[plt-scheme] keyword arguments (in v4.0, maybe)

On Jun 13, Matthew Flatt wrote:
> At Tue, 12 Jun 2007 18:23:19 -0500, "Robby Findler" wrote:
> > I guess that only having optional keyword arguments would be strange
> > (and would lead to endless "why don't you have ..." questions on
> > mailing lists like this one ;).
> 
> I don't know. That might be a fine point in the design space.
> 
> In my use of `lambda/kw', I have wished for a form that made keywords
> required, in the sense that failing to provide a keyword argument in an
> application would trigger an exception. Simply making the default
> default-value expression raise an exception, though, would have been
> good enough for my purposes.
> 
> It would simplify `procedure?', `procedure-arity', and
> keyword-procedure-arity', and eliminate the need for
> `keyword-procedure?'.

(How?)

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