Fix crash on overriding with frozen attrs #14186
Merged
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Fixes #6715
Fix is straightforward, currently we assume that if we have a variable in MRO, and its name appears in current class, it is from this class, which in fact may not be the case when a variable is overridden with a property or method.
I also add a test case for a crash that was previously reported in the same issue but is already (accidentally?) fixed.