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Subject: Re: scm_defined_p(sym, env)
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-[ Tue, Aug 23, 2011 at 12:36:44PM +0100, Richard Shann ]----
> I have defined a function with one needed and one optional arg, using
> 
> scm_c_define_gsubr (name, 2, 0, 0, callback);

You mean :

scm_c_define_gsubr (name, 1, 1, 0, callback);

don't you ?