1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/bug1488786-2.js b/js/src/jit-test/tests/cacheir/bug1488786-2.js
new file mode 100644
index 0000000000..7ac42f2ce4
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/bug1488786-2.js
@@ -0,0 +1,27 @@
+setJitCompilerOption('ion.forceinlineCaches', 1);
+
+function protoChange() {
+    var o = {0: 0, 1: 0, 0x10000: 0, 0x20000: 0};
+
+    var tests = [1, 0, 0x10000, 0x20000];
+
+    function result_map(key, i) {
+        if (i > 5 && key == 0x20000)
+            return undefined;
+        return 0;
+    }
+
+    for (var i = 0; i < 10; i++) {
+        for (var key of tests) {
+            assertEq(o[key], result_map(key, i));
+        }
+
+        if (i == 5) {
+            delete o[0x20000];
+        }
+    }
+}
+
+for (var i = 0; i < 10; i++) {
+    protoChange();
+}
+\ No newline at end of file