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Rollup merge of #139035 - nnethercote:PatKind-Missing, r=oli-obk

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Add new `PatKind::Missing` variants

To avoid some ugly uses of `kw::Empty` when handling "missing" patterns, e.g. in bare fn tys. Helps with #137978. Details in the individual commits.

r? ``@oli-obk``
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Stuart Cook 2025-04-07 22:29:17 +10:00 • committed by GitHub
commit 82df6229b6
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42 changed files with 92 additions and 66 deletions
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compiler/rustc_ast_passes/src/ast_validation.rs
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@ -244,7 +244,7 @@ impl<'a> AstValidator<'a> {
fn check_decl_no_pat(decl: &FnDecl, mut report_err: impl FnMut(Span, Option<Ident>, bool)) {
for Param { pat, .. } in &decl.inputs {
match pat.kind {
PatKind::Ident(BindingMode::NONE, _, None) | PatKind::Wild => {}
PatKind::Missing | PatKind::Ident(BindingMode::NONE, _, None) | PatKind::Wild => {}
PatKind::Ident(BindingMode::MUT, ident, None) => {
report_err(pat.span, Some(ident), true)
}