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Title: Typecheck unreachable code by A5rocks · Pull Request #18707 · python/mypy · GitHub

Open Graph Title: Typecheck unreachable code by A5rocks · Pull Request #18707 · python/mypy

X Title: Typecheck unreachable code by A5rocks · Pull Request #18707 · python/mypy

Description: Optional static typing for Python. Contribute to python/mypy development by creating an account on GitHub.

Open Graph Description: Fixes [regression] no type checking beyond perceived isinstance guard failure #18329 Maybe type narrowing leads to "unreachable" code being actually reachable #12598 Maybe <nothing>...

X Description: Fixes [regression] no type checking beyond perceived isinstance guard failure #18329 Maybe type narrowing leads to &quot;unreachable&quot; code being actually reachable #12598 Maybe &lt...

Opengraph URL: https://github.com/python/mypy/pull/18707

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Feb 19, 2025https://github.com/python/mypy/pull/18707#issue-2862782964
Please reload this pagehttps://github.com/python/mypy/pull/18707
[regression] no type checking beyond perceived isinstance guard failure #18329https://github.com/python/mypy/issues/18329
type narrowing leads to "unreachable" code being actually reachable #12598https://github.com/python/mypy/issues/12598
object is not iterable #4330https://github.com/python/mypy/issues/4330
"Cannot determine type" if first assignment to attribute is unreachable #9709https://github.com/python/mypy/issues/9709
assert_type fails to fail for NoReturn #16319https://github.com/python/mypy/issues/16319
Union of Never can't be used #18779https://github.com/python/mypy/issues/18779
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February 19, 2025 15:21https://github.com/python/mypy/pull/18707#commits-pushed-be1071e
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Start type checking unreachable codehttps://github.com/python/mypy/pull/18707/commits/be1071e454e5f012f8998e91a868e31c83efdad3
be1071ehttps://github.com/python/mypy/pull/18707/commits/be1071e454e5f012f8998e91a868e31c83efdad3
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Pass self-checkhttps://github.com/python/mypy/pull/18707/commits/d9969181b7c388b72aade987b82bf60242c620d7
d996918https://github.com/python/mypy/pull/18707/commits/d9969181b7c388b72aade987b82bf60242c620d7
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Hacky fix to narrow unreachable literalshttps://github.com/python/mypy/pull/18707/commits/07de5bfca7f26fe82a00f8d362de80556f7481a3
07de5bfhttps://github.com/python/mypy/pull/18707/commits/07de5bfca7f26fe82a00f8d362de80556f7481a3
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20% of testshttps://github.com/python/mypy/pull/18707/commits/bac268b531833508e008eff08fb0d90195c1835a
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25% of testshttps://github.com/python/mypy/pull/18707/commits/2da4b7c2eb46dc824ab6eed8fc221f3e021c5dc4
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30% of testshttps://github.com/python/mypy/pull/18707/commits/ba9dab2018678d8c1296da3f61badf733e5a5bee
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40% of testshttps://github.com/python/mypy/pull/18707/commits/7c39efa49687394fc8552dd018b896dc24d2ff77
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Narrow isinstance checks to Neverhttps://github.com/python/mypy/pull/18707/commits/e242b5e59367664b4ec656d863f2861c401af7fe
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Don't treat reveal_type() as a no-ophttps://github.com/python/mypy/pull/18707/commits/69efb41ad4b44e7d0c802a801355a1b5876ca641
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Ensure functions with typevar values don't get false positiveshttps://github.com/python/mypy/pull/18707/commits/f846af7b57694196ef15df3f24894b93dea3ec00
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Feb 24, 2025 https://github.com/python/mypy/pull/18707#ref-pullrequest-2811729737
Fix --warn-unreachable fall-through from ALWAYS_TRUE ifs #18539 https://github.com/python/mypy/pull/18539
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February 24, 2025 12:37https://github.com/python/mypy/pull/18707#commits-pushed-92a4428
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Only report unreachability oncehttps://github.com/python/mypy/pull/18707/commits/92a4428bf4f221810eefb7d197bbf4776aaf3908
92a4428https://github.com/python/mypy/pull/18707/commits/92a4428bf4f221810eefb7d197bbf4776aaf3908
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Narrow callable checks to Neverhttps://github.com/python/mypy/pull/18707/commits/c76d422e9a4ac2f29fd2c23ade0f0613f31178c4
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Narrow match captures to Neverhttps://github.com/python/mypy/pull/18707/commits/13ad1cb54c01ee320201883ae4fbb653c8ff36d7
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Don't check unreachable code with partial typeshttps://github.com/python/mypy/pull/18707/commits/53553e7af2520a26a4ffc0cf91aab032e9b12196
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Unpack Never iterableshttps://github.com/python/mypy/pull/18707/commits/4ddd34ea9061b1036b51596aa0a51d2abac88427
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390388ahttps://github.com/python/mypy/pull/18707/commits/390388a8d35446f927c7334c57b442530c8aeac6
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Mar 11, 2025 https://github.com/python/mypy/pull/18707#ref-issue-2907792166
Union of Never can't be used #18779 https://github.com/python/mypy/issues/18779
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Support Never callables in pluginshttps://github.com/python/mypy/pull/18707/commits/dc8ed710790802ded7fe9ca5f079747fd77da220
dc8ed71https://github.com/python/mypy/pull/18707/commits/dc8ed710790802ded7fe9ca5f079747fd77da220
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Add a test about narrowing behaviorhttps://github.com/python/mypy/pull/18707/commits/102ac11a7a12af415d0fbb14ce5628dcc6841427
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Merge remote-tracking branch 'upstream/master' into experiments/typec…https://github.com/python/mypy/pull/18707/commits/f7f8915fcbfa1401a3d3cd2fb2cad45bbfa92520
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Add an option to enable checking unreachable codehttps://github.com/python/mypy/pull/18707/commits/4f319bb2e0ef90762d7cf0f966f690780aa33740
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Union of Never can't be used https://github.com/python/mypy/issues/18779
[regression] no type checking beyond perceived isinstance guard failure https://github.com/python/mypy/issues/18329
assert_type fails to fail for NoReturn https://github.com/python/mypy/issues/16319
"Cannot determine type" if first assignment to attribute is unreachable https://github.com/python/mypy/issues/9709
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