[just testing mypy-primer] union return types

[not-my-profile]

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[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

xarray (https://github.com/pydata/xarray)
+ ./xarray/core/utils.py:664: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ ./xarray/core/utils.py:664: : note: use --pdb to drop into pdb
- xarray/core/dataset.py:7818: error: Incompatible types in assignment (expression has type "Mapping[Hashable, int]", variable has type "Tuple[str]")  [assignment]
- xarray/core/dataset.py:7820: error: Incompatible types in assignment (expression has type "Union[Hashable, Iterable[Hashable], Any]", variable has type "Tuple[str]")  [assignment]
- xarray/core/dataset.py:7822: error: Argument 1 to "set" has incompatible type "Mapping[Hashable, int]"; expected "Iterable[Optional[str]]"  [arg-type]
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

jax (https://github.com/google/jax)
+ jax/_src/profiler.py:261: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ jax/_src/profiler.py:261: : note: use --pdb to drop into pdb
- jax/_src/numpy/ndarray.py:295: error: Cannot determine type of "_SDA_BASE_CLASS"  [has-type]
- jax/interpreters/xla.py:100: error: Need type annotation for "tracebacks" (hint: "tracebacks: Dict[<type>, <type>] = ...")  [var-annotated]
- jax/interpreters/partial_eval.py:1632: error: Argument 3 to "DebugInfo" has incompatible type "Callable[[List[int]], str]"; expected "Callable[[int], str]"  [arg-type]
- jax/_src/nn/functions.py:374: error: Argument 1 to "index" has incompatible type "Union[int, Hashable]"; expected "SupportsIndex"  [arg-type]
- jax/experimental/host_callback.py:967: error: Variable "jax.experimental.host_callback.XlaOp" is not valid as a type  [valid-type]
- jax/experimental/host_callback.py:967: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- jax/experimental/host_callback.py:1764: error: Variable "jax.experimental.host_callback.XlaLocalClient" is not valid as a type  [valid-type]
- jax/experimental/host_callback.py:1764: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- jax/experimental/host_callback.py:1765: error: Variable "jax.experimental.host_callback.XlaDevice" is not valid as a type  [valid-type]
- jax/experimental/host_callback.py:1765: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- jax/experimental/jax2tf/shape_poly.py:819: error: Argument 1 to "int" has incompatible type "Optional[int]"; expected "Union[str, bytes, SupportsInt, SupportsIndex, SupportsTrunc]"  [arg-type]
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

pytest (https://github.com/pytest-dev/pytest)
+ src/_pytest/helpconfig.py:107: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ src/_pytest/helpconfig.py:107: : note: use --pdb to drop into pdb
+ src/_pytest/config/__init__.py:388: error: Incompatible types in assignment (expression has type "Union[BinaryIO, TextIO]", variable has type "IO[str]")  [assignment]
- testing/test_assertion.py:993: error: No overload variant matches argument type "bool"  [call-overload]
- testing/test_assertion.py:993: note: Possible overload variants:
- testing/test_assertion.py:993: note:     def [_C <: type] attrs(maybe_cls: _C, these: Optional[Dict[str, Any]] = ..., repr_ns: Optional[str] = ..., repr: bool = ..., cmp: Optional[bool] = ..., hash: Optional[bool] = ..., init: bool = ..., slots: bool = ..., frozen: bool = ..., weakref_slot: bool = ..., str: bool = ..., auto_attribs: bool = ..., kw_only: bool = ..., cache_hash: bool = ..., auto_exc: bool = ..., eq: Optional[bool] = ..., order: Optional[bool] = ...) -> _C
- testing/test_assertion.py:993: note:     def attrs(maybe_cls: None = ..., these: Optional[Dict[str, Any]] = ..., repr_ns: Optional[str] = ..., repr: bool = ..., cmp: Optional[bool] = ..., hash: Optional[bool] = ..., init: bool = ..., slots: bool = ..., frozen: bool = ..., weakref_slot: bool = ..., str: bool = ..., auto_attribs: bool = ..., kw_only: bool = ..., cache_hash: bool = ..., auto_exc: bool = ..., eq: Optional[bool] = ..., order: Optional[bool] = ...) -> Callable[[_C], _C]
- testing/test_assertion.py:1009: error: Module has no attribute "define"  [attr-defined]
- testing/test_assertion.py:1016: error: Too many arguments for "SimpleDataObject"  [call-arg]
- testing/test_assertion.py:1017: error: Too many arguments for "SimpleDataObject"  [call-arg]
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

flake8 (https://github.com/pycqa/flake8)
+ src/flake8/formatting/base.py:85: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ src/flake8/formatting/base.py:85: : note: use --pdb to drop into pdb
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

zulip (https://github.com/zulip/zulip)
- Warning: unused section(s) in pyproject.toml: module = ['coverage.*', 'natsort.*', 'netifaces.*', 'pyinotify.*']
+ zproject/email_backends.py:31: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ zproject/email_backends.py:31: : note: use --pdb to drop into pdb
- zerver/lib/queue.py:218: error: Unused "type: ignore" comment
- zerver/lib/queue.py:234: error: Unused "type: ignore" comment
- zerver/lib/upload.py:162: error: Unused "type: ignore" comment
- zerver/lib/send_email.py:298: error: Unused "type: ignore" comment
- zerver/views/video_calls.py:246: error: Unused "type: ignore" comment
- corporate/tests/test_stripe.py:194: error: Unused "type: ignore" comment
- corporate/tests/test_stripe.py:2709: error: Unused "type: ignore" comment
- corporate/tests/test_stripe.py:2710: error: Unused "type: ignore" comment
- zproject/jinja2/__init__.py:33: error: Unused "type: ignore" comment
- zerver/tests/test_outgoing_http.py:28: error: Unused "type: ignore" comment
- zerver/tests/test_outgoing_http.py:44: error: Unused "type: ignore" comment
- zerver/tests/test_middleware.py:74: error: <nothing> has no attribute "get"  [attr-defined]
- zerver/tests/test_middleware.py:79: error: <nothing> has no attribute "get"  [attr-defined]
- zerver/tests/test_middleware.py:203: error: <nothing> has no attribute "get"  [attr-defined]
- zerver/tests/test_middleware.py:220: error: <nothing> has no attribute "get"  [attr-defined]
- zerver/tests/test_middleware.py:230: error: <nothing> has no attribute "get"  [attr-defined]
- tools/lib/provision_inner.py:27: error: Unused "type: ignore" comment
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

urllib3 (https://github.com/urllib3/urllib3)
+ /tmp/mypy_primer/projects/_urllib3_venv/lib/python3.10/site-packages/_pytest/helpconfig.py:107: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
- test/tz_stub.py:10: error: Unused "type: ignore" comment
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

dulwich (https://github.com/dulwich/dulwich)
+ dulwich/ignore.py:246: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ dulwich/ignore.py:246: : note: use --pdb to drop into pdb
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

rich (https://github.com/willmcgugan/rich)
+ /tmp/mypy_primer/projects/rich/rich/markdown.py:603: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
- rich/live.py:172: error: Subclass of "TextIO" and "FileProxy" cannot exist: would have incompatible method signatures
- rich/live.py:175: error: Subclass of "TextIO" and "FileProxy" cannot exist: would have incompatible method signatures
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

vision (https://github.com/pytorch/vision)
+ torchvision/prototype/features/_encoded.py:27: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ torchvision/prototype/features/_encoded.py:27: : note: use --pdb to drop into pdb
- torchvision/prototype/transforms/_geometry.py:124: error: Unused "type: ignore" comment
- torchvision/prototype/transforms/_geometry.py:125: error: Unused "type: ignore" comment
- torchvision/prototype/transforms/_augment.py:66: error: Unused "type: ignore" comment
- torchvision/prototype/transforms/_augment.py:67: error: Unused "type: ignore" comment
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1597, in check_overload_call
+   File "mypy/checkexpr.py", line 1868, in union_overload_result
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

pandas (https://github.com/pandas-dev/pandas)
- pandas/core/computation/ops.py:583: error: Cannot call function of unknown type  [operator]
- pandas/core/indexes/base.py:4091: error: Argument 1 has incompatible type "Union[ExtensionArray, ndarray[Any, Any]]"; expected "Union[_SupportsDunderLE, _SupportsDunderGE, _SupportsDunderGT, _SupportsDunderLT]"  [arg-type]
- pandas/core/indexes/base.py:4091: error: Argument 2 has incompatible type "Union[ExtensionArray, ndarray[Any, Any]]"; expected "Union[_SupportsDunderLE, _SupportsDunderGE, _SupportsDunderGT, _SupportsDunderLT]"  [arg-type]
- pandas/io/parsers/base_parser.py:1038: error: Incompatible types in assignment (expression has type "defaultdict[str, Union[ExtensionDtype, str, dtype[Any], Type[object], Dict[Hashable, Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]]]]]", variable has type "Optional[Union[Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]], Dict[Hashable, Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]]]]]")  [assignment]
- pandas/io/parsers/base_parser.py:1039: error: Unused "type: ignore[arg-type, return-value]" comment
- pandas/io/parsers/base_parser.py:1060: error: Value of type "Optional[Union[Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]], Dict[Hashable, Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]]]]]" is not indexable  [index]
- pandas/io/parsers/base_parser.py:1067: error: Value of type "Optional[Union[Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]], Dict[Hashable, Union[ExtensionDtype, Union[str, dtype[Any], Type[str], Type[float], Type[int], Type[complex], Type[bool], Type[object]]]]]]" is not indexable  [index]
- pandas/core/generic.py:1482: error: Argument 1 to "inv" has incompatible type "Union[ExtensionArray, ndarray[Any, Any]]"; expected "_SupportsInversion[ndarray[Any, dtype[bool_]]]"  [arg-type]
- pandas/core/generic.py:1484: error: Argument 1 to "neg" has incompatible type "Union[ExtensionArray, ndarray[Any, Any]]"; expected "_SupportsNeg[ndarray[Any, dtype[Any]]]"  [arg-type]
- pandas/core/generic.py:1496: error: Argument 1 to "pos" has incompatible type "Union[ExtensionArray, ndarray[Any, Any]]"; expected "_SupportsPos[ndarray[Any, dtype[Any]]]"  [arg-type]
- pandas/io/formats/style.py:3848: error: Argument 2 to "ge" has incompatible type "Union[str, float, Period, Timedelta, Interval[Any], datetime64, timedelta64, datetime, Sequence[Any], ndarray[Any, Any], NDFrame]"; expected "Union[_SupportsDunderLE, _SupportsDunderGE, _SupportsDunderGT, _SupportsDunderLT]"  [arg-type]
- pandas/io/formats/style.py:3855: error: Argument 2 to "le" has incompatible type "Union[str, float, Period, Timedelta, Interval[Any], datetime64, timedelta64, datetime, Sequence[Any], ndarray[Any, Any], NDFrame]"; expected "Union[_SupportsDunderLE, _SupportsDunderGE, _SupportsDunderGT, _SupportsDunderLT]"  [arg-type]
+ /tmp/mypy_primer/projects/_pandas_venv/lib/python3.10/site-packages/_pytest/helpconfig.py:107: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

poetry (https://github.com/python-poetry/poetry)
+ /tmp/mypy_primer/projects/_poetry_venv/lib/python3.10/site-packages/pip/_vendor/certifi/core.py:64: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

freqtrade (https://github.com/freqtrade/freqtrade)
- freqtrade/data/history/jsondatahandler.py:26: error: Signature of "ohlcv_get_available_data" incompatible with supertype "IDataHandler"
- freqtrade/data/history/jsondatahandler.py:38: error: Signature of "ohlcv_get_pairs" incompatible with supertype "IDataHandler"
- freqtrade/data/history/jsondatahandler.py:126: error: Signature of "trades_get_pairs" incompatible with supertype "IDataHandler"
- freqtrade/data/history/hdf5datahandler.py:24: error: Signature of "ohlcv_get_available_data" incompatible with supertype "IDataHandler"
- freqtrade/data/history/hdf5datahandler.py:36: error: Signature of "ohlcv_get_pairs" incompatible with supertype "IDataHandler"
- freqtrade/data/history/hdf5datahandler.py:111: error: Signature of "trades_get_pairs" incompatible with supertype "IDataHandler"
+ freqtrade/misc.py:260: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ freqtrade/misc.py:260: : note: use --pdb to drop into pdb
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

sphinx (https://github.com/sphinx-doc/sphinx)
- sphinx/locale/__init__.py: note: In member "__radd__" of class "_TranslationProxy":
- sphinx/locale/__init__.py:70:5: error: Argument 1 of "__radd__" is incompatible with supertype "UserString"; supertype defines the argument type as "object"
- sphinx/locale/__init__.py:70:5: note: This violates the Liskov substitution principle
- sphinx/locale/__init__.py:70:5: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
- sphinx/locale/__init__.py:70:5: error: Return type "str" of "__radd__" incompatible with return type "_TranslationProxy" in supertype "UserString"
- sphinx/locale/__init__.py: note: In member "__rmod__" of class "_TranslationProxy":
- sphinx/locale/__init__.py:76:5: error: Return type "str" of "__rmod__" incompatible with return type "_TranslationProxy" in supertype "UserString"
- sphinx/locale/__init__.py: note: In member "__rmul__" of class "_TranslationProxy":
- sphinx/locale/__init__.py:82:5: error: Return type "str" of "__rmul__" incompatible with return type "_TranslationProxy" in supertype "UserString"
- sphinx/domains/python.py:1477: error: Unused "type: ignore" comment
+ sphinx/testing/path.py:157: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ sphinx/testing/path.py:157: : note: use --pdb to drop into pdb
+ Traceback (most recent call last):
+   File "mypy/checkexpr.py", line 3962, in accept
+   File "mypy/nodes.py", line 1713, in accept
+   File "mypy/checkexpr.py", line 288, in visit_call_expr
+   File "mypy/checkexpr.py", line 371, in visit_call_expr_inner
+   File "mypy/checkexpr.py", line 878, in check_call_expr_with_callee_type
+   File "mypy/checkexpr.py", line 942, in check_call
+   File "mypy/checkexpr.py", line 1620, in check_overload_call
+   File "mypy/checkexpr.py", line 1762, in infer_overload_return_type
+   File "mypy/checkexpr.py", line 938, in check_call
+   File "mypy/checkexpr.py", line 1068, in check_callable_call
+   File "mypy/checkexpr.py", line 749, in apply_function_plugin
+   File "mypy/plugins/default.py", line 134, in open_callback
+   File "mypy/plugins/default.py", line 176, in _analyze_open_signature
+ AssertionError: 

cwltool (https://github.com/common-workflow-language/cwltool)
- Warning: unused section(s) in mypy.ini: [mypy-schema_salad.tests.*], [mypy-past.builtins.*]
+ cwltool/run_job.py:59: error: INTERNAL ERROR -- Please try using mypy master on Github:
+ https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
+ Please report a bug at https://github.com/python/mypy/issues
+ version: 0.931
+ cwltool/run_job.py:59: : note: use --pdb to drop into pdb
- cwltool/update.py: note: In function "v1_0to1_1":
- cwltool/update.py:92:13: error: Returning Any from function declared to return "Union[MutableSequence[MutableMapping[str, str]], MutableMapping[str, str]]"  [no-any-return]
- cwltool/update.py:94:13: error: Returning Any from function declared to return "Union[MutableSequence[MutableMapping[str, str]], MutableMapping[str, str]]"  [no-any-return]
- cwltool/update.py:100:13: error: Returning Any from function declared to return "Union[MutableSequence[MutableMapping[str, str]], MutableMapping[str, str]]"  [no-any-return]
- cwltool/update.py:102:13: error: Returning Any from function declared to return "Union[MutableSequence[MutableMapping[str, str]], MutableMapping[str, str]]"  [no-any-return]
- cwltool/process.py:646: error: Unused "type: ignore" comment
- cwltool/command_line_tool.py: note: In member "collect_output" of class "CommandLineTool":
- cwltool/command_line_tool.py:1381:37: error: Redundant cast to "Callable[[str, str], int]"  [redundant-cast]
- tests/test_pathmapper.py:67:2: error: Untyped decorator makes function "test_normalizeFilesDirs" untyped  [misc]
- tests/test_pathmapper.py:85:2: error: Untyped decorator makes function "test_basename_field_generation" untyped  [misc]
- tests/test_anon_types.py:115:2: error: Untyped decorator makes function "test_anon_types" untyped  [misc]
- cwltool/pack.py: note: In function "pack":
- cwltool/pack.py:323:5: error: Returning Any from function declared to return "MutableMapping[str, Union[bool, str, int, float, MutableSequence[Union[None, bool, str, int, float, MutableSequence[Union[None, bool, str, int, float, MutableSequence[Any], MutableMapping[str, Any]]], MutableMapping[str, Union[None, bool, str, int, float, MutableSequence[Any], MutableMapping[str, Any]]]]], MutableMapping[str, Union[None, bool, str, int, float, MutableSequence[Union[None, bool, str, int, float, MutableSequence[Any], MutableMapping[str, Any]]], MutableMapping[str, Union[None, bool, str, int, float, MutableSequence[Any], MutableMapping[str, Any]]]]], None]]"  [no-any-return]
- cwltool/main.py: note: In function "generate_input_template":
- cwltool/main.py:337:5: error: Returning Any from function declared to return "MutableMapping[str, Union[bool, str, int, float, MutableSequence[Union[None, bool, str, int, float, MutableSequence[Union[None, bool, str, int, float, MutableSequence[Any], MutableMapping[str, Any]]], MutableMapping[str, Un```

[JelleZijlstra]

I think mypy 0.931 still has a custom plugin for open(), so the typeshed signature doesn't actually affect it. But the new mypy release should drop that plugin. I don't know why your changes makes the plugin crash, though.