core::assert! [-]  [+] [src]

macro_rules! assert {
    ($cond:expr) => (
        if !$cond {
            panic!(concat!("assertion failed: ", stringify!($cond)))
        }
    );
    ($cond:expr, $($arg:tt)*) => (
        if !$cond {
            panic!($($arg)*)
        }
    );
}

Runtime assertion, for details see std::macros