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Rollup merge of #118157 - Nadrieril:never_pat-feature-gate, r=compiler-errors

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Add `never_patterns` feature gate

This PR adds the feature gate and most basic parsing for the experimental `never_patterns` feature. See the tracking issue (https://github.com/rust-lang/rust/issues/118155) for details on the experiment.

`@scottmcm` has agreed to be my lang-team liaison for this experiment.
This commit is contained in:
Matthias Krüger 2023-11-29 12:34:47 +01:00 • committed by GitHub
commit c03f8917ee
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40 changed files with 325 additions and 18 deletions
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compiler/rustc_ast_lowering/src/pat.rs
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@ -24,6 +24,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
let node = loop {
match &pattern.kind {
PatKind::Wild => break hir::PatKind::Wild,
PatKind::Never => break hir::PatKind::Never,
PatKind::Ident(binding_mode, ident, sub) => {
let lower_sub = |this: &mut Self| sub.as_ref().map(|s| this.lower_pat(s));
break self.lower_pat_ident(pattern, *binding_mode, *ident, lower_sub);