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Pyexpat.c calls the tracing function explicitly (not sure why). When it
intercepts an exception, it calls the function with PyTrace_EXCEPTION,
but then leaves the scope without calling PyTrace_RETURN. This is
incorrect. There should always be a PyTrace_RETURN for every PyTrace_CALL.
I've attached domshow.py to demonstrate the problem.
Running it produces many lines of output, including:
 line expatbuilder.py 222
 line expatbuilder.py 223
 call pyexpat.c 905
 call expatbuilder.py 892
 line expatbuilder.py 894
 line expatbuilder.py 900
 exception expatbuilder.py 900
 return expatbuilder.py 900
 exception pyexpat.c 905
 exception expatbuilder.py 223
 line expatbuilder.py 225
 line expatbuilder.py 226
The exception at line 905 in pyexpat.c should be followed with a return
from line 905 in pyexpat.c, but is not. After that exception, the
nesting is off by one because the Calls and Returns don't match.