Make isEmpty a getter.

lib/core/sequences.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.
 
 /**
  * An indexed sequence of elements of the same type.
  *
  * This is a primitive interface that any finite integer-indexable
  * sequence can implement.
  * It is intended for data structures where access by index is
@@ skipping 67 matching lines @@
     return true;
   }
 
   bool some(bool f(E element)) {
     for (int i = 0; i < this.length; i++) {
       if (f(this[i])) return true;
     }
     return false;
   }
 
-  bool isEmpty() {
+  bool get isEmpty {
     return this.length == 0;
   }
 }
 
 
 /**
  * An unmodifiable [List] backed by a [Sequence].
  */
 class SequenceList<E> extends SequenceCollection<E> implements List<E> {
   Sequence<E> sequence;
@@ skipping 96 matching lines @@
   Sequence<E> _sequence;
   int _position;
   SequenceIterator(this._sequence) : _position = 0;
   bool get hasNext => _position < _sequence.length;
   E next() {
     if (hasNext) return _sequence[_position++];
     throw new NoMoreElementsException();
   }
 }