Fix to handle loop variables not declared in the for.

pkg/analyzer/lib/src/services/formatter_impl.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.
 
 library formatter_impl;
 
 import 'dart:math';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/java_core.dart' show CharSequence;
@@ skipping 736 matching lines @@
     token(node.thisToken);
     token(node.period);
     visit(node.identifier);
     visit(node.parameters);
   }
 
   visitForEachStatement(ForEachStatement node) {
     token(node.forKeyword);
     space();
     token(node.leftParenthesis);
-    visit(node.loopVariable);
+    if (node.loopVariable != null) {
+      visit(node.loopVariable);
+    } else {
+      visit(node.identifier);
+    }
     space();
     token(node.inKeyword);
     space();
     visit(node.iterator);
     token(node.rightParenthesis);
     space();
     visit(node.body);
   }
 
   visitFormalParameterList(FormalParameterList node) {
@@ skipping 900 matching lines @@
     var lastLine =
         lineInfo.getLocation(lastOffset).lineNumber;
     var currentLine =
         lineInfo.getLocation(currentOffset).lineNumber;
     return currentLine - lastLine;
   }
 
   String toString() => writer.toString();
 
 }