Add top level type inference logic for integer literals.

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

 // 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.
 
 library fasta.parser.parser;
 
 import '../fasta_codes.dart'
     show
         FastaCode,
         FastaMessage,
@@ skipping 1601 matching lines @@
       }
     }
     return listener.handleMemberName(const Link<Token>());
   }
 
   Token parseFieldInitializerOpt(Token token) {
     if (optional('=', token)) {
       Token assignment = token;
       listener.beginFieldInitializer(token);
       token = parseExpression(token.next);
-      listener.endFieldInitializer(assignment);
+      listener.endFieldInitializer(assignment, token);
     } else {
       listener.handleNoFieldInitializer(token);
     }
     return token;
   }
 
   Token parseVariableInitializerOpt(Token token) {
     if (optional('=', token)) {
       Token assignment = token;
       listener.beginVariableInitializer(token);
@@ skipping 2272 matching lines @@
     return reportUnrecoverableError(
         token, () => code.format(uri, token.charOffset, string));
   }
 }
 
 typedef FastaMessage NoArgument(Uri uri, int charOffset);
 
 typedef FastaMessage TokenArgument(Uri uri, int charOffset, Token token);
 
 typedef FastaMessage StringArgument(Uri uri, int charOffset, String string);