Revert "remove unecessary fn call"

This reverts commit 7bf0b50.

Author: zth

compiler/ml/printtyp.ml

@@ -612,6 +612,7 @@ let remove_stdlib t =
 
 let rec tree_of_typexp sch ty =
   let ty = repr ty in
+  let ty = remove_stdlib ty in
   let px = proxy ty in
   if List.mem_assq px !names && not (List.memq px !delayed) then
     let mark = is_non_gen sch ty in