Method build_if_equal

utils/src/pairs.rs:127–129

(left: &'left [Left], right: &'right [Right])

    }

    fn build_if_equal(left: &'left [Left], right: &'right [Right]) -> Option<Self> {
        (left.len() == right.len()).then_some(Self { right, left })
    }
}

impl<'left, 'right, Left, Right> TryFrom<(&'left [Left], &'right [Right])>