/// A simple `assert` macro that works in `const fn`, for use until the
/// standard `assert` macro works in `const fn`.
///
/// TODO: Replace this with just `assert!`, once that's stable for use in
/// a `const fn` context.
#[allow(unused_macros)]
macro_rules! const_assert {
($x:expr) => {
let b: bool = $x;
let _ = [()][!b as usize];
};
}
#[test]
fn test_const_assert() {
const_assert!(true);
}