fasta scanner recovery and error code translation improvements

pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart

Index: pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
diff --git a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
index 15f7afd0be5cc0cf8a22bfc9e0bf8dadcd030eeb..6d30d44b6b38441739788e18d2c85f291ac479bb 100644
--- a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
+++ b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
@@ -104,7 +104,8 @@ abstract class TokenStreamRewriterTest {
   ///
   /// The EOF token is returned.
   Token _link(Iterable<Token> tokens) {
-    Token head = new SymbolToken(EOF_INFO, -1);
+    Token head = new SymbolToken.eof(-1);
+    if (!setPrevious) head.previousToken = null;
     for (var token in tokens) {
       head.next = token;
       if (setPrevious) token.previousToken = head;
@@ -112,7 +113,8 @@ abstract class TokenStreamRewriterTest {
     }
     int eofOffset = head.charOffset + head.lexeme.length;
     if (eofOffset < 0) eofOffset = 0;
-    Token eof = new SymbolToken(EOF_INFO, eofOffset);
+    Token eof = new SymbolToken.eof(eofOffset);
+    if (!setPrevious) eof.previousToken = null;
     head.next = eof;
     if (setPrevious) eof.previousToken = head;
     return eof;