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From: Eric McDonald <mcdonald@phy.cmich.edu>
To: guile-user@gnu.org
Subject: Re: Interesting Behavior of 'append!' In Local Context
Date: Sat, 17 Oct 2009 20:36:41 -0400	[thread overview]
Message-ID: <4ADA6319.1030004@phy.cmich.edu> (raw)
In-Reply-To: <2F77A419-E28E-4936-854C-5FAE76D85815@member.fsf.org>

Stephen Compall wrote:

> Literals are literally literal.  That is to say:
> 
> (define (itsaliteral) '(42 42))

Thanks, Stephen. I never really looked at quote as declaring a literal.
I primarily saw its use for suppressing evaluation inside the quoted
entity, and as a convenient shorthand for making lists. I guess it's a
convenient shorthand for making _literal_ lists. (And, the Guile
documentation even uses the word literal - now that I'm looking for it. ;-)

> It is an error to modify literals, but it is also not required by R5RS
> to detect and inform of such erroneous modification.  It is, however,

Fair enough. I certainly wouldn't mind seeing "detect and inform"
implemented for this case. As a comparison: if I'm writing C or C++
code, and I try to modify a const value, the compiler is generally going
to let me know.

Anyway, sorry to trouble the list with a noobish oversight.

Regards,
  Eric





  reply	other threads:[~2009-10-18  0:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-10-17 22:28 Interesting Behavior of 'append!' In Local Context Eric McDonald
2009-10-17 23:09 ` Stephen Compall
2009-10-18  0:36   ` Eric McDonald [this message]
2009-10-18  1:45     ` Stephen Compall
2009-10-18 13:53       ` Eric McDonald
2009-10-18 10:25     ` Andy Wingo

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