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Regression with <code>UnionType</code> as arg from 1.18.2 to 1.19.0

bugmypy got something wrongmypy got something wrong

Status: Open.

#20426 In python/mypy;

· mmiller-max opened on Dec 16, 2025

False positive error on <code>**kwargs</code> with <code>Mapping[Literal, Any]</code> type

bugmypy got something wrongmypy got something wrong

Status: Open.

#20424 In python/mypy;

· randolf-scholz opened on Dec 16, 2025

list of lists not inferred correctly

feature

topic-inferenceWhen to infer types or require explicit annotationsWhen to infer types or require explicit annotations

Status: Open.

#20420 In python/mypy;

· Dr-Irv opened on Dec 15, 2025

Errors on @overload in supertype signatures

bugmypy got something wrongmypy got something wrong

Status: Open.

#20418 In python/mypy;

· sveinse opened on Dec 15, 2025

Cannot determine type of walrus operator variable in list comprehension

bugmypy got something wrongmypy got something wrong

topic-callsFunction calls, *args, **kwargs, defaultsFunction calls, *args, **kwargs, defaults

topic-runtime-semanticsmypy doesn't model runtime semantics correctlymypy doesn't model runtime semantics correctly

Status: Open.

#20411 In python/mypy;

· radugheorman opened on Dec 14, 2025

The result of <code>type(TypeVar)</code> is not hashable

bugmypy got something wrongmypy got something wrong

Status: Open.

#20409 In python/mypy;

· arnimarj opened on Dec 13, 2025

unexpected attr-defined error in imports in dead code

bugmypy got something wrongmypy got something wrong

topic-reachabilityDetecting unreachable codeDetecting unreachable code

Status: Open.

#20408 In python/mypy;

· dlech opened on Dec 13, 2025

Cannot combine special types in alternative TypedDict syntax

bugmypy got something wrongmypy got something wrong

crash

topic-typed-dict

Status: Open.

#20401 In python/mypy;

· alicederyn opened on Dec 11, 2025

With a new syntax generic function, <code>T</code> cannot be used to set a default value to a parameter with <code>cast()</code> while <code>T</code> can be used for a parameter and return type

bugmypy got something wrongmypy got something wrong

pendingIssues that may be closedIssues that may be closed

Status: Open.

#20399 In python/mypy;

· hyperkai opened on Dec 11, 2025

[dev] wrong-version version tests disappear completely, but should probably skip instead

bugmypy got something wrongmypy got something wrong

topic-tests

Status: Open.

#20398 In python/mypy;

· wyattscarpenter opened on Dec 11, 2025

mypy does not narrow between Generic type[_T] and Callable[[Any], _T]

bugmypy got something wrongmypy got something wrong

Status: Open.

#20395 In python/mypy;

· aakhavanQC opened on Dec 11, 2025

Defaulted TypeVar cannot be set to Never?

bugmypy got something wrongmypy got something wrong

topic-pep-696TypeVar defaultsTypeVar defaults

Status: Open.

#20391 In python/mypy;

· alicederyn opened on Dec 10, 2025