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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:
```compile_fail,E0744
```compile_fail,edition2018,E0744
const _: i32 = {
let mut x = 0;
for i in 0..4 { // error!
x += i;
}
async { 0 }.await
};
```
At the moment, `for` loops, `.await`, and the `Try` operator (`?`) are forbidden
inside a `const`, `static`, or `const fn`.
At the moment, `.await` is forbidden inside a `const`, `static`, or `const fn`.
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
(to support `for` loops in `const fn`) the tracking issues for [`impl const
Trait for Ty`] and [`&mut T`] in `const fn`.
yet complete. See the tracking issue for [`async`] in `const fn`.
[`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