| Index: pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart | 
| diff --git a/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart b/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart | 
| index e3bdac5f04012ea9547d1802c070bc42183a6f4e..1ac0b3edbc7150a9f140e79a632d0ce1730af4bc 100644 | 
| --- a/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart | 
| +++ b/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart | 
| @@ -1436,7 +1436,6 @@ class SimpleTypeInferrerVisitor<T> | 
| return inferrer.typeOfNativeBehavior(nativeBehavior); | 
| } else if (name == 'JS_NULL_CLASS_NAME' | 
| || name == 'JS_OBJECT_CLASS_NAME' | 
| -               || name == 'JS_OPERATOR_IS_PREFIX' | 
| || name == 'JS_OPERATOR_AS_PREFIX' | 
| || name == 'JS_STRING_CONCAT') { | 
| return types.stringType; | 
|  |