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diff --git a/js/src/jit-test/tests/ion/spreadcall-not-optimized-static-6a.js b/js/src/jit-test/tests/ion/spreadcall-not-optimized-static-6a.js
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+++ b/js/src/jit-test/tests/ion/spreadcall-not-optimized-static-6a.js
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+// Tests when JSOP_OPTIMIZE_SPREADCALL can't be applied during the initial
+// Ion compilation.
+
+// JSOP_OPTIMIZE_SPREADCALL can be optimised when the following conditions
+// are fulfilled:
+// (1) the argument is an array
+// (2) the array has no hole
+// (3) array[@@iterator] is not modified
+// (4) the array's prototype is Array.prototype
+// (5) Array.prototype[@@iterator] is not modified
+// (6) %ArrayIteratorPrototype%.next is not modified
+
+function add(a, b) {
+ return a + b;
+}
+
+// %ArrayIteratorPrototype%'s [[Prototype]] was changed, as a result all properties are marked as unknown.
+function test() {
+ var ArrayIteratorPrototype = Object.getPrototypeOf(Array.prototype[Symbol.iterator]());
+ Object.setPrototypeOf(ArrayIteratorPrototype, null);
+ function fn(...rest) {
+ return add(...rest);
+ }
+ for (var i = 0; i < 2000; ++i) {
+ assertEq(fn(1, 2), 3);
+ }
+}
+test();