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Title: Draft: Solve intermediate variable bug by randolf-scholz · Pull Request #19399 · python/mypy · GitHub

Open Graph Title: Draft: Solve intermediate variable bug by randolf-scholz · Pull Request #19399 · python/mypy

X Title: Draft: Solve intermediate variable bug by randolf-scholz · Pull Request #19399 · python/mypy

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

Open Graph Description: Fixes: Assigning to intermediate variable changes type checking results #19304 Fixes: Unexpected "incompatible type" error when chaining bytes(filter()) #12247 Fixes: Unsupported operand ...

X Description: Fixes: Assigning to intermediate variable changes type checking results #19304 Fixes: Unexpected "incompatible type" error when chaining bytes(filter()) #12247 Fixes: Unsupported ...

Opengraph URL: https://github.com/python/mypy/pull/19399

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og:image:altFixes: Assigning to intermediate variable changes type checking results #19304 Fixes: Unexpected "incompatible type" error when chaining bytes(filter()) #12247 Fixes: Unsupported operand ...
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Assigning to intermediate variable changes type checking results #19304https://github.com/python/mypy/issues/19304
Unexpected "incompatible type" error when chaining bytes(filter()) #12247https://github.com/python/mypy/issues/12247
Unsupported operand types for + ("list[None]" and "list[str]") #19413https://github.com/python/mypy/issues/19413
Spurious error when adding two list #15087https://github.com/python/mypy/issues/15087
Mypy is still too eager about outer context #5874https://github.com/python/mypy/issues/5874
Covariant generic type context results in confusing message with __add__ #5971https://github.com/python/mypy/issues/5971
Unsupported operand types for + (List[A] and List[B]) when B extends A #3933https://github.com/python/mypy/issues/3933
Generic matching error when tuple-unpacking result #16310https://github.com/python/mypy/issues/16310
attribute failure when unpacking from tuple and wait_for #15569https://github.com/python/mypy/issues/15569
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[CI]: mypy-primer(0) timeout due to long checking of colour #19403 https://github.com/python/mypy/issues/19403
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1 check remaininghttps://github.com/python/mypy/pull/19399/commits/43eaa3f5f3906cb9816aa15f8190d59cb566e7e9
43eaa3fhttps://github.com/python/mypy/pull/19399/commits/43eaa3f5f3906cb9816aa15f8190d59cb566e7e9
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checks passhttps://github.com/python/mypy/pull/19399/commits/cfba9a1a69f3fba4a6ad9b12b83bc241cb27aece
cfba9a1https://github.com/python/mypy/pull/19399/commits/cfba9a1a69f3fba4a6ad9b12b83bc241cb27aece
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some simplificationshttps://github.com/python/mypy/pull/19399/commits/c7f73a832ed5139c8c5142a197125457f88a7d58
c7f73a8https://github.com/python/mypy/pull/19399/commits/c7f73a832ed5139c8c5142a197125457f88a7d58
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revert fixture modificationhttps://github.com/python/mypy/pull/19399/commits/fc42098fd1aa5b2bc7deeb7f3501f94688dc7496
fc42098https://github.com/python/mypy/pull/19399/commits/fc42098fd1aa5b2bc7deeb7f3501f94688dc7496
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simplifyhttps://github.com/python/mypy/pull/19399/commits/a4644080869523ed6c67b8477fed12dcfac7b5ca
a464408https://github.com/python/mypy/pull/19399/commits/a4644080869523ed6c67b8477fed12dcfac7b5ca
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Simplified away early inner_solution computationhttps://github.com/python/mypy/pull/19399/commits/af7a9628134a9dc81a599e61da8de64ed6ae0bd0
af7a962https://github.com/python/mypy/pull/19399/commits/af7a9628134a9dc81a599e61da8de64ed6ae0bd0
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added testLiteralMappingContexthttps://github.com/python/mypy/pull/19399/commits/869a980e3ba4a225325c185cebdfd6efed2cd513
869a980https://github.com/python/mypy/pull/19399/commits/869a980e3ba4a225325c185cebdfd6efed2cd513
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replace one hack with anotherhttps://github.com/python/mypy/pull/19399/commits/20de89fb1d0382806be9f733826e39a3ed4d3765
20de89fhttps://github.com/python/mypy/pull/19399/commits/20de89fb1d0382806be9f733826e39a3ed4d3765
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fixed use get_proper_type before isinstance checkhttps://github.com/python/mypy/pull/19399/commits/9ae652e2915daefa9835c6187cc4b7ad87500f3b
9ae652ehttps://github.com/python/mypy/pull/19399/commits/9ae652e2915daefa9835c6187cc4b7ad87500f3b
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added testContextFreeConcatInvariantType and testInContextConcatInvar…https://github.com/python/mypy/pull/19399/commits/24d8c7b9309c71f8c63178248012b775ea289c1a
24d8c7bhttps://github.com/python/mypy/pull/19399/commits/24d8c7b9309c71f8c63178248012b775ea289c1a
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Added test "testTypedDictWideContext".https://github.com/python/mypy/pull/19399/commits/66f6e7bade5fed56e9bfcebfb8286b538a8bdc08
66f6e7bhttps://github.com/python/mypy/pull/19399/commits/66f6e7bade5fed56e9bfcebfb8286b538a8bdc08
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updated testBinaryOperatorContexthttps://github.com/python/mypy/pull/19399/commits/1db896c57f58005bc60a162fb3a66a6f0f6c890d
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rebased masterhttps://github.com/python/mypy/pull/19399/commits/451e5cda91ddea06bdee6c446745d4b0db886421
451e5cdhttps://github.com/python/mypy/pull/19399/commits/451e5cda91ddea06bdee6c446745d4b0db886421
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ignore joint when no inner constraintshttps://github.com/python/mypy/pull/19399/commits/2e62e5fcf9c63d69213545fdb13a9633350aa667
2e62e5fhttps://github.com/python/mypy/pull/19399/commits/2e62e5fcf9c63d69213545fdb13a9633350aa667
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fix TypedDict with wide context bughttps://github.com/python/mypy/pull/19399/commits/ba9aa636724efc2d695e941d607aaa19d00bda53
ba9aa63https://github.com/python/mypy/pull/19399/commits/ba9aa636724efc2d695e941d607aaa19d00bda53
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3e40ab7https://github.com/python/mypy/commit/3e40ab74db96b480fba4eda5079c55240f97c983
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July 24, 2025 14:09https://github.com/python/mypy/pull/19399#event-18796270439
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meet_types gives unexpected results when meeting literal and Instance #19560 https://github.com/python/mypy/issues/19560
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Jan 16, 2026 https://github.com/python/mypy/pull/19399#ref-issue-3809565816
Misleading error message with dict.get like method. (polymorphic function with conflicting context) #20576 https://github.com/python/mypy/issues/20576
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Spurious error when adding two list https://github.com/python/mypy/issues/15087
Unexpected "incompatible type" error when chaining bytes(filter()) https://github.com/python/mypy/issues/12247
Covariant generic type context results in confusing message with __add__ https://github.com/python/mypy/issues/5971
Mypy is still too eager about outer context https://github.com/python/mypy/issues/5874
Unsupported operand types for + (List[A] and List[B]) when B extends A https://github.com/python/mypy/issues/3933
attribute failure when unpacking from tuple and wait_for https://github.com/python/mypy/issues/15569
Generic matching error when tuple-unpacking result https://github.com/python/mypy/issues/16310
Assigning to intermediate variable changes type checking results https://github.com/python/mypy/issues/19304
Unsupported operand types for + ("list[None]" and "list[str]") https://github.com/python/mypy/issues/19413
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