Steven D'Aprano added the comment:

I disagree that it "should not be the case", I think Python's current behaviour 
is correct. Although it makes debugging completer functions harder, it would 
not be good for a bug in the completer to raise an exception and break line 
editing. This is one case where errors should be silenced.

Instead, my completion functions log errors to a file, and I watch the log file 
in another terminal window.

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nosy: +steven.daprano

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<http://bugs.python.org/issue24442>
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