docs: def is_end_node(node):
      """Checks if a node is the "end" keyword.
  
      Args:
          node: AST node.
  
      Returns:
          True if the node is the "end" keyword, otherwise False.
      """
      return (isinstance(node, ast.Expr) and
              isinstance(node.value, ast.Name) and
              node.value.id == 'end')