8000 Internal Error on runtime checkable protocol containing a class · Issue #10522 · python/mypy · GitHub
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Maxpxt opened this issue May 21, 2021 · 1 comment
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Internal Error on runtime checkable protocol containing a class #10522

Maxpxt opened this issue May 21, 2021 · 1 comment
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crash priority-0-high topic-protocols

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@Maxpxt
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Maxpxt commented May 21, 2021 •
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Crash Report

mypy crashed while checking a file defining a runtime checkable protocol that contained another class.

Traceback

mypy_bug.py:4: error: INTERNAL ERROR -- Please try using mypy master on Github:
https://mypy.rtfd.io/en/latest/common_issues.html#using-a-development-mypy-build
Please report a bug at https://github.com/python/mypy/issues
version: 0.812
Traceback (most recent call last):
  File "c:\programdata\anaconda3\envs\sar39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\programdata\anaconda3\envs\sar39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "mypy\checker.py", line 401, in accept
  File "mypy\nodes.py", line 950, in accept
  File "mypy\checker.py", line 1733, in visit_class_def
  File "mypy\checkmember.py", line 966, in type_object_type
  File "mypy\typeops.py", line 102, in type_object_type_from_function
  File "mypy\typeops.py", line 130, in class_callable
  File "mypy\subtypes.py", line 93, in is_subtype
  File "mypy\subtypes.py", line 135, in _is_subtype
  File "mypy\types.py", line 833, in accept
  File "mypy\subtypes.py", line 264, in visit_instance
  File "mypy\subtypes.py", line 539, in is_protocol_implementation
AssertionError:
mypy_bug.py:4: : note: use --pdb to drop into pdb

To Reproduce

Minimal code that causes the error:

from typing import Protocol, runtime_checkable

@runtime_checkable
class Foo(Protocol):
    class Bar:
        pass

Without @runtime_checkable, mypy runs fine.

Your Environment

  • Mypy version used: mypy 0.812.
  • Mypy command-line flags: None. The command was mypy mypy_bug.py --show-traceback.
  • Mypy configuration options from mypy.ini (and other config files): None. There was no configuration file.
  • Python version used: Python 3.9.2, from a conda (version 4.9.2) environment.
  • Operating system and version: Windows 10 Pro, version 20H2, build 19042.985.
@Maxpxt Maxpxt added the crash label May 21, 2021
@posita posita mentioned this issue Jun 3, 2021
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@ilevkivskyi
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I think this was fixed by my other PR, it works on master.

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@JukkaL @ilevkivskyi @Maxpxt @AlexWaygood
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