@classmethod
  def is_filesystem_pair(cls, subject_type, product):
    """True if the given subject type and product type should be computed using a FileystemNode."""
    return cls._FS_PAIRS in (product, subject_type)
dataset/ETHPy150Open pantsbuild/pants/src/python/pants/engine/exp/nodes.py/FilesystemNode.is_filesystem_pair/swapped operands of `in`