Log the runtime type of messages

lib/src/report.dart

 // Copyright (c) 2015, 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.
 
 /// Summarizes the information produced by the checker.
 library dev_compiler.src.report;
 
 import 'dart:math' show max;
 
 import 'package:analyzer/src/generated/source.dart' show Source;
@@ skipping 92 matching lines @@
   void log(Message message) {
     if (message is StaticInfo) {
       assert((message.node as dynamic).root.element.source == _current);
     }
     // TODO(sigmund): convert to use span information from AST (issue #73)
     final span = message is MessageWithSpan
         ? message.span
         : _file.span(message.begin, message.end);
     final level = message.level;
     final color = useColors ? colorOf(level.name) : null;
-    _checkerLogger.log(level, span.message(message.message, color: color));
+    final text = '[${message.runtimeType}] ${message.message}';
+    _checkerLogger.log(level, span.message(text, color: color));
   }
 
   void clearLibrary(Uri uri) {}
   void clearHtml(Uri uri) {}
   void clearAll() {}
 }
 
 /// A reporter that gathers all the information in a [GlobalSummary].
 class SummaryReporter implements CheckerReporter {
   GlobalSummary result = new GlobalSummary();
@@ skipping 251 matching lines @@
 
   visitMessage(MessageSummary message) {
     var kind = message.kind;
     errorCount.putIfAbsent(currentPackage, () => <String, int>{});
     errorCount[currentPackage].putIfAbsent(kind, () => 0);
     errorCount[currentPackage][kind]++;
     totals.putIfAbsent(kind, () => 0);
     totals[kind]++;
   }
 }