summaryrefslogtreecommitdiffstats
path: root/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js
diff options
context:
space:
mode:
Diffstat (limited to 'js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js')
-rw-r--r--js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js37
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js b/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js
new file mode 100644
index 0000000000..d9fe3d1bc3
--- /dev/null
+++ b/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-destructuring-binding-patterns-runtime-semantics-bindinginitialization
+description: >
+ Destructuring initializer is not evaluated when value is an object
+ with [[IsHTMLDDA]] internal slot.
+info: |
+ BindingPattern : ObjectBindingPattern
+
+ 1. Perform ? RequireObjectCoercible(value).
+ 2. Return the result of performing BindingInitialization for
+ ObjectBindingPattern using value and environment as arguments.
+
+ Runtime Semantics: KeyedBindingInitialization
+
+ SingleNameBinding : BindingIdentifier Initializer[opt]
+
+ [...]
+ 4. If Initializer is present and v is undefined, then
+ [...]
+ 5. If environment is undefined, return ? PutValue(lhs, v).
+features: [destructuring-binding, IsHTMLDDA]
+---*/
+
+var initCount = 0;
+var counter = function() {
+ initCount += 1;
+};
+
+var x, IsHTMLDDA = $262.IsHTMLDDA;
+({x = counter()} = {x: IsHTMLDDA});
+
+assert.sameValue(x, IsHTMLDDA);
+assert.sameValue(initCount, 0);
+
+reportCompare(0, 0);