RecursionError: maximum recursion depth exceeded #17691
Labels
Comments
|
Refs bc39f17 |
|
Did you somehow managed to use mypy cache from an old mypy version? I thought mypy is smart enough to not do this, unless you are doing something tricky. |
|
Hi @ilevkivskyi , thank you for looking at this. Not trying to do anything tricky! I first found the segfault in CI on a clean GitHub Action run. Running it locally again after explicitly removing Happy to help investigate as needed. |
flexatone
changed the title
|
OK, now this is interesting. I have an idea of what may be going on, but it may take a while to find repro. Mypy should print file name and line number that caused the crash before the start of the traceback. You can try using this to find a minimal repro. |
|
Thanks, @ilevkivskyi , for the note on the line number. I have been able to create reproduceable snippet, below. This code has been around and passing for some time, at least on MyPy 1.9 and 1.10, and I have confirmed again it passes on 1.10. If I remove the recursive union component, the exception goes away. import typing as tp
TLabel = tp.Union[
tp.Hashable,
int,
bool,
float,
complex,
str,
bytes,
None,
tp.Tuple['TLabel'],
]
TLocSelectorNonContainer = tp.Union[
TLabel,
slice,
tp.List[TLabel],
]
def is_slice(value: TLocSelectorNonContainer) -> bool:
return value.__class__ is sliceNote that the following, simpler example, still using the recursive union, passes without exception. import typing as tp
TLabel = tp.Union[
tp.Hashable,
int,
bool,
float,
complex,
str,
bytes,
None,
tp.Tuple['TLabel'],
]
def is_none(value: TLabel) -> bool:
return value is None |
ilevkivskyi
added
topic-type-alias
|
Yeah, we recently switched tuple fallbacks from joins to unions, this obviously causes this issue. Btw while I am working on this, using |
|
Thank you for pointing that out: Making that change fixes the crash for me: much appreciated! |
|
In the meantime a bit simpler repro is from typing import Tuple, Union, Hashable, List
TLabel = Union[Hashable, Tuple[TLabel]]
TLabels = Union[TLabel, List[TLabel]]
x: TLabel
xs: TLabels = [x] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Crash Report
While I was having no problems with MyPy 1.10, with MyPy 1.11.0, 1.11.1 I get segmentation faults, and an exception with the code installed as:
By avoiding the segfaults, I get a
KeyError: 'expr'Traceback
To Reproduce
This results from running MyPy on a large code base that makes heavy use of
TypeVarTupleandUnpack. I cannot isolate the issue but this can be reproduced within the following PR:static-frame/static-frame#966
Your Environment
mypy --strictmypy.ini(and other config files): https://github.com/static-frame/static-frame/blob/e235c34c1a25a97a36e24e5c584049bd2df31ebb/pyproject.toml#L26The text was updated successfully, but these errors were encountered: