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diff --git a/js/src/jit-test/tests/ion/spreadcall-not-optimized-static-2a.js b/js/src/jit-test/tests/ion/spreadcall-not-optimized-static-2a.js
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+++ b/js/src/jit-test/tests/ion/spreadcall-not-optimized-static-2a.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, c = 0, d = 0) {
+ return a + b + c + d;
+}
+
+// The rest argument contains holes.
+function test() {
+ function fn(...rest) {
+ rest[3] = 4;
+ return add(...rest);
+ }
+ for (var i = 0; i < 2000; ++i) {
+ assertEq(fn(1, 2), 7);
+ }
+}
+test();