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Up to Python3.2, a nested ImportError was correctly displayed:
./python -c "import distutils.msvc9compiler"
Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File "/home/amauryfa/python/cpython3.2/Lib/distutils/msvc9compiler.py", line 27, in <module>
 import winreg
ImportError: No module named winreg
But with 3.3, the traceback is lost:
~/python/cpython3.x$ ./python -c "from distutils import msvc9compiler"
Traceback (most recent call last):
 File "<string>", line 1, in <module>
ImportError: cannot import name msvc9compiler
Even though the failure is still on the "import winreg" line. Only ImportError seems affected, other exceptions are correctly displayed.