1 files changed, 65 insertions, 0 deletions
diff --git a/js/src/tests/non262/expressions/short-circuit-compound-assignment-deleted-decl-binding.js b/js/src/tests/non262/expressions/short-circuit-compound-assignment-deleted-decl-binding.js
new file mode 100644
index 0000000000..256278a938
--- /dev/null
+++ b/js/src/tests/non262/expressions/short-circuit-compound-assignment-deleted-decl-binding.js
@@ -0,0 +1,65 @@
+// Test when a declarative binding is deleted.
+
+// ES2020, 8.1.1.1.5 SetMutableBinding ( N, V, S )
+//
+// 1. ...
+// 2. If envRec does not have a binding for N, then
+//   a. ...
+//   b. Perform envRec.CreateMutableBinding(N, true).
+//   c. Perform envRec.InitializeBinding(N, V).
+//   d. Return NormalCompletion(empty).
+// 3. ...
+
+// AndAssignExpr
+{
+  let a = 0;
+
+  let f = function() {
+    eval("var a = 1;");
+
+    a &&= (delete a, 2);
+
+    assertEq(a, 2);
+  }
+
+  f();
+
+  assertEq(a, 0);
+}
+
+// OrAssignExpr
+{
+  let a = 1;
+
+  let f = function() {
+    eval("var a = 0;");
+
+    a ||= (delete a, 2);
+
+    assertEq(a, 2);
+  }
+
+  f();
+
+  assertEq(a, 1);
+}
+
+// CoalesceAssignExpr
+{
+  let a = undefined;
+
+  let f = function() {
+    eval("var a = null;");
+
+    a ??= (delete a, 2);
+
+    assertEq(a, 2);
+  }
+
+  f();
+
+  assertEq(a, undefined);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0);