Interpreter error results in erroneous exception when running a script
under debugger control.

Full repro description:
On Windows System, try to run idle.py under the inspection of pdb.py. 
Note that you must set a breakpoint somewhere otherwise pdb will not
trace the script and the issue will not surface.

You should get the bad exception in line 295 of multicall.py

Python complains that a local variable has been used before being
declared while in effect it has been a couple of lines before that point.

Nir