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Re: let-keywords?

From: Kevin Ryde
Subject: Re: let-keywords?
Date: Tue, 12 Dec 2006 10:35:17 +1100
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux)

Han-Wen Nienhuys <address@hidden> writes:
> I think that ice-9's let-keyword* macro is the thing that I've been
> looking for, but I haven't been able to work out how to use it. 

I think it goes like

        (let-keywords '(#:foo "hello" #:xyzzy "world") #t
                      ((foo  "default for foo")
                       (bar  "default for bar"))
          foo => "hello"
          bar => "default for bar"

"allow-other-keywords" is whether it's an error to have something
unknown like #:xyzzy in the args.

I think the "let-keywords*" variant allows the default for one
variable to use the value of a previous one.

        (let-keywords* '(#:foo 1 #:xyzzy 2) #t
                       ((foo  1)
                        (bar  (+ foo 2)))
          foo => 1
          bar => 3

Would those help for the manual, or can anyone think of more typical
or clearer samples?

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