fasta scanner recovery and error code translation improvements

pkg/front_end/lib/src/fasta/parser/token_stream_rewriter.dart

Index: pkg/front_end/lib/src/fasta/parser/token_stream_rewriter.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/token_stream_rewriter.dart b/pkg/front_end/lib/src/fasta/parser/token_stream_rewriter.dart
index 19955738e354e0261f236d139de9f5001078e31a..ead6e806508075a39bde64b7cc5e8a15878a0ccb 100644
--- a/pkg/front_end/lib/src/fasta/parser/token_stream_rewriter.dart
+++ b/pkg/front_end/lib/src/fasta/parser/token_stream_rewriter.dart
@@ -28,7 +28,7 @@ class TokenStreamRewriter {
   /// stream whose first token is [firstToken].
   TokenStreamRewriter(Token firstToken)
       : _head = firstToken.previousToken ??
-            (new SymbolToken(EOF_INFO, -1)..next = firstToken);
+            (new SymbolToken.eof(-1)..next = firstToken);
 
   /// Gets the first token in the stream (which may not be the same token that
   /// was passed to the constructor, if something was inserted before it).