Deprecate ToSourceVisitor

pkg/analyzer/lib/src/dart/ast/utilities.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.src.dart.ast.utilities;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 6751 matching lines @@
       return true;
       // not reached
     }
     return node.end < _position;
   }
 }
 
 /**
  * A visitor used to write a source representation of a visited AST node (and
  * all of it's children) to a writer.
+ *
+ * This class has been deprecated. Use the class ToSourceVisitor2 instead.
  */
+@deprecated
 class ToSourceVisitor implements AstVisitor<Object> {
   /**
    * The writer to which the source is to be written.
    */
   final PrintWriter _writer;
 
   /**
    * Initialize a newly created visitor to write source code representing the
    * visited nodes to the given [writer].
    */
@@ skipping 2284 matching lines @@
     if (node.star != null) {
       sink.write("yield* ");
     } else {
       sink.write("yield ");
     }
     safelyVisitNode(node.expression);
     sink.write(";");
     return null;
   }
 }