New tests for initializing formal access.

tests/language/initializing_formal_final_test.dart

 // Copyright (c) 2016, 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.
 //
 // DartOptions=--initializing-formal-access
 
 import "package:expect/expect.dart";
 
-class C {
-  final int x;
-  final int y;
-
-  const C.constant(this.x) : y = x + 1;
-
-  C(this.x) : y = x + 1 {
-    int z = x + 2;
-    assert(z == y + 1);
-  }
+class A {
+  var x, y;
+  // This should cause a warning because `x` is final when
+  // accessed as an initializing formal.
+  A(this.x) : y = (() { x = 3; });
 }
 
 main() {
-  C c = new C(2);
-  Expect.equals(c.x, 2);
-  Expect.equals(c.y, 3);
-  const C cc = const C.constant(4);
-  Expect.equals(cc.x, 4);
-  Expect.equals(cc.y, 5);
+  A a = new A(2);
+  Expect.equals(a.x, 2);
+  Expect.throws(() => a.y(), (e) => e is NoSuchMethodError);
 }