class_docstr: base class for Collector and Item the test collection tree.
  Collector subclasses have children, Items are terminal nodes.
code: def _prunetraceback(self, excinfo):
      pass
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import warnings
  import py
  import six
  import _pytest._code
  from _pytest.compat import getfslineno
  from _pytest.mark.structures import NodeKeywords
  from _pytest.outcomes import fail
label_desc: Use image node_id 18 for calling the Node obj's underlying member method code with example usage: obj._prunetraceback(excinfo) without return types