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Add "in this derive macro expansion" to missing Display errors

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David Tolnay 2024-12-07 08:56:02 -08:00
parent 714229d821
commit 07e7d990fa
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2 changed files with 5 additions and 3 deletions
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2
impl/src/expand.rs
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@ -496,7 +496,7 @@ fn impl_enum(input: Enum) -> TokenStream {
// deprecated type without triggering deprecation warning on the generated impl.
fn call_site_ident(ident: &Ident) -> Ident {
let mut ident = ident.clone();
ident.set_span(Span::call_site());
ident.set_span(ident.span().resolved_at(Span::call_site()));
ident
}

6
tests/ui/missing-display.stderr
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@ -1,8 +1,10 @@
error[E0277]: `MyError` doesn't implement `std::fmt::Display`
--> tests/ui/missing-display.rs:3:10
--> tests/ui/missing-display.rs:4:10
|
3 | #[derive(Error, Debug)]
| ^^^^^ `MyError` cannot be formatted with the default formatter
| ----- in this derive macro expansion
4 | pub enum MyError {
| ^^^^^^^ `MyError` cannot be formatted with the default formatter
|
= help: the trait `std::fmt::Display` is not implemented for `MyError`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead