OK, if there is another argument besides self then the method is not
renamed; but calls to the method that *look* like the iterator's `next()`
method get re-written with the next function...and since that isn't defined
then failures occur:
File "...py3k-sympy\sympy\combinatorics\prufer.py", line 284,
in sympy.combinatorics.prufer.Prufer.next
Failed example:
b = next(a)
Exception raised:
Traceback (most recent call last):
File "C:\Python32\lib\doctest.py", line 1253, in __run
compileflags, 1), test.globs)
File "<doctest sympy.combinatorics.prufer.Prufer.next[2]>", line 1,
in <mo
dule>
b = next(a)
TypeError: Prufer object is not an iterator
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