Static members are not visible in subclasses

frog/tokenizer.g.dart

Index: frog/tokenizer.g.dart
===================================================================
--- frog/tokenizer.g.dart	(revision 6666)
+++ frog/tokenizer.g.dart	(working copy)
@@ -225,9 +225,9 @@
           return _finishToken(TokenKind.BIT_NOT);
         }
       default:
-        if (isIdentifierStart(ch)) {
+        if (TokenizerHelpers.isIdentifierStart(ch)) {
           return this.finishIdentifier(ch);
-        } else if (isDigit(ch)) {
+        } else if (TokenizerHelpers.isDigit(ch)) {
           return this.finishNumber();
         } else {
           return _errorToken();
@@ -397,7 +397,7 @@
 
 /** Static helper methods. */
 class TokenizerHelpers {
-  
+
   static bool isIdentifierStart(int c) {
     return ((c >= 97/*a*/ && c <= 122/*z*/) || (c >= 65/*A*/ && c <= 90/*Z*/) || c == 95/*_*/);
   }