Support symbol literals.

sdk/lib/_internal/compiler/implementation/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.
 
 part of resolution;
 
 abstract class TreeElements {
   Element get currentElement;
   Set<Node> get superUses;
 
@@ skipping 2441 matching lines @@
   }
 
   visitLiteralString(LiteralString node) {
     world.registerInstantiatedClass(compiler.stringClass, mapping);
   }
 
   visitLiteralNull(LiteralNull node) {
     world.registerInstantiatedClass(compiler.nullClass, mapping);
   }
 
+  visitSymbolLiteral(SymbolLiteral node) {
+    world.registerInstantiatedClass(compiler.symbolClass, mapping);
+    world.registerStaticUse(compiler.symbolConstructor.declaration);
+    world.registerConstSymbol(node.nameString, mapping);
+  }
+
   visitStringJuxtaposition(StringJuxtaposition node) {
     world.registerInstantiatedClass(compiler.stringClass, mapping);
     node.visitChildren(this);
   }
 
   visitNodeList(NodeList node) {
     for (Link<Node> link = node.nodes; !link.isEmpty; link = link.tail) {
       visit(link.head);
     }
   }
@@ skipping 1596 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }