diff --git a/js/src/trace-test/tests/jaeger/bug585408-2.js b/js/src/trace-test/tests/jaeger/bug585408-2.js
new file mode 100644
index 000000000000..b77f1a98444f
--- /dev/null
+++ b/js/src/trace-test/tests/jaeger/bug585408-2.js
@@ -0,0 +1,6 @@
+for (let c in []) {
+    c << c++
+}
+
+/* Don't assert. */
+
diff --git a/js/src/trace-test/tests/jaeger/bug585408-3.js b/js/src/trace-test/tests/jaeger/bug585408-3.js
new file mode 100644
index 000000000000..9359abad8327
--- /dev/null
+++ b/js/src/trace-test/tests/jaeger/bug585408-3.js
@@ -0,0 +1,7 @@
+(function() {
+  function a() {}
+  a > a--
+})()
+
+/* Don't assert. */
+