@@ -56,6 +56,7 @@
     "print_function",
     "unicode_literals",
     "barry_as_FLUFL",
+    "generator_stop",
 ]
 
 __all__ = ["all_feature_names"] + all_feature_names
@@ -72,6 +73,7 @@
 CO_FUTURE_PRINT_FUNCTION  = 0x10000   # print function
 CO_FUTURE_UNICODE_LITERALS = 0x20000 # unicode string literals
 CO_FUTURE_BARRY_AS_BDFL = 0x40000
+CO_FUTURE_GENERATOR_STOP  = 0x80000 # StopIteration becomes RuntimeError in generators
 
 class _Feature:
     def __init__(self, optionalRelease, mandatoryRelease, compiler_flag):
@@ -132,3 +134,7 @@ def __repr__(self):
 barry_as_FLUFL = _Feature((3, 1, 0, "alpha", 2),
                          (3, 9, 0, "alpha", 0),
                          CO_FUTURE_BARRY_AS_BDFL)
+
+generator_stop = _Feature((3, 5, 0, "beta", 1),
+                         (3, 7, 0, "alpha", 0),
+                         CO_FUTURE_GENERATOR_STOP)