http://bugs.python.org/issue2459 -- speed up loops

Lib/test/test_trace.py

 # Testing the line trace facility.
 
 from test import test_support
 import unittest
 import sys
 import difflib
 import gc
 
 # A very basic example.  If this fails, we're in deep trouble.
 def basic():
@@ skipping 333 matching lines @@
             onliners,
             [(0, 'call'),
              (1, 'line'),
              (3, 'line'),
              (3, 'return')])
 
     def test_15_loops(self):
         # issue1750076: "while" expression is skipped by debugger
         def for_example():
             for x in range(2):
-                pass
+                y = x
         self.run_and_compare(
             for_example,
             [(0, 'call'),
              (1, 'line'),
              (2, 'line'),
              (1, 'line'),
              (2, 'line'),
              (1, 'line'),
              (1, 'return')])
 
@@ skipping 377 matching lines @@
 
 def test_main():
     test_support.run_unittest(
         TraceTestCase,
         RaisingTraceFuncTestCase,
         JumpTestCase
     )
 
 if __name__ == "__main__":
     test_main()