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Fix lifetime suggestion for type aliases with objects in them

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This commit is contained in:
Michael Goulet 2023-04-25 20:41:59 +00:00
parent 666fee2a5f
commit 183f1a6a70
4 changed files with 72 additions and 6 deletions
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16
compiler/rustc_borrowck/src/diagnostics/region_errors.rs
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@ -845,7 +845,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
return;
}
let Some((alias_tys, alias_span)) = self
let Some((alias_tys, alias_span, lt_addition_span)) = self
.infcx
.tcx
.return_type_impl_or_dyn_traits_with_type_alias(suitable_region.def_id) else { return; };
@ -858,10 +858,20 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
()
}
if let TyKind::TraitObject(_, lt, _) = alias_ty.kind {
spans_suggs.push((lt.ident.span.shrink_to_hi(), " + 'a".to_string()));
if lt.ident.name == kw::Empty {
spans_suggs.push((lt.ident.span.shrink_to_hi(), " + 'a".to_string()));
} else {
spans_suggs.push((lt.ident.span, "'a".to_string()));
}
}
}
spans_suggs.push((alias_span.shrink_to_hi(), "<'a>".to_string()));
if let Some(lt_addition_span) = lt_addition_span {
spans_suggs.push((lt_addition_span, "'a, ".to_string()));
} else {
spans_suggs.push((alias_span.shrink_to_hi(), "<'a>".to_string()));
}
diag.multipart_suggestion_verbose(
&format!(
"to declare that the trait object {captures}, you can add a lifetime parameter `'a` in the type alias"