Comment #4 on issue 2562 by asmeurer: Test failure in generate_derangements() with Python2.5
http://code.google.com/p/sympy/issues/detail?id=2562
Oops, I didn't notice that this was a test failure issue. Yes, obviously this should be fixed before releasing.
Apparently, itertools is written in C, so we cannot just copy the source. Can we write a quick function to emulate it? Otherwise, I guess you are right about reverting it.
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