code: def calc_is_empty(self, recur):
      return recur(self.returns)
  
file_path: catboost/contrib/python/hypothesis/py2/hypothesis/strategies/_internal/functions.py
imports: from __future__ import absolute_import, division, print_function
  from hypothesis.control import note
  from hypothesis.errors import InvalidState
  from hypothesis.internal.reflection import arg_string, nicerepr, proxies
  from hypothesis.strategies._internal.strategies import SearchStrategy
label_desc: Use image node_id 2 for calling the FunctionStrategy obj's underlying member method code with example usage: obj.calc_is_empty(recur) and returns: recur