Fix repltest

Author: odersky

compiler/test-resources/repl/i5218

@@ -3,4 +3,5 @@ val tuple: (Int, String, Long) = (1,2,3)
 scala> 0.0 *: tuple
 val res0: (Double, Int, String, Long) = (0.0,1,2,3)
 scala> tuple ++ tuple
-val res1: Int *: scala.Tuple.Concat[(String, Long), tuple.type] = (1,2,3,1,2,3)
+val res1: Int *: String *: Long *:
+  scala.Tuple.Concat[scala.Tuple$package.EmptyTuple.type, tuple.type] = (1,2,3,1,2,3)