1 files changed, 9 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/bug1663993.js b/js/src/jit-test/tests/warp/bug1663993.js
new file mode 100644
index 0000000000..c7199e85cf
--- /dev/null
+++ b/js/src/jit-test/tests/warp/bug1663993.js
@@ -0,0 +1,9 @@
+function r(relazify) {
+    "foo".substr(0);
+    if (relazify) relazifyFunctions();
+}
+
+for (var i = 0; i < 10; i++) {
+    r(i == 9);
+    r("");
+}