Macro approx::assert_relative_ne

macro_rules! assert_relative_ne {
    ($given : expr, $expected : expr $(, $opt : ident = $val : expr) *) => { ... };
    ($given : expr, $expected : expr $(, $opt : ident = $val : expr) *,) => { ... };
}

An assertion that delegates to relative_ne!, and panics with a helpful error on failure.