[issue20490] Show clear error message on circular import

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:


New changeset 2d5594fac21a81a06f82c3605318dfa96e72398f by Steve Dower in branch '3.8':
bpo-20490: Improve circular import error message (GH-15308)
https://github.com/python/cpython/commit/2d5594fac21a81a06f82c3605318dfa96e72398f


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