1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/rest-elements.js b/js/src/jit-test/tests/warp/rest-elements.js
new file mode 100644
index 0000000000..28525ad215
--- /dev/null
+++ b/js/src/jit-test/tests/warp/rest-elements.js
@@ -0,0 +1,40 @@
+// |jit-test| --ion-inlining=off; --fast-warmup
+function calleeWithFormals(a, b, ...arr) {
+    assertEq(b, 2);
+    if (arr.length > 0) {
+        assertEq(arr[0], 3);
+    }
+    if (arr.length > 1) {
+        assertEq(arr[1], Math);
+    }
+    if (arr.length > 2) {
+        assertEq(arr[2], "foo");
+    }
+    return arr;
+}
+function calleeWithoutFormals(...arr) {
+    if (arr.length > 0) {
+        assertEq(arr[0], 3);
+    }
+    if (arr.length > 1) {
+        assertEq(arr[1], Math);
+    }
+    if (arr.length > 2) {
+        assertEq(arr[2], "foo");
+    }
+    return arr;
+}
+function f() {
+    for (var i = 0; i < 100; i++) {
+        assertEq(calleeWithFormals(1, 2).length, 0);
+        assertEq(calleeWithFormals(1, 2, 3).length, 1);
+        assertEq(calleeWithFormals(1, 2, 3, Math).length, 2);
+        assertEq(calleeWithFormals(1, 2, 3, Math, "foo").length, 3);
+
+        assertEq(calleeWithoutFormals().length, 0);
+        assertEq(calleeWithoutFormals(3).length, 1);
+        assertEq(calleeWithoutFormals(3, Math).length, 2);
+        assertEq(calleeWithoutFormals(3, Math, "foo").length, 3);
+    }
+}
+f();