust-lang.github.io/rfcs/3637-guard-patterns.html) (see also [tracking issue](https://github.com/rust-lang/rust/issues/129967)). This PR is extracted from https://github.com/rust-lang/rust/pull/129996 with minor modifications.

cc `@max-niederman`
This commit is contained in:
Matthias Krüger 2024-12-08 17:18:50 +01:00 • committed by GitHub
commit 1868c8f66f
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31 changed files with 328 additions and 81 deletions
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2
compiler/rustc_expand/src/expand.rs
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@ -990,7 +990,7 @@ pub fn parse_ast_fragment<'a>(
}
}
AstFragmentKind::Ty => AstFragment::Ty(this.parse_ty()?),
AstFragmentKind::Pat => AstFragment::Pat(this.parse_pat_allow_top_alt(
AstFragmentKind::Pat => AstFragment::Pat(this.parse_pat_allow_top_guard(
None,
RecoverComma::No,
RecoverColon::Yes,