Handle const Symbol(...) in closed_world2_test

pkg/compiler/lib/src/resolution/members.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 dart2js.resolution.members;
 
 import '../common.dart';
 import '../common/names.dart' show Selectors;
 import '../common/resolution.dart' show Resolution;
 import '../compile_time_constants.dart';
@@ skipping 3822 matching lines @@
     sendIsMemberAccess = oldSendIsMemberAccess;
     if (result.kind == ResultKind.CONSTANT) {
       return result;
     }
     return const NoneResult();
   }
 
   ResolutionResult visitNewExpression(NewExpression node) {
     ConstructorResult result = resolveConstructor(node);
     ConstructorElement constructor = result.element;
+    if (resolution.commonElements.isSymbolConstructor(constructor)) {
+      registry.registerFeature(Feature.SYMBOL_CONSTRUCTOR);
+    }
     ArgumentsResult argumentsResult;
     if (node.isConst) {
       argumentsResult =
           inConstantContext(() => resolveArguments(node.send.argumentsNode));
     } else {
       argumentsResult = resolveArguments(node.send.argumentsNode);
     }
     // TODO(johnniwinther): Avoid the need for a [Selector].
     Selector selector = resolveSelector(node.send, constructor);
     CallStructure callStructure = selector.callStructure;
@@ skipping 944 matching lines @@
     }
     return const NoneResult();
   }
 }
 
 /// Looks up [name] in [scope] and unwraps the result.
 Element lookupInScope(
     DiagnosticReporter reporter, Node node, Scope scope, String name) {
   return Elements.unwrap(scope.lookup(name), reporter, node);
 }