1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testStringIncrement.js b/js/src/jit-test/tests/basic/testStringIncrement.js
new file mode 100644
index 000000000..b0cc6775e
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testStringIncrement.js
@@ -0,0 +1,20 @@
+var a, b;
+
+function f(str) {
+    var n;
+    var k;
+    for (var i = 0; i < 18; ++i) {
+	n = str;
+	k = n++;
+	if (k) { }
+    }
+    return [k, n];
+}
+
+[a, b] = f("10");
+assertEq(a, 10);
+assertEq(b, 11);
+
+[a, b] = f("5");
+assertEq(a, 5);
+assertEq(b, 6);