Sort out the different implementations of EvalFormatter, so we usually use the simple one.

IPython/utils/tests/test_text.py

@@ -76,13 +76,15 b' def eval_formatter_slicing_check(f):'
     
     nt.assert_raises(SyntaxError, f.format, "{n:x}", **ns)
     
-
 def eval_formatter_no_slicing_check(f):
     ns = dict(n=12, pi=math.pi, stuff='hello there', os=os)
     
     s = f.format('{n:x} {pi**2:+f}', **ns)
     nt.assert_equals(s, "c +9.869604")
     
+    s = f.format('{stuff[slice(1,4)]}', **ns)
+    nt.assert_equals(s, 'ell')
+    
     nt.assert_raises(SyntaxError, f.format, "{a[:]}")
 
 def test_eval_formatter():