Issues

• Disallow plain Concatenate[...] as type hint

  bugtopic-paramspec
  python/mypy#21425 · Filter by author A5rocks opened on May 7, 2026

• Assertion failure crash: assert not any(isinstance(t, Parameters) for t in arg_types)

  crashtopic-paramspec
  python/mypy#21404 · Filter by author correctmost opened on May 3, 2026

• ParamSpec inferred overly wide from protocol

  bugtopic-inferencetopic-paramspec
  python/mypy#21384 · Filter by author iglosiggio opened on Apr 30, 2026
  2

• Overlapping overloads false positive with ParamSpec shenanigans

  bugtopic-overloadstopic-paramspec
  python/mypy#21171 · Filter by author jonathandung opened on Apr 5, 2026

• RecursionError with recursive type alias and concatenate

  crashtopic-paramspectopic-recursive-types
  python/mypy#21123 · Filter by author MeGaGiGaGon opened on Apr 1, 2026
  2

• Move error messages for keyword arguments with ParamSpec

  featuretopic-paramspec
  python/mypy#21001 · Filter by author A5rocks opened on Mar 10, 2026

• Bad interaction between ParamSpec and TypeVarTuple

  bugtopic-paramspectopic-pep-646
  python/mypy#19855 · Filter by author randolf-scholz opened on Sep 15, 2025

• mypy doesn't understand that *args: P.args implies that args is a tuple

  bugtopic-callstopic-paramspec
  python/mypy#19663 · Filter by author randolf-scholz opened on Aug 15, 2025
  1

• NamedTuple parametrized with a ParamSpec can't be used as an annotation

  bugtopic-named-tupletopic-paramspec
  python/mypy#19658 · Filter by author sbrudenell opened on Aug 14, 2025
  1

• ParamSpec seems to get lost with partial()

  bugtopic-paramspectopic-runtime-semantics
  python/mypy#18589 · Filter by author Dreamsorcerer opened on Feb 2, 2025
  3

• mypy failed to return correct overloaded func type when decorate func accepts more than one parameter

  bugtopic-overloadstopic-paramspec
  python/mypy#18167 · Filter by author uriyyo opened on Nov 19, 2024
  2

• Incompatible ParamSpecs are not reported as issue

  bugtopic-paramspectopic-type-variables
  python/mypy#17766 · Filter by author pfaion opened on Sep 13, 2024
  1

• Case of generic decorators not working on generic callables (ParamSpec)

  bugtopic-paramspec
  python/mypy#17621 · Filter by author kcdodd opened on Aug 1, 2024
  2

• using a decorator on an overloaded function where the decorator uses Concatenate causes false positive "Overloaded function implementation does not accept all possible arguments" error

  bugtopic-paramspec
  python/mypy#17459 · Filter by author DetachHead opened on Jul 1, 2024
  3

• Allow self binding for generic ParamSpec

  topic-paramspec
  Unread
  python/mypy#17123·cdce8p opened Apr 14, 2024 · Updated Oct 8, 2024
  4

• --extra-checks is too strict when using Concatenate within a Protocol

  bugtopic-paramspec
  python/mypy#17122 · Filter by author Daverball opened on Apr 14, 2024
  1

• Support TypedDict unpacking in ParamSpec specifications

  featuretopic-paramspectopic-typed-dict
  python/mypy#16120 · Filter by author tmke8 opened on Sep 15, 2023

• More principled solution for universal quantificatoin of non-Callable types

  featurepriority-2-lowtopic-paramspectopic-type-variables
  python/mypy#15909 · Filter by author ilevkivskyi opened on Aug 18, 2023

• wrongly inferred type builtins.object

  bugtopic-join-v-uniontopic-paramspec
  python/mypy#15295 · Filter by author robsdedude opened on May 24, 2023
  1

• ParamSpecs upper bounds should be a Parameters object and not an actual object

  topic-paramspec
  Unread
  python/mypy#15252·A5rocks opened May 16, 2023 · Updated May 19, 2023
  2

• Incremental mode bug for nested ParamSpecs

  bugtopic-paramspectopic-self-types
  python/mypy#14322 · Filter by author ringohoffman opened on Dec 20, 2022
  2