Retain elements a finer granularity than library.

dart/tests/compiler/dart2js/message_kind_test.dart

+// Copyright (c) 2013, 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.
+
+import '../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart' show
+    DualKind,
+    MessageKind;
+
+import 'message_kind_helper.dart';
+
+import 'dart:mirrors';
+
+main() {
+  ClassMirror cls = reflectClass(MessageKind);
+  Map<String, MessageKind> kinds = <String, MessageKind>{};
+  cls.variables.forEach((Symbol name, VariableMirror variable) {
+    if (variable.isStatic) {
+      var value = cls.getField(name).reflectee;
+      if (value is MessageKind) {
+        kinds[MirrorSystem.getName(name)] = value;
+      } else if (value is DualKind) {
+        kinds['${MirrorSystem.getName(name)}.error'] = value.error;
+        kinds['${MirrorSystem.getName(name)}.warning'] = value.warning;
+      } else {
+        Expect.fail("Weird static field: '${MirrorSystem.getName(name)}'.");
+      }
+    }
+  });
+  List<String> names = kinds.keys.toList()..sort();
+  List<String> examples = <String>[];
+  for (String name in names) {
+    MessageKind kind = kinds[name];
+    if (name == 'GENERIC' // Shouldn't be used.
+        // We can't provoke a crash.
+        || name == 'COMPILER_CRASHED'
+        || name == 'PLEASE_REPORT_THE_CRASH'
+        // We cannot provide examples for patch errors.
+        || name.startsWith('PATCH_')) continue;
+    if (kind.examples != null) {
+      examples.add(name);
+    } else {
+      print("No example in '$name'");
+    }
+  };
+  var cachedCompiler;
+  for (String name in examples) {
+    Stopwatch sw = new Stopwatch()..start();
+    cachedCompiler = check(kinds[name], cachedCompiler);
+    sw.stop();
+    print("Checked '$name' in ${sw.elapsedMilliseconds}ms.");
+  }
+}