| #### Note: this error code is no longer emitted by the compiler. | |
| An unsupported expression was used inside a const context. | |
| Erroneous code example: | |
| ```ignore (removed error code) | |
| const _: i32 = { | |
| async { 0 }.await | |
| }; | |
| ``` | |
| 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 issue for [`async`] in `const fn`. | |
| [`async`]: https://github.com/rust-lang/rust/issues/69431 |