bjoernager/rust
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Point at return type when it introduces 'static obligation

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This commit is contained in:
Esteban Kuber 2021-10-12 09:52:32 +00:00
parent 09dbf37213
commit ee0fd105d8
10 changed files with 142 additions and 0 deletions
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20
compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs
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@ -181,6 +181,26 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
if let SubregionOrigin::RelateParamBound(_, _, Some(bound)) = sub_origin {
err.span_note(*bound, "`'static` lifetime requirement introduced by this bound");
}
if let SubregionOrigin::Subtype(box TypeTrace { cause, .. }) = sub_origin {
if let ObligationCauseCode::BlockTailExpression(hir_id) = &cause.code {
let parent_id = tcx.hir().get_parent_item(*hir_id);
if let Some(fn_decl) = tcx.hir().fn_decl_by_hir_id(parent_id) {
let mut span: MultiSpan = fn_decl.output.span().into();
span.push_span_label(
fn_decl.output.span(),
"requirement introduced by this return type".to_string(),
);
span.push_span_label(
cause.span,
"because of this returned expression".to_string(),
);
err.span_note(
span,
"`'static` lifetime requirement introduced by the return type",
);
}
}
}
let fn_returns = tcx.return_type_impl_or_dyn_traits(anon_reg_sup.def_id);