IMHO, to run ocaml toplevel with pipes (like ocaml2) is not a good idea.
This program can't distinguish between toplevel output and user script
output.
For example:
print_string "xxx# "; flush stdout ; ignore (input_line stdin);;

Standard toplevel can not hook line input (Toploop.refill_lexbuf).
I made patch to fix this problem and also I made a simple toplevel which
uses getline lib (based on ocaml2 code).
http://wtk.ru/pm/fp/caml/iocaml.tgz

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