fix Narrowing lost after excluding the only None case #3374#4114
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asukaminato0721 wants to merge 1 commit into
Open
fix Narrowing lost after excluding the only None case #3374#4114asukaminato0721 wants to merge 1 commit into
asukaminato0721 wants to merge 1 commit into
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Summary
Fixes #3374
Tracks when a terminating guard excludes both optional values being None.
Applies the implied narrowing when either value is subsequently proven None.
Invalidates the relationship on reassignment and preserves it only across valid flow merges.
Test Plan
add test