1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/class/bug1715318.js b/js/src/jit-test/tests/class/bug1715318.js
new file mode 100644
index 0000000000..6513cfeb8a
--- /dev/null
+++ b/js/src/jit-test/tests/class/bug1715318.js
@@ -0,0 +1,18 @@
+// |jit-test| --no-threads; --fast-warmup
+function f() {
+    // A non-constructor with a null .prototype.
+    let arrow = _ => null;
+    arrow.prototype = null;
+
+    // Warm up.
+    for (var i = 0; i < 100; i++) {}
+
+    try {
+        class C1 extends arrow {}
+        throw "Fail";
+    } catch (e) {
+        assertEq(e instanceof TypeError, true);
+    }
+}
+f();
+f();