Macro nice_debug_assert_eq 

macro_rules! nice_debug_assert_eq {
    ($left:expr, $right:expr $(,)?) => { ... };
    ($left:expr, $right:expr, $format:expr $(, $($args:tt)*)?) => { ... };
}

A debug_assert_eq!() analogue that prints the error with line number information instead of panicking. See nice_debug_assert!() for more information.