when using camlp4 in the toplevel (3.10) :

#use "topfind";;
#camlp4o;;

then loading a sourcefile:

#use "tst.ml";;

it works. When loading it a second time:

#use "tst.ml";;

it gives:
I/O error: Bad file descriptor

without camlp4 reloading works endlessly :-)
Is there a reason for this?

cheers
 Michael