class_docstr: Contains the error value.
class_docstr_tok: ["Contains","the","error","value","."]
code: def map_or(self, default: U, op: Callable[[T], U]) -> U:
      return default
  
imports: from __future__ import annotations
  from abc import ABC, abstractmethod, abstractproperty
  from typing import Any, Callable, cast, Generic, NoReturn, Optional, TypeVar, Union
label_desc: Use image node_id 12 for calling the Err obj's underlying member method code with example usage: obj.map_or(default, op) and returns: default