1/// A simple `assert` macro that works in `const fn`, for use until the
2/// standard `assert` macro works in `const fn`.
3///
4/// TODO: With Rust 1.58 we can replace this with just `assert!`.
5#[allow(unused_macros)]
6macro_rules! const_assert {
7 ($x:expr) => {
8 let b: bool = $x;
9 let _ = [()][!b as usize];
10 };
11}
12
13#[test]
14#[allow(clippy::missing_const_for_fn)]
15fn test_const_assert() {
16 const_assert!(true);
17}
18
19#[test]
20const fn test_const_assert_in_const_fn() {
21 const_assert!(true);
22}
23