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subtle cache corruption when using dataclass transform leading to Cannot determine type of "<my-dataclass-transform>" [has-type] and a big complicated codebase (Pomodouroboros)

bugmypy got something wrongmypy got something wrong

Status: Open.

#21043 In python/mypy;

· glyph opened on Mar 18, 2026

Tuple comparison does not check comparability of element types

bugmypy got something wrongmypy got something wrong

Status: Open.

#21042 In python/mypy;

· ktbarrett opened on Mar 18, 2026

[i386/i686] Fatal Python error: Segmentation fault while running the tests

crash

Status: Open.

#21040 In python/mypy;

· mr-c opened on Mar 18, 2026

Classes inheriting from NamedTuple can't have ParamSpec as generic type parameter

bugmypy got something wrongmypy got something wrong

Status: Open.

#21039 In python/mypy;

· jonded94 opened on Mar 18, 2026

Undefined names used as decorators on top of TypedDict are not reported

bugmypy got something wrongmypy got something wrong

semantic-analyzerProblems that happen during semantic analysisProblems that happen during semantic analysis

topic-typed-dict

Status: Open.

#21030 In python/mypy;

· bzoracler opened on Mar 17, 2026

iter(...) is not revealed the same as __iter__ method

bugmypy got something wrongmypy got something wrong

Status: Open.

#21027 In python/mypy;

· loicdiridollou opened on Mar 16, 2026

stubtest doesn't expand **kwargs: Unpack[...]

bugmypy got something wrongmypy got something wrong

topic-stubtest

topic-typed-dict

Status: Open.

#21023 In python/mypy;

· jbytheway opened on Mar 15, 2026

Protocol incorrectly matches when positional or keyword parameter matches *args

bugmypy got something wrongmypy got something wrong

Status: Open.

#21014 In python/mypy;

· danielknell opened on Mar 12, 2026

Setting only * to an empty parameter list gets a wrong error message saying "arguments" instead of "parameters"

bugmypy got something wrongmypy got something wrong

Status: Open.

#21003 In python/mypy;

· hyperkai opened on Mar 10, 2026

Move error messages for keyword arguments with ParamSpec

feature

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#21001 In python/mypy;

· A5rocks opened on Mar 10, 2026

[PEP 695] Incorrect Variance Computation with Self | other return type

bugmypy got something wrongmypy got something wrong

Status: Open.

#20997 In python/mypy;

· randolf-scholz opened on Mar 9, 2026

Why the GitHub Action installs project dependencies via pip download + pip install --find-links

documentation

question

topic-developerIssues relevant to mypy developersIssues relevant to mypy developers

Status: Open.

#20990 In python/mypy;

· fynxiu opened on Mar 8, 2026