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Rollup merge of #138482 - nnethercote:fix-hir-printing, r=compiler-errors

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Fix HIR printing of parameters

HIR pretty printing does the wrong thing for anonymous parameters, and there is no test coverage for it. This PR remedies both of those things.

r? ``@lcnr``
This commit is contained in:
León Orell Valerian Liehr 2025-03-15 00:18:25 +01:00 • committed by GitHub
commit 370f8fb99d
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8 changed files with 115 additions and 24 deletions
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9
compiler/rustc_ast_lowering/src/lib.rs
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@ -1516,7 +1516,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
fn lower_fn_params_to_names(&mut self, decl: &FnDecl) -> &'hir [Ident] {
self.arena.alloc_from_iter(decl.inputs.iter().map(|param| match param.pat.kind {
PatKind::Ident(_, ident, _) => self.lower_ident(ident),
_ => Ident::new(kw::Empty, self.lower_span(param.pat.span)),
PatKind::Wild => Ident::new(kw::Underscore, self.lower_span(param.pat.span)),
_ => {
self.dcx().span_delayed_bug(
param.pat.span,
"non-ident/wild param pat must trigger an error",
);
Ident::new(kw::Empty, self.lower_span(param.pat.span))
}
}))
}