Manual fixes for Dart^2 analyzer

pkg/analyzer_experimental/lib/src/generated/error.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.error;
 
 import 'java_core.dart';
 import 'source.dart';
 import 'ast.dart' show ASTNode;
 import 'scanner.dart' show Token;
 
@@ skipping 1377 matching lines @@
   String toString() => __name;
 }
 /**
  * The interface {@code AnalysisErrorListener} defines the behavior of objects that listen for{@link AnalysisError analysis errors} being produced by the analysis engine.
  * @coverage dart.engine.error
  */
 abstract class AnalysisErrorListener {
   /**
    * An error listener that ignores errors that are reported to it.
    */
-  AnalysisErrorListener _NULL_LISTENER = new AnalysisErrorListener_4();
+  static AnalysisErrorListener _NULL_LISTENER = new AnalysisErrorListener_4();
   /**
    * This method is invoked when an error has been found by the analysis engine.
    * @param error the error that was just found (not {@code null})
    */
   void onError(AnalysisError error);
 }
 class AnalysisErrorListener_4 implements AnalysisErrorListener {
   void onError(AnalysisError event) {
   }
 }
@@ skipping 224 matching lines @@
   StaticTypeWarningCode(this.__name, this.__ordinal, String message) {
     this._message = message;
   }
   ErrorSeverity get errorSeverity => ErrorType.STATIC_TYPE_WARNING.severity;
   String get message => _message;
   ErrorType get type => ErrorType.STATIC_TYPE_WARNING;
   bool needsRecompilation() => true;
   int compareTo(StaticTypeWarningCode other) => __ordinal - other.__ordinal;
   String toString() => __name;
 }