Thank you Olivier,

That seemed to solve my problem. Much appreciated. Now on to the real
deal.

Regards,
Lars Nilsson

Olivier Andrieu writes:
 > You're using CAMLparam macros to register the arguments in the GC but
 > then you're not using CAMLreturn.
 > 
 >  > CAMLprim value helper_doit()
 >  > {
 >  >      CAMLparam0();
 >  > 
 >  >      callback2(closure_fun, copy_string("foo"), closure_data);
 >  > 
 >         CAMLreturn(Val_unit);
 > 
 >  > }
 > 
 > (same thing for the other function).
 > 
 > -- 
 >    Olivier
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