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-rw-r--r--components/script/dom/bindings/js.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/bindings/js.rs b/components/script/dom/bindings/js.rs
index 5b05d3ea99f..21b0e229911 100644
--- a/components/script/dom/bindings/js.rs
+++ b/components/script/dom/bindings/js.rs
@@ -207,6 +207,7 @@ impl MutHeapJSVal {
/// `JS<T>`.
#[must_root]
#[derive(JSTraceable)]
+#[derive(HeapSizeOf)]
pub struct MutHeap<T: HeapGCValue + Copy> {
val: Cell<T>,
}