Fixed issue that results in a false positive "type could not be deter… #9323
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…mined because it refers to itself" error caused by a false dependency due to narrowing logic. This may also improve type analysis performance in some code. This addresses #9139.
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Diff from mypy_primer, showing the effect of this PR on open source code: sympy (https://github.com/sympy/sympy)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/algorithms.py:110:21 - error: Argument of type "Print" cannot be assigned to parameter "object" of type "Declaration" in function "append"
+ "Print" is not assignable to "Declaration" (reportArgumentType)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/ast.py:401:8 - error: Class definition for "NoneToken" depends on itself (reportGeneralTypeIssues)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/ast.py:1511:27 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:324:40 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:325:20 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:326:20 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:327:20 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:454:16 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:455:16 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:460:16 - error: Cannot access attribute "decimal_dig" for class "Token*"
- Attribute "decimal_dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:461:16 - error: Cannot access attribute "decimal_dig" for class "Token*"
- Attribute "decimal_dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:466:16 - error: Cannot access attribute "max_exponent" for class "Token*"
- Attribute "max_exponent" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:467:16 - error: Cannot access attribute "max_exponent" for class "Token*"
- Attribute "max_exponent" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:472:16 - error: Cannot access attribute "min_exponent" for class "Token*"
- Attribute "min_exponent" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:473:16 - error: Cannot access attribute "min_exponent" for class "Token*"
- Attribute "min_exponent" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:478:78 - error: Operator "-" not supported for type "type[__class_UndefinedFunction] | Literal[6]" (reportOperatorIssue)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:479:87 - error: Operator "-" not supported for type "type[__class_UndefinedFunction] | Literal[15]" (reportOperatorIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:478:20 - error: Cannot access attribute "eps" for class "Token*"
- Attribute "eps" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:478:83 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:479:20 - error: Cannot access attribute "eps" for class "Token*"
- Attribute "eps" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:479:92 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:484:79 - error: Operator "-" not supported for type "type[__class_UndefinedFunction] | Literal[6]" (reportOperatorIssue)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:485:89 - error: Operator "-" not supported for type "type[__class_UndefinedFunction] | Literal[15]" (reportOperatorIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:484:20 - error: Cannot access attribute "max" for class "Token*"
- Attribute "max" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:484:84 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:485:20 - error: Cannot access attribute "max" for class "Token*"
- Attribute "max" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:485:94 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:491:80 - error: Operator "-" not supported for type "type[__class_UndefinedFunction] | Literal[6]" (reportOperatorIssue)
+ /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:492:90 - error: Operator "-" not supported for type "type[__class_UndefinedFunction] | Literal[15]" (reportOperatorIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:491:20 - error: Cannot access attribute "tiny" for class "Token*"
- Attribute "tiny" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:491:85 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:492:20 - error: Cannot access attribute "tiny" for class "Token*"
- Attribute "tiny" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:492:95 - error: Cannot access attribute "dig" for class "Token*"
- Attribute "dig" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:496:16 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:497:20 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:498:27 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:500:16 - error: Cannot access attribute "cast_nocheck" for class "Token*"
- Attribute "cast_nocheck" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:501:16 - error: Cannot access attribute "cast_nocheck" for class "Token*"
- Attribute "cast_nocheck" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:502:16 - error: Cannot access attribute "cast_nocheck" for class "Token*"
- Attribute "cast_nocheck" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:503:16 - error: Cannot access attribute "cast_nocheck" for class "Token*"
- Attribute "cast_nocheck" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:504:27 - error: Cannot access attribute "cast_nocheck" for class "Token*"
- Attribute "cast_nocheck" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:511:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:512:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:513:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:514:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:515:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:516:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:519:28 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
- /tmp/mypy_primer/projects/sympy/sympy/codegen/tests/test_ast.py:525:36 - error: Cannot access attribute "cast_check" for class "Token*"
- Attribute "cast_check" is unknown (reportAttributeAccessIssue)
... (truncated 23 lines) ...
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…mined because it refers to itself" error caused by a false dependency due to narrowing logic. This may also improve type analysis performance in some code. This addresses #9139.