Make isEmpty a getter.

runtime/bin/path_impl.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.
 
 class _Path implements Path {
   final String _path;
 
   _Path(String source) : _path = source;
   _Path.fromNative(String source) : _path = _clean(source);
 
@@ skipping 11 matching lines @@
   static String _cleanWindows(source) {
     // Change \ to /.
     var clean = source.replaceAll('\\', '/');
     // Add / before intial [Drive letter]:
     if (clean.length >= 2 && clean[1] == ':') {
       clean = '/$clean';
     }
     return clean;
   }
 
-  bool get isEmpty => _path.isEmpty();
+  bool get isEmpty => _path.isEmpty;
   bool get isAbsolute => _path.startsWith('/');
   bool get hasTrailingSeparator => _path.endsWith('/');
 
   String toString() => _path;
 
   Path relativeTo(Path base) {
     // Throws exception if an unimplemented or impossible case is reached.
     // Returns a path "relative" such that
     //    base.join(relative) == this.canonicalize.
     // Throws an exception if no such path exists, or the case is not
@@ skipping 79 matching lines @@
     if (segs.last() == '') segs.removeLast();  // Path ends with /.
     // No remaining segments can be ., .., or empty.
     return !segs.some((s) => s == '' || s == '.' || s == '..');
   }
 
   Path makeCanonical() {
     bool isAbs = isAbsolute;
     List segs = segments();
     String drive;
     if (isAbs &&
-        !segs.isEmpty() &&
+        !segs.isEmpty &&
         segs[0].length == 2 &&
         segs[0][1] == ':') {
       drive = segs[0];
       segs.removeRange(0, 1);
     }
     List newSegs = [];
     for (String segment in segs) {
       switch (segment) {
         case '..':
           // Absolute paths drop leading .. markers, including after a drive.
-          if (newSegs.isEmpty()) {
+          if (newSegs.isEmpty) {
             if (isAbs) {
               // Do nothing: drop the segment.
             } else {
               newSegs.add('..');
             }
           } else if (newSegs.last() == '..') {
             newSegs.add('..');
           } else {
             newSegs.removeLast();
           }
           break;
         case '.':
         case '':
           // Do nothing - drop the segment.
           break;
         default:
           newSegs.add(segment);
           break;
       }
     }
 
     List segmentsToJoin = [];
     if (isAbs) {
       segmentsToJoin.add('');
       if (drive != null) {
         segmentsToJoin.add(drive);
       }
     }
 
-    if (newSegs.isEmpty()) {
+    if (newSegs.isEmpty) {
       if (isAbs) {
         segmentsToJoin.add('');
       } else {
         segmentsToJoin.add('.');
       }
     } else {
       segmentsToJoin.addAll(newSegs);
       if (hasTrailingSeparator) {
         segmentsToJoin.add('');
       }
@@ skipping 51 matching lines @@
     if (pos < 0) return new Path('');
     while (pos > 0 && _path[pos - 1] == '/') --pos;
     return new Path((pos > 0) ? _path.substring(0, pos) : '/');
   }
 
   String get filename {
     int pos = _path.lastIndexOf('/');
     return _path.substring(pos + 1);
   }
 }