val a : a Typerep_lib__Std_internal.Typerep.t
val b : b Typerep_lib__Std_internal.Typerep.t
val c : c Typerep_lib__Std_internal.Typerep.t
val d : d Typerep_lib__Std_internal.Typerep.t
val typename_of_named : 'a Typerep_lib.Typename.t ‑> 'b Typerep_lib.Typename.t ‑> 'c Typerep_lib.Typename.t ‑> 'd Typerep_lib.Typename.t ‑> ('a, 'b, 'c, 'd) named Typerep_lib.Typename.t
val typename_of_t : t Typerep_lib.Typename.t