Function range_relation 

pub fn range_relation<T, R: GetBeginEnd<T>, N: GetBeginEnd<T>, C: CpCmp<T>>(
    a: &R,
    b: &N,
    t: &C,
) -> RangeRelation<()>

Compares the positional relationship between a and b.

• RangeRelation::Invalid a was not a valid range.
• RangeRelation::Before a is before b.
• RangeRelation::After a is after b.
• RangeRelation::Overlap a and b overlap to some degree.