def _ast_special_handling_to_code(self, special_handling, **kwargs):
    """Convert an AST sepcial handling to python source code."""
    ident = special_handling.value.svalue
    if ident in PB_SPECIAL_HANDLING:
      return ["PB.{0}".format(ident)]
    else:
      return ["self.{0}".format(ident)]