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Number of arguments ?

Hello,

I'd like to know if there is a means to know how many arguments is
expecting a function, from a SCM object in C code.

Something like int gh_numargs(SCM proc).

Thanks.
-- 
Etienne BERNARD   ISIA, Mines de Paris / Ecole Centrale Paris, France.
E-Mail : eb@via.ecp.fr    WWW : http://www.via.ecp.fr/~eb/    IRC : eb