[issue15425] Another strange Tracebacks with importlib

[Nick Coghlan]

Nick Coghlan added the comment:

I think the implementation I just checked in is close to being as simple as we can get:

Blocks ending in _exec_module and _recursive_import are trimmed unconditionally
For SyntaxError, it also trims blocks ending in get_code
For ImportError, it trims everything involving importlib

Because the latter two are conditional on the kind of exception thrown, it's only the first two that could be unified and I think keeping the two distinct checks is actually clearer in that case.

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<http://bugs.python.org/issue15425>
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