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Wrap dyn type with parentheses in suggestion

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This commit is contained in:
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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27
compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
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@ -2938,17 +2938,28 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
_ => {}
};
// Didn't add an indirection suggestion, so add a general suggestion to relax `Sized`.
let (span, separator) = if let Some(s) = generics.bounds_span_for_suggestions(param.def_id)
{
(s, " +")
let (span, separator, open_paren_sp) =
if let Some((s, open_paren_sp)) = generics.bounds_span_for_suggestions(param.def_id) {
(s, " +", open_paren_sp)
} else {
(param.name.ident().span.shrink_to_hi(), ":", None)
};
let mut suggs = vec![];
let suggestion = format!("{separator} ?Sized");
if let Some(open_paren_sp) = open_paren_sp {
suggs.push((open_paren_sp, "(".to_string()));
suggs.push((span, format!("){suggestion}")));
} else {
(param.name.ident().span.shrink_to_hi(), ":")
};
err.span_suggestion_verbose(
span,
suggs.push((span, suggestion));
}
err.multipart_suggestion_verbose(
"consider relaxing the implicit `Sized` restriction",
format!("{separator} ?Sized"),
suggs,
Applicability::MachineApplicable,
);
}