Make isEmpty a getter.

lib/compiler/implementation/util/link.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 Link<T> implements Iterable<T> {
   T get head => null;
   Link<T> get tail => null;
 
   factory Link.fromList(List<T> list) {
     switch (list.length) {
@@ skipping 21 matching lines @@
     return new LinkEntry<T>(element, this);
   }
 
   Iterator<T> iterator() => new LinkIterator<T>(this);
 
   void printOn(StringBuffer buffer, [separatedBy]) {
   }
 
   List toList() => new List<T>(0);
 
-  bool isEmpty() => true;
+  bool get isEmpty => true;
 
   Link<T> reverse() => this;
 
   Link<T> reversePrependAll(Link<T> from) {
-    if (from.isEmpty()) return this;
+    if (from.isEmpty) return this;
     return this.prepend(from.head).reversePrependAll(from.tail);
   }
 
   void forEach(void f(T element)) {}
 
   bool operator ==(other) {
     if (other is !Link<T>) return false;
-    return other.isEmpty();
+    return other.isEmpty;
   }
 
   String toString() => "[]";
 }
 
 interface LinkBuilder<T> default LinkBuilderImplementation<T> {
   LinkBuilder();
 
   Link<T> toLink();
   void addLast(T t);
 
   final int length;
 }