Reusable validators cause untyped field mypy error

[Dreamsorcerer]

Using the example for reusable validators, if the plugin's warn_untyped_fields is enabled, then I get this error when checking the example:

test.py:12: error: Untyped fields disallowed  [pydantic-field]
test.py:19: error: Untyped fields disallowed  [pydantic-field]

https://pydantic-docs.helpmanual.io/usage/validators/#reuse-validators

Expected behaviour:
There should be no errors. The attribute should be inferred as a validator and no error should be raised.