1 files changed, 3 insertions, 3 deletions
diff --git a/js/src/ds/Fifo.h b/js/src/ds/Fifo.h
index 4946c8452c..61426aa7b0 100644
--- a/js/src/ds/Fifo.h
+++ b/js/src/ds/Fifo.h
@@ -94,7 +94,7 @@ class Fifo
     // Push an element to the back of the queue. This method can take either a
     // |const T&| or a |T&&|.
     template <typename U>
-    MOZ_MUST_USE bool pushBack(U&& u) {
+    [[nodiscard]] bool pushBack(U&& u) {
         if (!rear_.append(mozilla::Forward<U>(u)))
             return false;
         if (!fixup()) {
@@ -106,7 +106,7 @@ class Fifo
 
     // Construct a T in-place at the back of the queue.
     template <typename... Args>
-    MOZ_MUST_USE bool emplaceBack(Args&&... args) {
+    [[nodiscard]] bool emplaceBack(Args&&... args) {
         if (!rear_.emplaceBack(mozilla::Forward<Args>(args)...))
             return false;
         if (!fixup()) {
@@ -127,7 +127,7 @@ class Fifo
     }
 
     // Remove the front element from the queue.
-    MOZ_MUST_USE bool popFront() {
+    [[nodiscard]] bool popFront() {
         MOZ_ASSERT(!empty());
         T t(mozilla::Move(front()));
         front_.popBack();