bjoernager/rust
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Note pattern mismatch coming from for-loop desugaring

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This commit is contained in:
Michael Goulet 2022-05-29 13:01:42 -07:00
parent 9d1aeaeb82
commit 2e25c2346b
3 changed files with 51 additions and 1 deletions
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9
compiler/rustc_infer/src/infer/error_reporting/mod.rs
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@ -609,7 +609,14 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
if !matches!(ty.kind(), ty::Infer(ty::InferTy::TyVar(_) | ty::InferTy::FreshTy(_)))
{
// don't show type `_`
err.span_label(span, format!("this expression has type `{}`", ty));
if span.desugaring_kind() == Some(DesugaringKind::ForLoop)
&& let ty::Adt(def, substs) = ty.kind()
&& Some(def.did()) == self.tcx.get_diagnostic_item(sym::Option)
{
err.span_label(span, format!("this is an iterator with items of type `{}`", substs.type_at(0)));
} else {
err.span_label(span, format!("this expression has type `{}`", ty));
}
}
if let Some(ty::error::ExpectedFound { found, .. }) = exp_found
&& ty.is_box() && ty.boxed_ty() == found