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-rw-r--r--js/src/jit-test/tests/ion/instanceof-mutate-proto.js13
1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/instanceof-mutate-proto.js b/js/src/jit-test/tests/ion/instanceof-mutate-proto.js
new file mode 100644
index 000000000..e3e057ec4
--- /dev/null
+++ b/js/src/jit-test/tests/ion/instanceof-mutate-proto.js
@@ -0,0 +1,13 @@
+function g(i) {
+ with(this) {}; // Don't inline.
+ if (i === 1500)
+ String.prototype.__proto__ = Array.prototype;
+}
+function f() {
+ var arr = new String("A");
+ for (var i=0; i<2000; i++) {
+ g(i);
+ assertEq(arr instanceof Array, i >= 1500);
+ }
+}
+f();