| Index: src/flag-definitions.h | 
| diff --git a/src/flag-definitions.h b/src/flag-definitions.h | 
| index ef89cac35af6340d74de8e413d103bcf67ae091c..9b8ea1405dc9591982652fee7cc7383a4bf1545d 100644 | 
| --- a/src/flag-definitions.h | 
| +++ b/src/flag-definitions.h | 
| @@ -259,6 +259,7 @@ DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations") | 
| DEFINE_BOOL(vector_ics, false, "support vector-based ics") | 
| DEFINE_BOOL(experimental_classes, false, | 
| "experimental new semantics for super() calls") | 
| +DEFINE_BOOL(strong_mode, false, "experimental strong language mode") | 
| DEFINE_IMPLICATION(experimental_classes, harmony_classes) | 
| DEFINE_IMPLICATION(experimental_classes, harmony_object_literals) | 
|  | 
|  |