Implement future unicode_literals. (#286)

compiler/imputil.py

@@ -180,7 +180,11 @@ _FUTURE_FEATURES = (
     'unicode_literals',
 )
 
-_IMPLEMENTED_FUTURE_FEATURES = ('absolute_import', 'print_function',)
+_IMPLEMENTED_FUTURE_FEATURES = (
+    'absolute_import',
+    'print_function',
+    'unicode_literals'
+)
 
 # These future features are already in the language proper as of 2.6, so
 # importing them via __future__ has no effect.

compiler/imputil_test.py

@@ -279,8 +279,6 @@ class MakeFutureFeaturesTest(unittest.TestCase):
         # by grumpy
         ('from __future__ import division',
          r'future feature \w+ not yet implemented'),
-        ('from __future__ import unicode_literals',
-         r'future feature \w+ not yet implemented'),
         ('from __future__ import braces', 'not a chance'),
         ('from __future__ import nonexistant_feature',
          r'future feature \w+ is not defined'),

compiler/stmt_test.py

@@ -303,6 +303,12 @@ class StatementVisitorTest(unittest.TestCase):
     self.assertRaisesRegexp(util.ImportError, regexp, _ParseAndVisit,
                             'foo = bar\nfrom __future__ import print_function')
 
+  def testFutureUnicodeLiterals(self):
+    want = "u'foo'\n"
+    self.assertEqual((0, want), _GrumpRun(textwrap.dedent("""\
+        from __future__ import unicode_literals
+        print repr('foo')""")))
+
   def testImportMember(self):
     self.assertEqual((0, "<type 'dict'>\n"), _GrumpRun(textwrap.dedent("""\
         from sys import modules