"error: Name is not defined" and confusing behavior on instance-level classes

Running mypy on the following example:

from typing import Type

class Foo:
    def __init__(self):
        class Bar:
            pass

        self.Bar: Type[Bar] = Bar

foo = Foo()
bar: foo.Bar = foo.Bar()

reveal_type(foo.Bar)
reveal_type(bar)

results in the following slightly confusing and seemingly contradictory output:

example.py:11: error: Name 'foo.Bar' is not defined  # on bar: foo.Bar
example.py:13: note: Revealed type is 'Type[example.Bar@5]'  # on reveal_type(foo.Bar)
example.py:14: note: Revealed type is 'Any'  # on reveal_type(bar)

Ideally, I would have expected reveal_type(bar) to reveal example.Bar@5. I'm not sure if there is a way to correctly type this code without resorting to # type: ignore right now.

Tested on mypy 0.761, Python 3.8.1.

使用 mypy 重现 example.py 中的示例，重点关注注解 bar: foo.Bar 和 reveal_type 调用。跟踪 mypy 如何处理实例级类引用，并确定能否将报告的错误和 Any 结果替换为预期的类型 example.Bar@5。完成标准是 example.py 按预期通过类型检查，并且 reveal_type(bar) 报告该类类型。