Add a field to ClassNode that holds a NodeList of its members.

lib/compiler/implementation/tree/unparser.dart

 // Copyright (c) 2012, 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.
 
 // Returns null if no need to rename a node.
 typedef String Renamer(Node node);
 
 class Unparser implements Visitor {
   Renamer rename;
   StringBuffer sb;
@@ skipping 42 matching lines @@
     visit(node.expression);
   }
 
   visitCascadeReceiver(CascadeReceiver node) {
     visit(node.expression);
   }
 
   visitClassNode(ClassNode node) {
     addToken(node.beginToken);
     visit(node.name);
+    if (node.typeParameters !== null) {
+      visit(node.typeParameters);
+    }
     sb.add(' ');
     if (node.extendsKeyword !== null) {
       addToken(node.extendsKeyword);
       visit(node.superclass);
       sb.add(' ');
     }
     visit(node.interfaces);
     if (node.defaultClause !== null) {
       visit(node.defaultClause);
       sb.add(' ');
     }
     sb.add('{\n');
+    NodeList body = node.body;
+    if (body !== null) {
+      Link nodes = body.nodes;
+      if (!nodes.isEmpty()) {
+        sb.add('  ');
+        nodes.printOn(sb, '\n  ');
+        sb.add('\n');
+      }
+    }
     sb.add('}\n');
   }
 
   visitConditional(Conditional node) {
     visit(node.condition);
     add(node.questionToken.value);
     visit(node.thenExpression);
     add(node.colonToken.value);
     visit(node.elseExpression);
   }
@@ skipping 403 matching lines @@
       sb.add(' ');
     }
     visit(node.name);
     if (node.typeParameters !== null) {
       visit(node.typeParameters);
     }
     visit(node.formals);
     add(node.endToken.value);
   }
 }