1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/auto-regress/bug1689880-2.js b/js/src/jit-test/tests/auto-regress/bug1689880-2.js
new file mode 100644
index 0000000000..2fefdc7ce2
--- /dev/null
+++ b/js/src/jit-test/tests/auto-regress/bug1689880-2.js
@@ -0,0 +1,14 @@
+// |jit-test| error: ReferenceError
+
+// We elide the uninitialised lexical check for the second access to |x|,
+// because we statically know that the first access will throw an error.
+// `x ? . : .` is compiled straight from bytecode without going through any
+// ICs, so already on first (eager) compilation we may be Warp compiling.
+
+function testConditional(x = (x, (x ? 1 : 0))) {
+    function inner() {
+        // Close over |x|.
+        x;
+    }
+}
+testConditional();