Handle scoping correctly for class fields in body #1024
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Fixes #264.
This diff addresses the scoping issues of class fields in nested scopes.
When a class field is defined in a class body, the scope of the field should only be available in the immediate class block, unless for annotations. This is described in the Python doc at https://docs.python.org/3/reference/executionmodel.html#resolution-of-names
To address this issue, we check the flow style when looking up a variable. If the variable is defined as a class field, we apply appropriate checks to avoid the incorrect scoping rule from being applied.