def __repr__(self):
        return "<NamedRequirements({}{})>".format(
            self.name,
            ", filename='{}'".format(self.filename.name) if self.filename
            else "")
def _roots(kindpats):
    """Returns root directories to match recursively from the given patterns."""
    roots, dirs = _patternrootsanddirs(kindpats)
    return roots