@abstractmethod
  def _listdir_raw(self, relpath):
Returns True if the passed in function is identified as a method (NOT a function)
dataset/ETHPy150Open pantsbuild/pants/src/python/pants/base/project_tree.py/ProjectTree._listdir_raw--crossover with--dataset/ETHPy150Open timothycrosley/hug/hug/introspect.py/is_method