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Based on fix_next.py by Collin Winter.

Replaces it.next() -> next(it), per PEP 3114.

Unlike fix_next.py, this fixer doesn't replace the name of a next method with __next__,
which would break Python 2 compatibility without further help from fixers in
stage 2.
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    power< base=any+ trailer< '.' attr='next' > trailer< '(' ')' > >
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