Fix for antlr#4320--Add missing types to export for Dart runtime.

runtime/Dart/lib/antlr4.dart

@@ -8,20 +8,24 @@ library antlr4;
 
 export 'src/atn/atn.dart';
 export 'src/dfa/dfa.dart';
-export 'src/tree/tree.dart';
 export 'src/error/error.dart';
-export 'src/rule_context.dart';
+export 'src/misc/misc.dart';
+export 'src/tree/tree.dart';
+
 export 'src/input_stream.dart';
-export 'src/token_stream.dart';
+export 'src/interval_set.dart';
 export 'src/lexer.dart';
 export 'src/parser.dart';
 export 'src/parser_rule_context.dart';
-export 'src/vocabulary.dart';
-export 'src/runtime_meta_data.dart';
-export 'src/token.dart';
 export 'src/prediction_context.dart';
 export 'src/recognizer.dart';
-export 'src/interval_set.dart';
+export 'src/rule_context.dart';
+export 'src/runtime_meta_data.dart';
+export 'src/token.dart';
+export 'src/token_factory.dart';
+export 'src/token_source.dart';
+export 'src/token_stream.dart';
+export 'src/vocabulary.dart';
 
 import 'src/util/platform_stub.dart'
     if (dart.library.io) 'src/util/platform_io.dart';

runtime/Dart/lib/src/misc/misc.dart

@@ -0,0 +1,8 @@
+/*
+ * Copyright (c) 2012-2023 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+export 'src/multi_map.dart';
+export 'src/pair.dart';