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: Replace this with just `assert!`, once that's stable for use in 5 /// a `const fn` context. 6 #[allow(unused_macros)] 7 macro_rules! const_assert { 8 ($x:expr) => { 9 let b: bool = $x; 10 let _ = [()][!b as usize]; 11 }; 12 } 13 14 #[test] 15 #[allow(clippy::missing_const_for_fn)] test_const_assert()16fn test_const_assert() { 17 const_assert!(true); 18 } 19 20 #[test] test_const_assert_in_const_fn()21const fn test_const_assert_in_const_fn() { 22 const_assert!(true); 23 } 24