Make hasNext a getter instead of a method.

lib/utf/utf32.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.
 
 /**
  * Decodes the UTF-32 bytes as an iterable. Thus, the consumer can only convert
  * as much of the input as needed. Determines the byte order from the BOM,
  * or uses big-endian as a default. This method always strips a leading BOM.
  * Set the replacementCharacter to null to throw an ArgumentError
  * rather than replace the bad value.
@@ skipping 201 matching lines @@
           false, replacementCodepoint);
     } else {
       return new Utf32beBytesDecoder(utf32EncodedBytes, offset, length, false,
           replacementCodepoint);
     }
   }
 
   List<int> decodeRest() {
     List<int> codeunits = new List<int>(remaining);
     int i = 0;
-    while (hasNext()) {
+    while (hasNext) {
       codeunits[i++] = next();
     }
     return codeunits;
   }
 
-  bool hasNext() => utf32EncodedBytesIterator.hasNext();
+  bool get hasNext => utf32EncodedBytesIterator.hasNext;
 
   int next() {
     if (utf32EncodedBytesIterator.remaining < 4) {
       utf32EncodedBytesIterator.skip(utf32EncodedBytesIterator.remaining);
       if (replacementCodepoint != null) {
           return replacementCodepoint;
       } else {
         throw new ArgumentError(
             "Invalid UTF32 at ${utf32EncodedBytesIterator.position}");
       }
@@ skipping 71 matching lines @@
     value += (utf32EncodedBytesIterator.next() << 24);
     return value;
   }
 }
 
 bool _validCodepoint(int codepoint) {
   return (codepoint >= 0 && codepoint < UNICODE_UTF16_RESERVED_LO) ||
       (codepoint > UNICODE_UTF16_RESERVED_HI &&
       codepoint < UNICODE_VALID_RANGE_MAX);
 }