1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/non262/expressions/optional-chain-tdz.js b/js/src/tests/non262/expressions/optional-chain-tdz.js
new file mode 100644
index 0000000000..e12d0fb860
--- /dev/null
+++ b/js/src/tests/non262/expressions/optional-chain-tdz.js
@@ -0,0 +1,28 @@
+// Test TDZ for optional chaining.
+
+// TDZ for lexical |let| bindings with optional chaining.
+{
+  assertThrowsInstanceOf(() => {
+    const Null = null;
+    Null?.[b];
+    b = 0;
+    let b;
+  }, ReferenceError);
+
+  assertThrowsInstanceOf(() => {
+    const Null = null;
+    Null?.[b]();
+    b = 0;
+    let b;
+  }, ReferenceError);
+
+  assertThrowsInstanceOf(() => {
+    const Null = null;
+    delete Null?.[b];
+    b = 0;
+    let b;
+  }, ReferenceError);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);