Error handling for recursive TypeVar defaults (PEP 696)#16925
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JelleZijlstra merged 3 commits intopython:masterfrom Feb 20, 2024
Merged
Error handling for recursive TypeVar defaults (PEP 696)#16925JelleZijlstra merged 3 commits intopython:masterfrom
JelleZijlstra merged 3 commits intopython:masterfrom
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Seems like psycopg found the NotImplementedError for you... It's a TypeAlias generic over a TypeVar with both a bound and a default: |
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Yeah. It's really helpful to get that feedback immediately. Anyway, it was a simple fix. The TypeAliasType is already evaluated earlier, so there is no need to travers it. Just returning the type unchanged is enough. |
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Thanks! Noticed a typo; I'll fix that and merge.
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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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This PR adds some additional error handling for recursive TypeVar defaults. Open issue for future PRs: - Expanding nested recursive defaults, e.g. `T2 = list[T1 = str]` - Scope binding, especially for TypeAliasTypes Ref: python#14851
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This PR adds some additional error handling for recursive TypeVar defaults.
Open issue for future PRs:
T2 = list[T1 = str]Figure out ifvisit_type_alias_typefor theTypeVarDefaultTranslatorvisitor is actually needed. The base class does not provide a default implementation. So far I haven't hit theNotImplementedError.Ref: #14851