id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	difficulty
221	defstruct could use compiler-syntax to speed up instance creation	felix winkelmann	felix winkelmann	"By defining a compiler-macro on the constructor, keyword arguments can be pre-parsed and the constructor call be replaced by a direct structure value construction. Since this is applicable to various procedures, a general library procedure might be handy:

(unit `eval`)

{{{
(parse-keyword-arguments ARGLIST KEYS+DEFAULTS K) -> FORM
}}}

where K is a procedure `TMPVARS -> BODY` that returns a body. `FORM` is then a `let*` form binding temporaries to keep the original evaluation order of the arguments. In case of an invalid keyword argument list (computed keyword, missing keyword argument, non-keyword in keyword position, etc.) `parse-keyword-arguments` returns `#f`.
"	enhancement	closed	not urgent at all		core libraries		wontfix	keywords eval compiler-syntax