Sorry if this submission is irrelevant to the list, but I failed to
locate
more appropriate place for it.

    Given the file t.ml with the single line

                    () (let module X = Y in ())

   camlp5 behaves as shown below:

                   camlp5o t.ml >  /dev/null ---- ok
                   camlp5o pr_o.cmo t.ml > /dev/null --- Failure: unable
to print expr

    Best regards,
    Dmitri Boulytchev,
    St.Petersburg State University,
    St.Petersburg, Russia