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Re: Newbie Conditional Problem
From: |
David Kastrup |
Subject: |
Re: Newbie Conditional Problem |
Date: |
17 Jan 2003 17:52:57 +0100 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 |
"CarlC" <carlc@snowbd.com> writes:
> "David Kastrup" <dak@gnu.org> wrote in message
> x54r87zrdo.fsf@lola.goethe.zz">news:x54r87zrdo.fsf@lola.goethe.zz...
> > Well, what do you expect? (goto-line line) is no function, and you
> > use it in the place of one, namely immediately after an opening
>
> C-f h goto-line RET shows:
>
> goto-line is an interactive compiled Lisp function in `simple'.
See? goto-line is a function. (goto-line line) is a function call.
> (goto-line ARG)
This is supposed to illustrate how goto-line is called. A function
call is not the same as a function.
> Goto line ARG, counting from line 1 at beginning of buffer.
>
> I am new to this. Is it technically a command or function? Can it be
> used immediatly after an opening parenthesis?
goto-line is a function. It can be "used" immediately after an
opening parenthesis. This is not what Emacs complained about. Emacs
complained about using (goto-line line) after an opening
parenthesis. (goto-line line) is not a function, it is a function
call.
> It seems to work fine outside of this conditional.
No, it doesn't. (goto-line line) will work fine.
((goto-line line) ...) will not.
> I can put other commands in the conditional and they fail, also.
You don't put them in the conditional. You put them in the
function call place of a function that you want to have as the body
of the conditional.
> > parenthesis of a non-special form. I recommend that you instead use
> > progn after the opening parenthesis. Look it up with
> >
> > C-h f progn RET
>
> progn is a special form.
> (progn BODY ...)
>
> Eval BODY forms sequentially and return value of last one.
>
> This doesn't tell me a whole lot. I get an invalid function using progn,
> also. Is it a function?
(progn (goto-line line) (goto-line line))
would be a valid form.
((goto-line line) (goto-line line))
isn't, and because of the first function call in it which is used as
if it were a function.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
- Re: Newbie Conditional Problem, (continued)
Re: Newbie Conditional Problem, Brendan Halpin, 2003/01/17
Re: Newbie Conditional Problem, David Kastrup, 2003/01/17
Re: Newbie Conditional Problem, Stefan Monnier <address@hidden>, 2003/01/17
Re: Newbie Conditional Problem, Kai Großjohann, 2003/01/18