Update i17186.scala

Author: Decel

tests/pos/i17186.scala

@@ -1,5 +1,5 @@
-type Second[X <: Tuple2[Any, Any]] = Tuple.Head[Tuple.Tail[X]]
+type SecondOfTwo[X <: Tuple2[Any, Any]] = Tuple.Head[Tuple.Tail[X]]
 val a = implicitly[Second[Tuple2[Int, String]] =:= String]
 
-type Middle[X <: Tuple2[Any, Any]] = Tuple.Tail[Tuple.Tail[X]]
-val b = implicitly[Middle[Tuple2[Int, String]] =:= EmptyTuple]
+type LastOfThree[X <: Tuple3[Any, Any, Any]] = Tuple.Tail[Tuple.Tail[X]]
+val b = implicitly[LastOfThree[Tuple3[Int, String, Boolean]] =:= Tuple1[Boolean]]