Support symbol literals.

sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart

Index: sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
diff --git a/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart b/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
index e835be074bad7b720823edd50d017799c647c312..1c37fa507d7fe0cb8c798e419af4740138644228 100644
--- a/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
+++ b/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
@@ -638,6 +638,10 @@ abstract class InferrerVisitor
     return types.nullType;
   }
 
+  T visitLiteralSymbol(LiteralSymbol node) {
+    return types.nonNullExact(compiler.symbolClass.rawType);

[ngeoffray, 2013/09/04 07:14:17]

Please change this to actually use types.symbolType and have the backend tell
you what is the symbol class implementation.

+  }
+
   T visitTypeReferenceSend(Send node) {
     return types.typeType;
   }