Make isEmpty a getter.

lib/compiler/implementation/scanner/array_based_scanner.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.
 
 abstract
 class ArrayBasedScanner<S extends SourceString> extends AbstractScanner<S> {
   int get charOffset => byteOffset + extraCharOffset;
   final Token tokens;
   Token tail;
   int tokenStart;
@@ skipping 47 matching lines @@
     tail.next = new KeywordToken(keyword, tokenStart);
     tail = tail.next;
   }
 
   void appendEofToken() {
     tail.next = new Token(EOF_INFO, charOffset);
     tail = tail.next;
     // EOF points to itself so there's always infinite look-ahead.
     tail.next = tail;
     discardOpenLt();
-    while (!groupingStack.isEmpty()) {
+    while (!groupingStack.isEmpty) {
       BeginGroupToken begin = groupingStack.head;
       begin.endGroup = tail;
       groupingStack = groupingStack.tail;
     }
   }
 
   void beginToken() {
     tokenStart = charOffset;
   }
 
@@ skipping 18 matching lines @@
     tail.next = token;
     tail = tail.next;
     if (!identical(info.kind, LT_TOKEN)) discardOpenLt();
     groupingStack = groupingStack.prepend(token);
   }
 
   int appendEndGroup(PrecedenceInfo info, String value, int openKind) {
     assert(!identical(openKind, LT_TOKEN));
     appendStringToken(info, value);
     discardOpenLt();
-    if (groupingStack.isEmpty()) {
+    if (groupingStack.isEmpty) {
       return advance();
     }
     BeginGroupToken begin = groupingStack.head;
     if (!identical(begin.kind, openKind)) {
       if (!identical(openKind, OPEN_CURLY_BRACKET_TOKEN) ||
           !identical(begin.kind, STRING_INTERPOLATION_TOKEN)) {
         // Not ending string interpolation.
         return error(new SourceString('Unmatched ${begin.stringValue}'));
       }
       // We're ending an interpolated expression.
       begin.endGroup = tail;
       groupingStack = groupingStack.tail;
       // Using "start-of-text" to signal that we're back in string
       // scanning mode.
       return $STX;
     }
     begin.endGroup = tail;
     groupingStack = groupingStack.tail;
     return advance();
   }
 
   void appendGt(PrecedenceInfo info, String value) {
     appendStringToken(info, value);
-    if (groupingStack.isEmpty()) return;
+    if (groupingStack.isEmpty) return;
     if (identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack.head.endGroup = tail;
       groupingStack = groupingStack.tail;
     }
   }
 
   void appendGtGt(PrecedenceInfo info, String value) {
     appendStringToken(info, value);
-    if (groupingStack.isEmpty()) return;
+    if (groupingStack.isEmpty) return;
     if (identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack = groupingStack.tail;
     }
-    if (groupingStack.isEmpty()) return;
+    if (groupingStack.isEmpty) return;
     if (identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack.head.endGroup = tail;
       groupingStack = groupingStack.tail;
     }
   }
 
   void appendGtGtGt(PrecedenceInfo info, String value) {
     appendStringToken(info, value);
-    if (groupingStack.isEmpty()) return;
+    if (groupingStack.isEmpty) return;
     if (identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack = groupingStack.tail;
     }
-    if (groupingStack.isEmpty()) return;
+    if (groupingStack.isEmpty) return;
     if (identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack = groupingStack.tail;
     }
-    if (groupingStack.isEmpty()) return;
+    if (groupingStack.isEmpty) return;
     if (identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack.head.endGroup = tail;
       groupingStack = groupingStack.tail;
     }
   }
 
   void appendComment() {
     if (!includeComments) return;
     SourceString value = utf8String(tokenStart, -1);
     appendByteStringToken(COMMENT_INFO, value);
   }
 
   void discardOpenLt() {
-    while (!groupingStack.isEmpty()
+    while (!groupingStack.isEmpty
         && identical(groupingStack.head.kind, LT_TOKEN)) {
       groupingStack = groupingStack.tail;
     }
   }
 
   // TODO(ahe): make class abstract instead of adding an abstract method.
   abstract peek();
 }