Test for constructor order and bindings.

tests/language/src/Constructor6Test.dart

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// Dart test program for constructors and initializers.
+
+// Super initializer and super constructor body are executed in with the same
+// bindings.
+
+String trace = "";
+
+int E(int i) {
+  trace += "$i-";
+  return i;
+}
+
+class A {
+  // f closes-over arg.  arg needs to be preserved while b2 is initialized.
+  A(arg)
+      : a = E(arg += 1)
+      , f = (() => E(arg += 10)) {
+    // b2 should be initialized between the above initializers and the following
+    // statements.
+    var r1 = f();
+    E(arg += 100);  // If this is the same arg as closed by f, ...
+    var r2 = f();   // .. the effect of +=100 will be seen here.
+  }
+  final a;
+  final f;
+}
+
+class B extends A {
+  // Initializers in order: b1, super, b2.
+  B(x, y) : b1 = E(x++), super(1000), b2 = E(y++) {
+    // Implicit super call to A's body happens here.
+    E(x);
+    E(y);
+    f();
+  }
+  var b1;
+  var b2;
+}
+
+class C extends B {
+  C() : super(10, 20);
+}
+
+main() {
+  var c = new C();
+  Expect.equals("10-1001-20-1011-1111-1121-11-21-1131-", trace);
+}