Fixed bug that results in incorrect type narrowing on assignment if t… #9154
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…he narrowed type is `Self` or another bound type variable. This addresses #9147.
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Diff from mypy_primer, showing the effect of this PR on open source code: pydantic (https://github.com/pydantic/pydantic)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:153:17 - error: Cannot assign to attribute "__pydantic_custom_init__" for class "ModelMetaclass*"
+ Attribute "__pydantic_custom_init__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:154:17 - error: Cannot assign to attribute "__pydantic_post_init__" for class "ModelMetaclass*"
+ Attribute "__pydantic_post_init__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:154:54 - error: Cannot access attribute "model_post_init" for class "ModelMetaclass*"
+ Attribute "model_post_init" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:156:17 - error: Cannot assign to attribute "__pydantic_decorators__" for class "ModelMetaclass*"
+ Attribute "__pydantic_decorators__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:160:21 - error: Cannot assign to attribute "__pydantic_generic_metadata__" for class "ModelMetaclass*"
+ Attribute "__pydantic_generic_metadata__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:201:21 - error: Cannot assign to attribute "__pydantic_generic_metadata__" for class "ModelMetaclass*"
+ Attribute "__pydantic_generic_metadata__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:207:17 - error: Cannot assign to attribute "__pydantic_complete__" for class "ModelMetaclass*"
+ Attribute "__pydantic_complete__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:215:21 - error: Cannot assign to attribute "__pydantic_parent_namespace__" for class "ModelMetaclass*"
+ Attribute "__pydantic_parent_namespace__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:237:17 - error: Cannot assign to attribute "__pydantic_computed_fields__" for class "ModelMetaclass*"
+ Attribute "__pydantic_computed_fields__" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/pydantic/pydantic/_internal/_model_construction.py:238:43 - error: Cannot access attribute "__pydantic_decorators__" for class "ModelMetaclass*"
+ Attribute "__pydantic_decorators__" is unknown (reportAttributeAccessIssue)
- 263 errors, 45 warnings, 0 informations
+ 273 errors, 45 warnings, 0 informations
pip (https://github.com/pypa/pip)
- /tmp/mypy_primer/projects/pip/src/pip/_vendor/packaging/specifiers.py
- /tmp/mypy_primer/projects/pip/src/pip/_vendor/packaging/specifiers.py:360:46 - error: Cannot access attribute "_canonical_spec" for class "object"
- Attribute "_canonical_spec" is unknown (reportAttributeAccessIssue)
- 1819 errors, 48 warnings, 0 informations
+ 1818 errors, 48 warnings, 0 informations
packaging (https://github.com/pypa/packaging)
- /tmp/mypy_primer/projects/packaging/src/packaging/specifiers.py
- /tmp/mypy_primer/projects/packaging/src/packaging/specifiers.py:360:46 - error: Cannot access attribute "_canonical_spec" for class "object"
- Attribute "_canonical_spec" is unknown (reportAttributeAccessIssue)
- 30 errors, 0 warnings, 0 informations
+ 29 errors, 0 warnings, 0 informations
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…he narrowed type is
Selfor another bound type variable. This addresses #9147.