To add more confusion on the debate, look at this example:
;-)

        Objective Caml version 3.09.1

# type t = A of int * int;;
type t = A of int * int
# A 1 2;;
Syntax error
# `A 1 2;;
Syntax error
# #load "camlp4o.cma";;
        Camlp4 Parsing version 3.09.1

# A 1 2;;
Toplevel input:
# A 1 2;;
  ^^^^^
Parse error: currified constructor
# `A 1 2;;
- : [> `A of int * int ] = `A (1, 2)     (* !!!!! *)


(This is _not_ the revised syntax, but a strange bug/feature of camlp4o ...)