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Re: [Chicken-users] Protect against mutation

From: Christian Kellermann
Subject: Re: [Chicken-users] Protect against mutation
Date: Sat, 27 Dec 2014 15:00:15 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

* Bahman Movaqar <address@hidden> [141227 13:51]:
> Consider the following snippet:
>  (use srfi-1)
>  (define (mutator lis n) (set! (first lis) n) lis)
>  (define ll (list 1 2 3 4))
>  (mutator (cdr lis) 100)
>  (equal? (second? lis) 100) --> #t
> Is there anyway to protect "lis" from mutation? TIA,

No, you would need immutable list objects, which an egg provides



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