Emit single error for + use<'_> and don't suggest use<'static>
#135052
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rustbot
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Jan 3, 2025
| @@ -3118,7 +3121,9 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> { | |||
| } | |||
| } | |||
|
|
|||
| if num_params == 0 { | |||
| if in_precise_capture { | |||
| err.note("`use<...>` precise captures list require a named lifetime"); | |||
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that's not true. This works fine: fn foo(x: &u8) -> impl Sized + use<'_> {}.
| @@ -4,33 +4,26 @@ error[E0106]: missing lifetime specifier | |||
| LL | fn no_elided_lt() -> impl Sized + use<'_> {} | |||
| | ^^ expected named lifetime parameter | |||
| | | |||
| = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from | |||
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this should probably at least keep some explanation that justifies why '_ isn't valid without another lifetime which it can resolve to in the inputs.
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```
error[E0106]: missing lifetime specifier
--> $DIR/bad-lifetimes.rs:1:39
|
LL | fn no_elided_lt() -> impl Sized + use<'_> {}
| ^^ expected named lifetime parameter
|
help: consider introducing a named lifetime parameter
|
LL | fn no_elided_lt<'a>() -> impl Sized + use<'a> {}
| ++++ ~~
```
Fix rust-lang#134194.
estebank
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| ); | ||
| if in_precise_capture { | ||
| err.note( | ||
| "this function's return type specifies a borrowed `use<'_>` with an elided \ |
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"a borrowed use<'_>" feels really awkward. I think this can be a bit more direct. Perhaps something like:
"cannot capture elided lifetime with use<'_> when there is no lifetime in scope to capture"
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Fix #134194.
r? @compiler-errors