Mypy is reporting incorrect line numbers on a 2.7kloc files.

[fjovell-swish]

Bug Report

Trying to typecheck the OCPP package, and when running mypy against v201/enums.py file, I get the following error:

$ mypy ocpp/v201/enums.py

Expected Behavior

Line numbers to be correctly displayed and errors to make sense in the context.

Actual Behavior

ocpp/v201/enums.py:1485: error: Incompatible types in assignment (expression has type "StandardizedVariableName", base class "str" defined the type as "Callable[[str, SupportsIndex | None, SupportsIndex | None], int]")  [assignment]
ocpp/v201/enums.py:2649: error: Incompatible types in assignment (expression has type "SpacesCountSignageVariableName", base class "str" defined the type as "Callable[[str, SupportsIndex | None, SupportsIndex | None], int]")  [assignment]
Found 2 errors in 1 file (checked 1 source file)

Your Environment

• Mypy version used: mypy 2.3.1 (compiled: yes)
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: python3.11
• OS: MacOS Tahoe 26.6.2

[fjovell-swish]

Word adding: I tried with a warm cache and without cache (by deleting the entire cache) and I got the same result.

[JelleZijlstra]

Is the version you linked exactly the same as what you're type checking? Line 1487 of https://github.com/mobilityhouse/ocpp/blob/b0e0b07fd77652a586b0b6aba1bac77b6683573a/ocpp/v201/enums.py#L1487 correctly has that error (the count enum member unsafely overrides the str.count method).