Make isEmpty a getter.

lib/compiler/implementation/scanner/class_element_parser.dart

 // Copyright (c) 2011, 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.
 
 class ClassElementParser extends PartialParser {
   ClassElementParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }
 
@@ skipping 23 matching lines @@
 
   ClassNode parseNode(Compiler compiler) {
     if (cachedNode != null) return cachedNode;
     compiler.withCurrentElement(this, () {
       compiler.parser.measure(() {
         MemberListener listener = new MemberListener(compiler, this);
         Parser parser = new ClassElementParser(listener);
         Token token = parser.parseTopLevelDeclaration(beginToken);
         assert(identical(token, endToken.next));
         cachedNode = listener.popNode();
-        assert(listener.nodes.isEmpty());
+        assert(listener.nodes.isEmpty);
       });
       compiler.patchParser.measure(() {
         if (isPatched) {
           // TODO(lrn): Perhaps extract functionality so it doesn't
           // need compiler.
           compiler.patchParser.parsePatchClassNode(patch);
         }
       });
     });
     return cachedNode;
@@ skipping 107 matching lines @@
     pushNode(null); // Super expects an expression, but
                     // ClassElementParser just skips expressions.
     super.endInitializer(assignmentOperator);
   }
 
   void endInitializers(int count, Token beginToken, Token endToken) {
     pushNode(null);
   }
 
   void addMember(Element memberElement) {
-    for (Link link = metadata; !link.isEmpty(); link = link.tail) {
+    for (Link link = metadata; !link.isEmpty; link = link.tail) {
       memberElement.addMetadata(link.head);
     }
     metadata = const Link<MetadataAnnotation>();
     enclosingElement.addMember(memberElement, listener);
   }
 }