E0744 - Error codes index
Description: Book listing all Rust error codes

# Error code E0744

#### Note: this error code is no longer emitted by the compiler.

An unsupported expression was used inside a const context.

Erroneous code example:

    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`.