Fix to dartbug.com/5170, explictly static library variables now get an appropriate error message.

lib/compiler/implementation/tree/nodes.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.
 
 abstract class Visitor<R> {
   const Visitor();
 
   abstract R visitNode(Node node);
 
   R visitBlock(Block node) => visitStatement(node);
@@ skipping 1153 matching lines @@
       else if (value === 'abstract') flags |= FLAG_ABSTRACT;
       else if (value === 'final') flags |= FLAG_FINAL;
       else if (value === 'var') flags |= FLAG_VAR;
       else if (value === 'const') flags |= FLAG_CONST;
       else if (value === 'factory') flags |= FLAG_FACTORY;
       else if (value === 'external') flags |= FLAG_EXTERNAL;
       else throw 'internal error: ${nodes.head}';
     }
     return flags;
   }
+  
+  Node findModifier(String modifier) {
+    Link<Node> nodeList = nodes.nodes;
+    for (; !nodeList.isEmpty(); nodeList = nodeList.tail) {
+      String value = nodeList.head.asIdentifier().source.stringValue;
+      if(value === modifier) {
+        return nodeList.head;
+      }
+    }
+    return null;
+  }
 
   Modifiers asModifiers() => this;
   Token getBeginToken() => nodes.getBeginToken();
   Token getEndToken() => nodes.getEndToken();
   accept(Visitor visitor) => visitor.visitModifiers(this);
   visitChildren(Visitor visitor) => nodes.accept(visitor);
 
   bool isStatic() => (flags & FLAG_STATIC) != 0;
   bool isAbstract() => (flags & FLAG_ABSTRACT) != 0;
   bool isFinal() => (flags & FLAG_FINAL) != 0;
   bool isVar() => (flags & FLAG_VAR) != 0;
   bool isConst() => (flags & FLAG_CONST) != 0;
   bool isFactory() => (flags & FLAG_FACTORY) != 0;
   bool isExternal() => (flags & FLAG_EXTERNAL) != 0;
 
+  Node getStatic() => findModifier('static');
+
   /**
    * Use this to check if the declaration is either explicitly or implicitly
    * final.
    */
   bool isFinalOrConst() => isFinal() || isConst();
 
   String toString() {
     LinkBuilder<String> builder = new LinkBuilder<String>();
     if (isStatic()) builder.addLast('static');
     if (isAbstract()) builder.addLast('abstract');
@@ skipping 780 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send !== null) return f(send.arguments.head);
 }