Private fields

test/mjsunit/harmony/class-privates-evaluation-order.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-class-fields --harmony-private-class-fields
+
+{
+  let effects = [];
+  class C {
+    [effects.push(0)] = effects.push(2);
+    #a = effects.push(3);
+    [effects.push(1)] = effects.push(4);
+    #b = effects.push(5);
+
+    constructor() {
+      effects.push(6);
+    }
+  }
+
+  assertArrayEquals([0, 1], effects);
+  new C;
+  assertArrayEquals([0, 1, 2, 3, 4, 5, 6], effects);
+}
+
+{
+  let effects = [];
+
+  class Base {
+    #a = effects.push(1);
+
+    constructor() {
+      effects.push(2);
+    }
+  }
+
+  class Derived extends Base {
+    #a = effects.push(3);
+
+    constructor() {
+      effects.push(0);
+      super();
+      effects.push(4);
+    }
+  }
+
+  new Derived;
+  assertArrayEquals([0, 1, 2, 3, 4], effects);
+}
+
+// TODO(bakkot) figure out how duplicate fields work