Assignment with left-hand side property accessor

The assignment operator evaluates its operands from left to right. When
the left-hand side expression is a property accessor, RequireObjectCoercible
and ToPropertyKey are called on the property accessor before the right-hand
side expression is evaluated.

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diff --git a/test/language/expressions/compound-assignment/S11.13.2_A7.2_T2.js b/test/language/expressions/compound-assignment/S11.13.2_A7.2_T2.js
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+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Compound Assignment Operator evaluates its operands from left to right.
+description: >
+    The left-hand side expression is evaluated before the right-hand side.
+    Left-hand side expression is MemberExpression: base[prop]. base is the
+    undefined value.
+    Check operator is "x /= y".
+---*/
+
+function DummyError() { }
+
+assert.throws(DummyError, function() {
+  var base = undefined;
+  var prop = function() {
+    throw new DummyError();
+  };
+  var expr = function() {
+    $ERROR("right-hand side expression evaluated");
+  };
+
+  base[prop()] /= expr();
+});
+
+assert.throws(TypeError, function() {
+  var base = undefined;
+  var prop = {
+    toString: function() {
+      $ERROR("property key evaluated");
+    }
+  };
+  var expr = function() {
+    $ERROR("right-hand side expression evaluated");
+  };
+
+  base[prop] /= expr();
+});