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With Python 2.7 on Windows the following crashes with an assertion:
 >>> import os
 [43042 refs]
 >>> f = open("foobar", "wb")
 [43048 refs]
 >>> os.close(f.fileno())
 [43048 refs]
 >>> f.close()
 <Failed assertion>
A box pops up with
 Program: C:\Repos\cpython-27\PCbuild\python_d.exe
 File: f:\dd\vctools\crt_bld\self_x86\crt\src\close.c
 Line: 48
 Expression: (_osfile(fh) & FOPEN)
Python 3.2 and 3.3 give IOError(EBADF, ...) as expected.
Compare #15261 and #15263.