Allow error-recovery in top-level nodes.

dart/frog/leg/scanner/scanner_bench.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.
 
 #library('scanner_bench');
 #import('scannerlib.dart');
 #import('scanner_implementation.dart');
 #source('source_list.dart');
 
 /**
@@ skipping 59 matching lines @@
   static final String spaces = "                                              ";
 
   final String esc;
   final String up;
   final String clear;
   final int total;
   int ticks = 0;
 
   ProgressBar(int total) : this.escape(total, new String.fromCharCodes([27]));
 
-  ProgressBar.escape(this.total, int esc)
+  ProgressBar.escape(this.total, String esc)
     : esc = esc, up = "$esc[1A", clear = "$esc[K";
 
   void begin() {
     if (total > 10) {
       print("[$spaces] 0%");
       print("$up[${hashes.substring(0, ticks * spaces.length ~/ total)}");
     }
   }
 
   void tick() {
     if (total > 10 && ticks % 5 == 0) {
       print("$up$clear[$spaces] ${ticks * 100 ~/ total}%");
       print("$up[${hashes.substring(0, ticks * spaces.length ~/ total)}");
     }
     ++ticks;
   }
 
   void end() {
     if (total > 10) {
       print("$up$clear[$hashes] 100%");
     }
   }
 }