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Re: print-circle and describe-variable
From: |
Chong Yidong |
Subject: |
Re: print-circle and describe-variable |
Date: |
Tue, 10 Apr 2007 12:13:16 -0400 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.97 (gnu/linux) |
"Lennart Borgman (gmail)" <address@hidden> 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#)
- Re: print-circle and describe-variable, (continued)
- Re: print-circle and describe-variable, Stefan Monnier, 2007/04/09
- Re: print-circle and describe-variable, Lennart Borgman (gmail), 2007/04/09
- Re: print-circle and describe-variable, Chong Yidong, 2007/04/09
- Re: print-circle and describe-variable, Lennart Borgman (gmail), 2007/04/09
- RE: print-circle and describe-variable, Drew Adams, 2007/04/09
- Re: print-circle and describe-variable, Lennart Borgman (gmail), 2007/04/09
- RE: print-circle and describe-variable, Drew Adams, 2007/04/10
- Re: print-circle and describe-variable, Lennart Borgman (gmail), 2007/04/10
- RE: print-circle and describe-variable, Drew Adams, 2007/04/10
- Re: print-circle and describe-variable, Lennart Borgman (gmail), 2007/04/10
- Re: print-circle and describe-variable,
Chong Yidong <=
- Re: print-circle and describe-variable, Miles Bader, 2007/04/09
- Re: print-circle and describe-variable, Richard Stallman, 2007/04/09
- Re: print-circle and describe-variable, Chong Yidong, 2007/04/09
- Re: print-circle and describe-variable, Richard Matthew Stallman, 2007/04/11
- Re: print-circle and describe-variable, Chong Yidong, 2007/04/11
- Re: print-circle and describe-variable, Richard Matthew Stallman, 2007/04/11
- Re: print-circle and describe-variable, Kim F. Storm, 2007/04/12
- Re: print-circle and describe-variable, Richard Stallman, 2007/04/12
- Re: print-circle and describe-variable, Richard Stallman, 2007/04/09