From: Nikita Karetnikov <nikita@karetnikov.org>
To: Mark H Weaver <mhw@netris.org>
Cc: 14164@debbugs.gnu.org
Subject: bug#14164: letrec: detect illegal accesses to vars before entering body
Date: Tue, 09 Apr 2013 10:37:38 +0400 [thread overview]
Message-ID: <87mwt8p5u5.fsf@karetnikov.org> (raw)
In-Reply-To: <87bo9oe14d.fsf@tines.lan> (Mark H. Weaver's message of "Tue, 09 Apr 2013 01:14:58 -0400")
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>> According to the manual [1], this snippet:
>>
>> (letrec ((a 42)
>> (b (+ a 10)))
>> (* a b))
>>
>> should return "Error: unbound variable: a."
> The manual doesn't say anything nearly that specific.
Either you missed it or I misunderstood this sentence. So if you missed
it, it can be found below 'syntax: letrec* bindings body'.
> In general, if the manual says you "may not" do something, or if the
> R5RS says "it is an error", that means that if you do, the results are
> unspecified.
Are you talking about the result of 'letrec' or 'b'? Anyway, why does
it return 2184 if the results are unspecified? Could you elaborate?
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next prev parent reply other threads:[~2013-04-09 6:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-09 4:41 bug#14164: 'letrec' allows to refer to the values of previously bound variables Nikita Karetnikov
2013-04-09 5:14 ` bug#14164: letrec: detect illegal accesses to vars before entering body Mark H Weaver
2013-04-09 6:37 ` Nikita Karetnikov [this message]
2013-04-09 16:44 ` Mark H Weaver
2013-04-09 17:22 ` Nikita Karetnikov
2013-04-10 9:25 ` Mark H Weaver
2013-04-12 8:43 ` Ludovic Courtès
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