Function expect_ok 

pub const fn expect_ok<T, E>(res: Result<T, E>, message: &str) -> T

Const version of Result::expect without the Debug formatting.

Can also be used in combination with Result::is_ok to match the result.

Example

use const_util::result::expect_ok;
const fn double<E>(res: Result<i32, E>) -> Result<i32, E> {
    if res.is_ok() {
        Ok(2 * expect_ok(res, "Unreachable"))
    } else {
        res
    }
}
assert_eq!(double(Ok::<_, String>(1)), Ok(2));