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PEP 800: Note that ty now supports @disjoint_base #4560

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Aug 25, 2025
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PEP 800: Note that ty now supports @disjoint_base #4560

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PEP 800: note that ty now supports `@disjoint_base`
AlexWaygood Aug 25, 2025
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Update peps/pep-0800.rst
AlexWaygood Aug 25, 2025
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6 changes: 4 additions & 2 deletions peps/pep-0800.rst
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Expand Up @@ -371,10 +371,12 @@ explain to users why type checkers treat certain branches as unreachable.
Reference Implementation
========================

The runtime implementation of the ``@disjoint_base`` decorator will be available in
typing-extensions 4.15.0.
The runtime implementation of the ``@disjoint_base`` decorator is available in
`typing-extensions 4.15.0 <https://pypi.org/project/typing-extensions/4.15.0/>`__.
`python/mypy#19678 <https://github.com/python/mypy/pull/19678>`__
implements support for disjoint bases in mypy and in the stubtest tool.
`astral-sh/ruff#20084 <https://github.com/astral-sh/ruff/pull/20084>`__
implements support for disjoint bases in the ty type checker.

Appendix
========
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