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Rollup merge of #122120 - fmease:sugg-assoc-ty-bound-on-eq-bound, r=compiler-errors

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Suggest associated type bounds on problematic associated equality bounds

Fixes #105056. TL;DR: Suggest `Trait<Ty: Bound>` on `Trait<Ty = Bound>` in Rust >=2021.

~~Blocked on #122055 (stabilization of `associated_type_bounds`), I'd say.~~ (merged)
This commit is contained in:
Matthias Krüger 2024-03-26 21:23:47 +01:00 • committed by GitHub
commit ff8cdc9e14
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10 changed files with 287 additions and 99 deletions
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2
tests/ui/parser/recover/recover-assoc-lifetime-constraint.rs
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@ -1,6 +1,6 @@
#[cfg(FALSE)]
fn syntax() {
bar::<Item = 'a>(); //~ ERROR associated lifetimes are not supported
bar::<Item = 'a>(); //~ ERROR lifetimes are not permitted in this context
}
fn main() {}

17
tests/ui/parser/recover/recover-assoc-lifetime-constraint.stderr
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@ -1,12 +1,17 @@
error: associated lifetimes are not supported
--> $DIR/recover-assoc-lifetime-constraint.rs:3:11
error: lifetimes are not permitted in this context
--> $DIR/recover-assoc-lifetime-constraint.rs:3:18
|
LL | bar::<Item = 'a>();
| ^^^^^^^--
| |
| the lifetime is given here
| -------^^
| | |
| | lifetime is not allowed here
| this introduces an associated item binding
|
= help: if you meant to specify a trait object, write `dyn Trait + 'lifetime`
= help: if you meant to specify a trait object, write `dyn /* Trait */ + 'a`
help: you might have meant to write a bound here
|
LL | bar::<Item: 'a>();
| ~
error: aborting due to 1 previous error