1 files changed, 90 insertions, 0 deletions
diff --git a/js/src/tests/non262/expressions/short-circuit-compound-assignment-const.js b/js/src/tests/non262/expressions/short-circuit-compound-assignment-const.js
new file mode 100644
index 0000000000..8499e2fb74
--- /dev/null
+++ b/js/src/tests/non262/expressions/short-circuit-compound-assignment-const.js
@@ -0,0 +1,90 @@
+// Test assignment to const and function name bindings. The latter is kind of a
+// const binding, but only throws in strict mode.
+
+function notEvaluated() {
+  throw new Error("should not be evaluated");
+}
+
+// AndAssignExpr with const lexical binding.
+{
+  const a = false;
+  a &&= notEvaluated();
+  assertEq(a, false);
+
+  const b = true;
+  assertThrowsInstanceOf(() => { b &&= 1; }, TypeError);
+  assertEq(b, true);
+}
+
+// AndAssignExpr with function name binding.
+{
+  let f = function fn() {
+    fn &&= true;
+    assertEq(fn, f);
+  };
+  f();
+
+  let g = function fn() {
+    "use strict";
+    assertThrowsInstanceOf(() => { fn &&= 1; }, TypeError);
+    assertEq(fn, g);
+  };
+  g();
+}
+
+// OrAssignExpr with const lexical binding.
+{
+  const a = true;
+  a ||= notEvaluated();
+  assertEq(a, true);
+
+  const b = false;
+  assertThrowsInstanceOf(() => { b ||= 0; }, TypeError);
+  assertEq(b, false);
+}
+
+// OrAssignExpr with function name binding.
+{
+  let f = function fn() {
+    fn ||= notEvaluated();
+    assertEq(fn, f);
+  };
+  f();
+
+  let g = function fn() {
+    "use strict";
+    fn ||= notEvaluated();
+    assertEq(fn, g);
+  };
+  g();
+}
+
+// CoalesceAssignExpr with const lexical binding.
+{
+  const a = true;
+  a ??= notEvaluated();
+  assertEq(a, true);
+
+  const b = null;
+  assertThrowsInstanceOf(() => { b ??= 0; }, TypeError);
+  assertEq(b, null);
+}
+
+// CoalesceAssignExpr with function name binding.
+{
+  let f = function fn() {
+    fn ??= notEvaluated();
+    assertEq(fn, f);
+  };
+  f();
+
+  let g = function fn() {
+    "use strict";
+    fn ??= notEvaluated();
+    assertEq(fn, g);
+  };
+  g();
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0);