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Special note for str in auto traits

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This commit is contained in:
Michael Goulet 2023-02-14 21:19:39 +00:00
parent 3560e65c44
commit 53fb433652
2 changed files with 2 additions and 1 deletions
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1
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -3107,6 +3107,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
self.tcx.def_span(def_id), self.tcx.def_span(def_id),
"required because it's used within this closure", "required because it's used within this closure",
), ),
ty::Str => err.note("`str` is considered to contain a `[u8]` slice for auto trait purposes"),
_ => err.note(&msg), _ => err.note(&msg),
}; };
} }

2
tests/ui/auto-traits/str-contains-slice-conceptually.stderr
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@ -4,7 +4,7 @@ error[E0277]: the trait bound `[u8]: AutoTrait` is not satisfied in `str`
LL | needs_auto_trait::<str>(); LL | needs_auto_trait::<str>();
| ^^^ within `str`, the trait `AutoTrait` is not implemented for `[u8]` | ^^^ within `str`, the trait `AutoTrait` is not implemented for `[u8]`
| |
= note: required because it appears within the type `str` = note: `str` is considered to contain a `[u8]` slice for auto trait purposes
note: required by a bound in `needs_auto_trait` note: required by a bound in `needs_auto_trait`
--> $DIR/str-contains-slice-conceptually.rs:8:24 --> $DIR/str-contains-slice-conceptually.rs:8:24
| |