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Produce mypyc errors when encountering bug #5423 - #7482
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Currently when we encounter #5423 (when someting is incorrectly inferred as None), we generate code that casts a variable to None incorrectly since we are confused about the real type. Now produce an error message saying to add an annotation when we detect it. Fix up the places in mypy this caused errors.
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ilevkivskyi
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LGTM. Also thanks for the clean-up!
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Currently when we encounter #5423 (when someting is incorrectly
inferred as None), we generate code that casts a variable to None
incorrectly since we are confused about the real type.
Now produce an error message saying to add an annotation when we
detect it.
Fix up the places in mypy this caused errors.