[JS:Engine] Implement the Optional Chaining operator (?.)

1 files changed, 20 insertions, 0 deletions

diff --git a/js/src/tests/test262/language/optional-chaining/iteration-statement-do.js b/js/src/tests/test262/language/optional-chaining/iteration-statement-do.js
new file mode 100644
index 000000000..470f067b2
--- /dev/null
+++ b/js/src/tests/test262/language/optional-chaining/iteration-statement-do.js
@@ -0,0 +1,20 @@
+// Copyright 2019 Google, LLC.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: prod-OptionalExpression
+description: >
+  optional chain in test portion of do while statement
+info: |
+  IterationStatement
+    do Statement while (OptionalExpression)
+features: [optional-chaining]
+---*/
+let count = 0;
+const obj = {a: true};
+do {
+  count++;
+  break;
+} while (obj?.a);
+assert.sameValue(1, count);
+
+reportCompare(0, 0);