garbage collector to collect soon, hoping to reclaim that large non-GC memory
region.
*/
-JS_EXPORT void JSReportExtraMemoryCost(JSContextRef ctx, size_t size) AVAILABLE_AFTER_WEBKIT_VERSION_3_1;
+JS_EXPORT void JSReportExtraMemoryCost(JSContextRef ctx, size_t size) AVAILABLE_IN_WEBKIT_VERSION_4_0;
#ifdef __cplusplus
}