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On Windows, this caused the interactive window to just 
disappear.so I suspect something similar occurred.

New is a known dangerous, use at your own risk, implementation 
specific module whose use, like byte code hacking, is outside 
the language proper.  Both bypass normal object creation syntax 
and its checks and both can create invalid objects.  A hold-your-
hand inplementation would not give such access to internals.

Lib Ref 3.28 says "This module provides a low-level interface to 
the interpreter, so care must be exercised when using this 
module. It is possible to supply non-sensical arguments which 
crash the interpreter when the object is used."  Should more or 
different be said?  

If not, I suspect this should be closed as 'won't fix', as in 'won't 
remove the inherently dangerous new module'.