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Fwd: new function

From: Damien Mattei
Subject: Fwd: new function
Date: Sun, 19 Sep 2021 11:18:23 +0200

---------- Forwarded message ---------
From: Damien Mattei <>
Date: Sun, Sep 19, 2021 at 9:54 AM
Subject: new function
To: <>

i'm developing an extension to Scheme
and i need a procedure or macro that define a variable only if it is not
bind and if it is just set! it.

I can not do it in Guile or any Scheme,and i'm desperately searching a way
to do that. I finally conclude that it can be done only by adding it in the

Can someone include a such function in Guile next release?
i know guile have a predicate defined? to test binfing of a vairable but
writing a macro with it is not possible because define can be used in an
expression context.

Thank in advance for any help

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