VM can parse and ignore metadata

tests/language/metadata_test.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.
+
+// Test ensuring that compiler can parse metadata. Need to add negative
+// test cases with illegal metadata annotations.
+
+#import("metadata_lib.dart", prefix: "Meta");
+
+class Tag {
+  final String annotation;
+  const Tag(this.annotation);
+}
+
+const meta1 = 1;
+const meta2 = const Tag("meta2");
+
+const extern = const Tag("external");
+
+@meta1 var topLevelVar;
+@Meta.Alien.unspecified() List unknownUnknowns;
+
+@meta1 typedef int DingDong<@meta2 T>(@meta1 event);
+
+@meta1 class A <@Tag("typeParam") T> {
+  @meta1 @meta2
+  static String staticField;
+
+  @Meta.Alien("ET") void foo(@meta1 bool fool, {@meta1 @Tag("opt") x: 100}) {
+    return x;
+  }
+
+  @Tag(@"timewarp")
+  List<int> getNextWeeksLottoNumbers() => [1, 2, 3, 4, 5, 6];
+}
+
+@meta1 main() {
+  @meta1 var a = new A();
+  Expect.equals(0, a.foo(false, x: 0));
+
+  for (@Tag("loopvar") int i = 0; i < 10; i++) {
+    // Do something.
+  }
+
+  @meta1 var s = @'This is a raw \\ string.';
+}