[plt-scheme] Recognising primitive procedures

Ciao,

I am using "scheme_make_closed_prim_w_arity()": I wonder if
there is a way to recognise the primitive procedure's
Scheme_Object
as one that my library has created, when the procedure is used
as argument of another primitive procedure.

The only way I can think of is to use the closed prims as keys
for a hash table that has the custom data as values. Not so
beautiful...

TIA
-- 
Marco Maggi

"Now feel the funk blast!"
Rage Against the Machine - "Calm like a bomb"