We don't need to build enums.

pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/context/context.dart';
@@ skipping 308 matching lines @@
     }
 
     new DeclarationResolver().resolve(unit, unitElement);
 
     if (file == library) {
       // TODO(scheglov) fill these maps?
       DirectiveResolver resolver = new DirectiveResolver({}, {}, {});
       unit.accept(resolver);
     }
 
-    unit.accept(new EnumMemberBuilder(typeProvider));
+    // TODO(scheglov) remove EnumMemberBuilder class
 
     new TypeParameterBoundsResolver(
             typeProvider, libraryElement, unitElement.source, errorListener)
         .resolveTypeBounds(unit);
 
     unit.accept(new TypeResolverVisitor(
         libraryElement, unitElement.source, typeProvider, errorListener));
 
     LibraryScope libraryScope = new LibraryScope(libraryElement);
     unit.accept(new VariableResolverVisitor(
@@ skipping 223 matching lines @@
   @override
   String setContents(Source source, String contents) {
     throw new UnimplementedError();
   }
 
   FileState _getFileForSource(Source source) {
     String path = source.fullName;
     return fsState.getFileForPath(path);
   }
 }