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Tune parallel parsing performance on macOS

feature

parallel checking

Status: Open.

#21215 In python/mypy;

· JukkaL opened on Apr 13, 2026

Incorrect type parameter scope inference with nested classes

bugmypy got something wrongmypy got something wrong

topic-pep-695Issues related to PEP 695 syntaxIssues related to PEP 695 syntax

Status: Open.

#21210 In python/mypy;

· jonathandung opened on Apr 13, 2026

[1.20 regression] narrowing failure with unrelated boolean

bugmypy got something wrongmypy got something wrong

topic-type-narrowingConditional type narrowing / binderConditional type narrowing / binder

Status: Open.

#21204 In python/mypy;

· AA-Turner opened on Apr 12, 2026

[1.20 regression] Too aggressive type narrowing with type variables and equality

bugmypy got something wrongmypy got something wrong

topic-type-narrowingConditional type narrowing / binderConditional type narrowing / binder

topic-type-variables

Status: Open.

#21199 In python/mypy;

· kdarnok opened on Apr 10, 2026

[1.20 regression] Type narrowing is order sensitive in match-case statement with narrowed enum type

bugmypy got something wrongmypy got something wrong

Status: Open.

#21187 In python/mypy;

· SebastiaanZ opened on Apr 8, 2026

[1.20 regression] unreachable regression with generic Callable

bugmypy got something wrongmypy got something wrong

topic-reachabilityDetecting unreachable codeDetecting unreachable code

Status: Open.

#21182 In python/mypy;

· dpinol opened on Apr 7, 2026

[1.20 regression] when same object is narrowed multiple times

bugmypy got something wrongmypy got something wrong

topic-type-narrowingConditional type narrowing / binderConditional type narrowing / binder

Status: Open.

#21181 In python/mypy;

· ktbarrett opened on Apr 7, 2026

python-version based syntax checks should not block

feature

topic-error-reportingHow we report errorsHow we report errors

topic-pep-695Issues related to PEP 695 syntaxIssues related to PEP 695 syntax

Status: Open.

#21178 In python/mypy;

· A5rocks opened on Apr 6, 2026

Overlapping overloads false positive with ParamSpec shenanigans

bugmypy got something wrongmypy got something wrong

topic-overloads

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

Status: Open.

#21171 In python/mypy;

· jonathandung opened on Apr 5, 2026

Surprising results from the HTML report

Status: Open.

#21168 In python/mypy;

· wyattscarpenter opened on Apr 4, 2026

mypy does not recognise from ... import inside an IntEnum class body as producing enum members.

feature

topic-enum

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

Status: Open.

#21146 In python/mypy;

· peturingi opened on Apr 2, 2026

Emit errors with --disallow-any-generics if type[T] or TypeForm[T] receives a generic T with missing type arguments

feature

Status: Open.

#21145 In python/mypy;

· bzoracler opened on Apr 2, 2026