Support static/global field initializations.

frog/tests/leg_only/src/FieldInitializerTest.dart

+// Copyright (c) 2012, 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.
+
+class A {
+  static var a;
+  static var b = c;
+  static final var c = 499;
+  static final var d = c;
+  static final var e = d;
+  static final var f = B.g;
+  static final var h = true;
+  static final var i = false;
+  static final var j = n;
+  static final var k = 4.99;
+  static final var l;
+  static final var m = l;
+  static final var n = 42;
+}
+
+class B {
+  static final var g = A.c;
+}
+
+testInitialValues() {
+  Expect.equals(null, A.a);
+  Expect.equals(499, A.b);
+  Expect.equals(499, A.c);
+  Expect.equals(499, A.d);
+  Expect.equals(499, A.e);
+  Expect.equals(499, A.f);
+  Expect.equals(499, B.g);
+  Expect.equals(true, A.h);
+  Expect.equals(false, A.i);
+  Expect.equals(42, A.j);
+  Expect.equals(4.99, A.k);
+  Expect.equals(null, A.l);
+  Expect.equals(null, A.m);
+  Expect.equals(42, A.n);
+}
+
+testMutation() {
+  A.a = 499;
+  Expect.equals(499, A.a);
+  A.b = 42;
+  Expect.equals(42, A.b);
+  Expect.equals(499, A.c);
+  Expect.equals(499, A.a);
+}
+
+main() {
+  testInitialValues();
+  testMutation();
+}