pyos added the comment: I don't think this is a bug. `b += iter(b)` and `for c in b: b.append(c)` work the same way. Also, the tutorial makes it clear that you should duplicate the list if you modify it inside a loop; in this case, this can be done either by iterating over `b[:]` instead of just `b` or using a list comprehension instead of a generator.
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