With attached test.zip and svn revision 67006,

$ ./python.exe test.zip 
> /Users/sasha/Work/python-svn/trunk/test.zip/__main__.py(2)f()
(Pdb) l
[EOF]

With pdb.patch:

$ ./python.exe test.zip 
> /Users/sasha/Work/python-svn/trunk/test.zip/__main__.py(2)f()
-> pass
(Pdb) l
  1  	def f():
  2  ->	    pass
  3  	
  4  	import pdb
  5  	pdb.runcall(f)
  6  	
  7  	                                
[EOF]