1 files changed, 84 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-await-of/async-func-dstr-let-async-obj-ptrn-prop-id-init-skipped.js b/js/src/tests/test262/language/statements/for-await-of/async-func-dstr-let-async-obj-ptrn-prop-id-init-skipped.js
new file mode 100644
index 0000000000..ea3a1ff91e
--- /dev/null
+++ b/js/src/tests/test262/language/statements/for-await-of/async-func-dstr-let-async-obj-ptrn-prop-id-init-skipped.js
@@ -0,0 +1,84 @@
+// |reftest| async
+// This file was procedurally generated from the following sources:
+// - src/dstr-binding-for-await/obj-ptrn-prop-id-init-skipped.case
+// - src/dstr-binding-for-await/default/for-await-of-async-func-let-async.template
+/*---
+description: Destructuring initializer is not evaluated when value is not `undefined` (for-await-of statement)
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [generated, async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+    [...]
+---*/
+var initCount = 0;
+function counter() {
+  initCount += 1;
+}
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [{ s: null, u: 0, w: false, y: '' }];
+})();
+
+async function fn() {
+  for await (let { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } of asyncIter) {
+    assert.sameValue(t, null);
+    assert.sameValue(v, 0);
+    assert.sameValue(x, false);
+    assert.sameValue(z, '');
+    assert.sameValue(initCount, 0);
+
+    assert.throws(ReferenceError, function() {
+      s;
+    });
+    assert.throws(ReferenceError, function() {
+      u;
+    });
+    assert.throws(ReferenceError, function() {
+      w;
+    });
+    assert.throws(ReferenceError, function() {
+      y;
+    });
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);