Macro assert_approx_ne_rel 

macro_rules! assert_approx_ne_rel {
    ($lhs:expr, $rhs:expr $(,)?) => { ... };
    ($lhs:expr, $rhs:expr, message = $($arg:tt)+) => { ... };
    ($lhs:expr, $rhs:expr, $tol:expr, message = $($arg:tt)+) => { ... };
    ($lhs:expr, $rhs:expr, $tol:expr $(,)?) => { ... };
}

Asserts that two values are not approximately equal using ApproxEqRel. Pass a third argument to override the default relative tolerance, or message = ... to provide a custom assertion message while using the default tolerance.