bjoernager/rust
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Wrap dyn type with parentheses in suggestion

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long-long-float 2024-01-25 23:15:54 +09:00
parent 453ceafce3
commit 31e581ec12
10 changed files with 286 additions and 62 deletions
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16
compiler/rustc_infer/src/infer/error_reporting/mod.rs
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@ -2369,7 +2369,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
generic_param_scope = self.tcx.local_parent(generic_param_scope);
}
// type_param_sugg_span is (span, has_bounds)
// type_param_sugg_span is (span, has_bounds, needs_parentheses)
let (type_scope, type_param_sugg_span) = match bound_kind {
GenericKind::Param(ref param) => {
let generics = self.tcx.generics_of(generic_param_scope);
@ -2380,10 +2380,10 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
// instead we suggest `T: 'a + 'b` in that case.
let hir_generics = self.tcx.hir().get_generics(scope).unwrap();
let sugg_span = match hir_generics.bounds_span_for_suggestions(def_id) {
Some(span) => Some((span, true)),
Some((span, open_paren_sp)) => Some((span, true, open_paren_sp)),
// If `param` corresponds to `Self`, no usable suggestion span.
None if generics.has_self && param.index == 0 => None,
None => Some((self.tcx.def_span(def_id).shrink_to_hi(), false)),
None => Some((self.tcx.def_span(def_id).shrink_to_hi(), false, None)),
};
(scope, sugg_span)
}
@ -2406,12 +2406,18 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
let mut suggs = vec![];
let lt_name = self.suggest_name_region(sub, &mut suggs);
if let Some((sp, has_lifetimes)) = type_param_sugg_span
if let Some((sp, has_lifetimes, open_paren_sp)) = type_param_sugg_span
&& suggestion_scope == type_scope
{
let suggestion =
if has_lifetimes { format!(" + {lt_name}") } else { format!(": {lt_name}") };
suggs.push((sp, suggestion))
if let Some(open_paren_sp) = open_paren_sp {
suggs.push((open_paren_sp, "(".to_string()));
suggs.push((sp, format!("){suggestion}")));
} else {
suggs.push((sp, suggestion))
}
} else if let GenericKind::Alias(ref p) = bound_kind
&& let ty::Projection = p.kind(self.tcx)
&& let DefKind::AssocTy = self.tcx.def_kind(p.def_id)