fixes #219, able to compile multiple entry points

lib/src/checker/rules.dart

 // Copyright (c) 2015, 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 dev_compiler.src.checker.rules;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 
 import 'package:dev_compiler/src/info.dart';
 import 'package:dev_compiler/src/utils.dart' as utils;
 import 'package:dev_compiler/strong_mode.dart' show StrongModeOptions;
 
 abstract class TypeRules {
   final TypeProvider provider;
-  LibraryInfo currentLibraryInfo = null;
 
   /// Map of fields / properties / methods on Object.
   final Map<String, DartType> objectMembers;
 
   TypeRules(TypeProvider provider)
       : provider = provider,
         objectMembers = utils.getObjectMemberMap(provider);
 
   MissingTypeReporter reportMissingType;
 
@@ skipping 749 matching lines @@
     var entries = e.entries;
     bool inferEntry(MapLiteralEntry entry) {
       return _inferExpression(entry.key, kType, errors) &&
           _inferExpression(entry.value, vType, errors);
     }
     var b = entries.every(inferEntry);
     if (b) annotateMapLiteral(e, targs);
     return b;
   }
 }