Macro assert_cmp::debug_assert_fn

macro_rules! debug_assert_fn {
    ($function:ident($left:expr, $right:expr)) => { ... };
    (not $function:ident($left:expr, $right:expr)) => { ... };
}

Assert that a binary function call of 2 expressions returns true.

This macro is the debug-only version of assert_fn. It acts like assert_op_expr in debug mode, but does nothing in release mode.