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Issue 1782: Test case where pypy is more than 4x slower than CPython
https://bitbucket.org/pypy/pypy/issue/1782/test-case-where-pypy-is-more-than-4x

Armin Rigo:

Simplified test case: this runs in 1.1 seconds on CPython, 5.8 seconds on "PyPy 
--jit off", and seems never to finish on PyPy (out of ram after 2 minutes):

    def g(n):
        if n > 0:
            for x in g(n-1):
                yield x
            for x in g(n-1):
                yield x
        else:
            yield 0

    list(g(20))


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