Try to fix problems caused by in-place modification of typevar defaults#19382
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sterliakov wants to merge 3 commits intopython:masterfrom
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Try to fix problems caused by in-place modification of typevar defaults#19382sterliakov wants to merge 3 commits intopython:masterfrom
sterliakov wants to merge 3 commits intopython:masterfrom
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
ilevkivskyi
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Nov 20, 2025
…20139) Fixes #19185. Fixes #19186. Replaces #19382 (not closing that yet, need to extract another part related to `applytype` from there to another PR). When a `TypeVar` defaults to another `TypeVar`, that default should already be in scope. Fortunately we already analyze them in the correct order, so the active scope has all the necessary information. This fixes the namespace drift problem because the bound typevars are already adjusted to use the correct namespace, and we do not need to touch their global definitions. I am not super happy about making TypeVarLikeScope impure here - any suggestions? Would passing `self.msg` to every `bind_new` call look saner? --------- Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>
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Fixes #19186. Fixes #19185. Fixes #19192. Fixes behavior in #14851 (comment) (note that assert_type should fail with bare class, it is still generic until actually used unsubscripted).
I do not know yet whether these changes are actually valid. Let's check the primer output and run all tests first.