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Add long error explanation for E0667

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This commit is contained in:
Guillaume Gomez 2022-03-27 13:58:06 +02:00
parent 3fe3b89cd5
commit eae2903150
2 changed files with 19 additions and 1 deletions
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2
compiler/rustc_error_codes/src/error_codes.rs
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@ -394,6 +394,7 @@ E0663: include_str!("./error_codes/E0663.md"),
E0664: include_str!("./error_codes/E0664.md"),
E0665: include_str!("./error_codes/E0665.md"),
E0666: include_str!("./error_codes/E0666.md"),
E0667: include_str!("./error_codes/E0667.md"),
E0668: include_str!("./error_codes/E0668.md"),
E0669: include_str!("./error_codes/E0669.md"),
E0670: include_str!("./error_codes/E0670.md"),
@ -633,7 +634,6 @@ E0787: include_str!("./error_codes/E0787.md"),
// attribute
E0640, // infer outlives requirements
// E0645, // trait aliases not finished
E0667, // `impl Trait` in projections
// E0694, // an unknown tool name found in scoped attributes
// E0702, // replaced with a generic attribute input check
// E0707, // multiple elided lifetimes used in arguments of `async fn`

18
compiler/rustc_error_codes/src/error_codes/E0667.md Normal file
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@ -0,0 +1,18 @@
`impl Trait` is not allowed in path parameters.
Erroneous code example:
```compile_fail,E0667
fn some_fn(mut x: impl Iterator) -> <impl Iterator>::Item { // error!
x.next().unwrap()
}
```
You cannot use `impl Trait` in path parameters. If you want something
equivalent, you can do this instead:
```
fn some_fn<T: Iterator>(mut x: T) -> T::Item { // ok!
x.next().unwrap()
}
```