restore test for __future__ imports

Implementations of Python which do not observe PEP 401 may experience
trouble with this test.

IPython/core/tests/test_interactiveshell.py

@@ -143,8 +143,9 b' class InteractiveShellTestCase(unittest.TestCase):'
 
     def test_future_flags(self):
         """Check that future flags are used for parsing code (gh-777)"""
+        ip.run_cell('from __future__ import barry_as_FLUFL')
         try:
-            ip.run_cell('prfunc_return_val = print(1,2, sep=" ")')
+            ip.run_cell('prfunc_return_val = 1 <> 2')
             assert 'prfunc_return_val' in ip.user_ns
         finally:
             # Reset compiler flags so we don't mess up other tests.