Fix bug 1557

runtime/vm/scanner.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/scanner.h"
 
 #include "platform/assert.h"
 #include "vm/flags.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 365 matching lines @@
 
 void Scanner::ScanLibraryTag() {
   ReadChar();
   if (c0_ == '!') {
     Recognize(Token::kSCRIPTTAG);
     // The script tag extends to the end of the line. Just treat this
     // similar to a line comment.
     SkipLine();
     return;
   }
-  if (!IsIdentStartChar(c0_)) {
+  if (!IsLetter(c0_)) {
     ErrorMsg("Unrecognized library tag");
     SkipLine();
     return;
   }
   const String& kLibrary = String::Handle(String::NewSymbol("library"));
   const String& kImport = String::Handle(String::NewSymbol("import"));
   const String& kSource = String::Handle(String::NewSymbol("source"));
   const String& kResource = String::Handle(String::NewSymbol("resource"));
   const String& ident = String::Handle(ConsumeIdentChars(false));
   if (ident.Equals(kLibrary)) {
@@ skipping 514 matching lines @@
               "%c%"PRIxPTR, kPrivateKeySeparator, key_value);
   const String& result = String::Handle(String::New(private_key));
   return result.raw();
 }
 
 
 void Scanner::InitOnce() {
 }
 
 }  // namespace dart