# Error code E0744

An unsupported expression was used inside a const context.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    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`.