parameters: (self)
return_statement: return self.get_last_node().new_child()
docstring: Create a new Tree_node and add to the 'leftmost' variation.
  
          Returns the new node.
docstring_summary: Create a new Tree_node and add to the 'leftmost' variation.
docstring_tokens: Create a new Tree_node and add to the leftmost variation .
function: def extend_main_sequence(self):
          """Create a new Tree_node and add to the 'leftmost' variation.
  
          Returns the new node.
  
          """
          return self.get_last_node().new_child()
function_tokens: def extend_main_sequence ( self ) : return self . get_last_node ( ) . new_child ( )