code: def build_extensions(self):
      # First, sanity-check the 'extensions' list
      self.check_extensions_list(self.extensions)
  
      for ext in self.extensions:
          ext.sources = self.cython_sources(ext.sources, ext)
      # Call original build_extensions
      _build_ext.build_ext.build_extensions(self)
  
imports: import inspect
  import sys
  import os
  from distutils.errors import DistutilsPlatformError
  from distutils.dep_util import newer, newer_group
  from distutils import log
  from distutils.command import build_ext
  from distutils import sysconfig
  import warnings
label_desc: Use image node_id 6 for calling the old_build_ext obj's underlying member method code with example usage: obj.build_extensions() without return types