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-rw-r--r--js/src/builtin/TestingFunctions.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/src/builtin/TestingFunctions.cpp b/js/src/builtin/TestingFunctions.cpp
index acf449b7e..a14f9ba69 100644
--- a/js/src/builtin/TestingFunctions.cpp
+++ b/js/src/builtin/TestingFunctions.cpp
@@ -881,7 +881,7 @@ HasChild(JSContext* cx, unsigned argc, Value* vp)
RootedValue parent(cx, args.get(0));
RootedValue child(cx, args.get(1));
- if (!parent.isMarkable() || !child.isMarkable()) {
+ if (!parent.isGCThing() || !child.isGCThing()) {
args.rval().setBoolean(false);
return true;
}