From: Chong Yidong <cyd@stupidchicken.com>
To: "Lennart Borgman \(gmail\)" <lennart.borgman@gmail.com>
Cc: Drew Adams <drew.adams@oracle.com>, emacs-devel@gnu.org
Subject: Re: print-circle and describe-variable
Date: Tue, 10 Apr 2007 12:13:16 -0400 [thread overview]
Message-ID: <87fy78yzqb.fsf@stupidchicken.com> (raw)
In-Reply-To: <461BAE37.9010208@gmail.com> (Lennart Borgman's message of "Tue\, 10 Apr 2007 17\:33\:11 +0200")
"Lennart Borgman (gmail)" <lennart.borgman@gmail.com> writes:
>>>> I think you are seeing: 1) the side-effect result of `prin1' printing,
>>>> followed by 2) the returned value, printed normally. (#1=(2) #1#) is the
>>>> former; ((2) (2)) is the latter.
>>> But it is the output of (prin1 (list toto toto)), isn't it?
>>
>> I'm not sure what you mean (by "it" and by "the output", for instance).
>>
>> During the invocation of `prin1', the `print-circle' binding is in effect,
>> so (#1=(2) #1#) is what is printed (by the side effect of `prin1').
>>
>> The binding is finished after the expression evaluation, and that is when
>> the command loop prints the value that is returned by the expression.
>> Printing of this value is thus done using the default value of
>> `print-circle', nil, so you see ((2) (2)).
>
> Yes, but the let binding is in effect when printing the second toto
> too, or? The argument to print1 is (list toto toto).
No, the second list is the result of the `eval-expression', and
print-circle is not in effect there.
Here is another example:
M-: (setq toto-list (let ((toto (list 2))) (list toto toto))) RET
M-: (insert (format "%s" (let ((print-circle t)) (prin1 toto-list)))) RET
=> ((2) (2))
M-: (let ((print-circle t)) (insert (format "%s" (prin1 toto-list)))) RET
=> (#1=(2) #1#)
next prev parent reply other threads:[~2007-04-10 16:13 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-07 0:54 print-circle and describe-variable Lennart Borgman (gmail)
2007-04-07 17:31 ` Richard Stallman
2007-04-09 0:15 ` Stefan Monnier
2007-04-09 1:00 ` Lennart Borgman (gmail)
2007-04-09 7:02 ` Eli Zaretskii
2007-04-09 9:06 ` Lennart Borgman (gmail)
2007-04-09 19:25 ` Stefan Monnier
2007-04-09 19:59 ` Lennart Borgman (gmail)
2007-04-09 23:08 ` Chong Yidong
2007-04-09 23:28 ` Lennart Borgman (gmail)
2007-04-09 23:43 ` Drew Adams
2007-04-10 0:01 ` Lennart Borgman (gmail)
2007-04-10 15:02 ` Drew Adams
2007-04-10 15:33 ` Lennart Borgman (gmail)
2007-04-10 15:50 ` Drew Adams
2007-04-10 16:32 ` Lennart Borgman (gmail)
2007-04-10 16:13 ` Chong Yidong [this message]
2007-04-10 1:00 ` Miles Bader
2007-04-10 2:21 ` Richard Stallman
2007-04-10 2:35 ` Chong Yidong
2007-04-11 4:14 ` Richard Matthew Stallman
2007-04-11 5:16 ` Chong Yidong
2007-04-11 23:04 ` Richard Matthew Stallman
2007-04-12 9:29 ` Kim F. Storm
2007-04-13 1:41 ` Richard Stallman
2007-05-11 16:33 ` Herbert Euler
2007-04-09 22:52 ` Richard Stallman
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