id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc
866,boa constructor supplied-p argument,rme,,"From pro@common-lisp.net:

I tried to save a supplied-p parameter from a BOA constructor like this:
{{{
(defstruct (delayed-iseq
            (:constructor iseq (start-or-end 
                                &optional (end 0 end?) (by 1)
                                strict-direction?)))
 ""Delayed index sequence evaluation.""
 start-or-end end end? by strict-direction?)
}}}

but SBCL complained that end? was not used.  After rereading the CLHS
page for defstruct, I am still not 100% sure why this is.  My
intepretation is that END? is an argument like any other, but probably I
am not getting something.
",defect,closed,normal,,Compiler,trunk,invalid,,