/// 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 asusize];};}#[test]fntest_const_assert(){const_assert!(true);}