it fails on py 2.7 (with a bug), fails correctly in py 3.3 and
succeeds in pypy 2.2:

>>>> import os
>>>> os.open("/", os.O_RDONLY)
3
>>>> os.fdopen(3, "r")
<open file '<fdopen>', mode 'r' at 0x0000000105b71830>
>>>> f = _
>>>> f.read(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 21] Is a directory: '<fdopen>'
>>>>
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