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The original bug report gives an example where the code to
debug was specified from python's shell. I am not quite  how
pdb is supposed to behave in this case.. With the patch, it
does seem to enter in the right frame, but it can't list the
code.

The patch does work when the code comes from a file.
 
.def foo():
     import pdb 
     pdb.set_trace()
     print "tracing 1"
     print "tracing 2"
 foo()