From: John Croisant <address@hidden>
Subject: [Chicken-users] Bug with #!optional in Chicken 4.8.0
Date: Sat, 13 Oct 2012 20:34:26 -0400
In Chicken 4.8.0, procedures defined with #!optional no longer signal
an exception if invoked with too many arguments. For example:
(define (foo x #!optional y) (list x y))
(foo 'x 'y 'too 'many 'args)
In Chicken 4.7, this would signal an exception, because the foo
procedure expects a maximum of 2 arguments. In Chicken 4.8, the extra
arguments are simply ignored.
I think this is a bug, because the docs for "Extended DSSSL style
lambda lists" say:
If there is no rest-parameter and no keyword-parameters in the
parameter-list, then it shall be an error for any extra arguments to
be passed to the procedure.
That is correct. The check has been removed and conflicts with
the documentation. I will update the docs accordingly.
The check has been removed to accomodate a terrible hack for handling
re-initialization of parameters with "parameterize", and for a slight
performance win. The hack is so terrible, I hardly dare to talk about
it in public.