Many type fixes.

lib/compiler/implementation/scanner/byte_strings.dart

Index: lib/compiler/implementation/scanner/byte_strings.dart
diff --git a/lib/compiler/implementation/scanner/byte_strings.dart b/lib/compiler/implementation/scanner/byte_strings.dart
index e6daab14eda03bc13210f2d1de1598bbc50ac29c..c9b18d0c83217775d85059563f49435ad4c57b26 100644
--- a/lib/compiler/implementation/scanner/byte_strings.dart
+++ b/lib/compiler/implementation/scanner/byte_strings.dart
@@ -47,6 +47,9 @@ class ByteString implements SourceString {
   }
 
   bool isEmpty() => length == 0;
+  bool isPrivate() => !isEmpty() && bytes[offset] === $_;
+
+  String get stringValue() => null;

[kasperl, 2012/04/16 13:10:46]

This seems broken. Why is the string value null?

[floitsch, 2012/04/16 13:57:57]

Peter asked me to return null.

[ahe, 2012/04/16 15:02:28]

Which is the correct thing to do. This method only returns something for tokens
that have a "static" string value (operators and keywords).

 }
 
 /**