Complain about built-in identifiers.

pkg/compiler/lib/src/parser/element_listener.dart

Index: pkg/compiler/lib/src/parser/element_listener.dart
diff --git a/pkg/compiler/lib/src/parser/element_listener.dart b/pkg/compiler/lib/src/parser/element_listener.dart
index 0925a1c5ca100c04b4d61bd01d4bf6eeea05e0c6..777ab85a746261054ae6828a52e0adb0f10201c6 100644
--- a/pkg/compiler/lib/src/parser/element_listener.dart
+++ b/pkg/compiler/lib/src/parser/element_listener.dart
@@ -717,6 +717,16 @@ class ElementListener extends Listener {
       case ErrorKind.Unspecified:
         errorCode = MessageKind.GENERIC;
         break;
+
+      case ErrorKind.BuiltInIdentifierAsType:
+        errorCode = MessageKind.GENERIC;
+        arguments = {"text": "Can't use '${token.lexeme}' as a type."};
+        break;
+
+      case ErrorKind.BuiltInIdentifierInDeclaration:
+        errorCode = MessageKind.GENERIC;
+        arguments = {"text": "Can't use '${token.lexeme}' as a name here."};
+        break;
     }
     SourceSpan span = reporter.spanFromToken(token);
     reportError(span, errorCode, arguments);