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Update error code description

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This commit is contained in:
Jonas Schievink 2021-07-30 00:33:30 +02:00
parent 550948c553
commit c5a29f9245
1 changed files with 4 additions and 14 deletions
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18
compiler/rustc_error_codes/src/error_codes/E0744.md
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@ -2,25 +2,15 @@ An unsupported expression was used inside a const context.
Erroneous code example: Erroneous code example:
```compile_fail,E0744 ```compile_fail,edition2018,E0744
const _: i32 = { const _: i32 = {
let mut x = 0; async { 0 }.await
for i in 0..4 { // error!
x += i;
}
}; };
``` ```
At the moment, `for` loops, `.await`, and the `Try` operator (`?`) are forbidden At the moment, `.await` is forbidden inside a `const`, `static`, or `const fn`.
inside a `const`, `static`, or `const fn`.
This may be allowed at some point in the future, but the implementation is not This may be allowed at some point in the future, but the implementation is not
yet complete. See the tracking issues for [`async`] and [`?`] in `const fn`, and yet complete. See the tracking issue for [`async`] in `const fn`.
(to support `for` loops in `const fn`) the tracking issues for [`impl const
Trait for Ty`] and [`&mut T`] in `const fn`.
[`async`]: https://github.com/rust-lang/rust/issues/69431 [`async`]: https://github.com/rust-lang/rust/issues/69431
[`?`]: https://github.com/rust-lang/rust/issues/74935
[`impl const Trait for Ty`]: https://github.com/rust-lang/rust/issues/67792
[`&mut T`]: https://github.com/rust-lang/rust/issues/57349