[rustc.git] / src / librustc_error_codes / error_codes / E0760.md

`async fn`/`impl trait` return type cannot contain a projection
or `Self` that references lifetimes from a parent scope.

Erroneous code example:

```compile_fail,E0760,edition2018
struct S<'a>(&'a i32);

impl<'a> S<'a> {
    async fn new(i: &'a i32) -> Self {
        S(&22)
    }
}
```

To fix this error we need to spell out `Self` to `S<'a>`:

```edition2018
struct S<'a>(&'a i32);

impl<'a> S<'a> {
    async fn new(i: &'a i32) -> S<'a> {
        S(&22)
    }
}
```

This will be allowed at some point in the future,
but the implementation is not yet complete.
See the [issue-61949] for this limitation.

[issue-61949]: https://github.com/rust-lang/rust/issues/61949
Commit	Line	Data
f035d41b XL	1	`async fn`/`impl trait` return type cannot contain a projection
	2	or `Self` that references lifetimes from a parent scope.
	3
	4	Erroneous code example:
	5
	6	```compile_fail,E0760,edition2018
	7	struct S<'a>(&'a i32);
	8
	9	impl<'a> S<'a> {
	10	async fn new(i: &'a i32) -> Self {
	11	S(&22)
	12	}
	13	}
	14	```
	15
	16	To fix this error we need to spell out `Self` to `S<'a>`:
	17
	18	```edition2018
	19	struct S<'a>(&'a i32);
	20
	21	impl<'a> S<'a> {
	22	async fn new(i: &'a i32) -> S<'a> {
	23	S(&22)
	24	}
	25	}
	26	```
	27
	28	This will be allowed at some point in the future,
	29	but the implementation is not yet complete.
	30	See the [issue-61949] for this limitation.
	31
	32	[issue-61949]: https://github.com/rust-lang/rust/issues/61949