Dear all,

This is a rather minor issue, but I was surprised by the following answers
of the interpreter:

        OCaml version 4.00.1

# ignore succ;;
Warning 5: this function application is partial,
maybe some arguments are missing.
- : unit = ()
# (fun _ -> ()) succ;;
- : unit = ()

I naively used to think the two expressions were equivalent. Reading
pervasives.mli, I found that ignore is a primitive:

external ignore : 'a -> unit = "%ignore"

which means it is treated as a special case. Just for curiosity, what is
the rationale for the warning in the first case?

Cheers,
  Philippe.