From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: Wrong number of arguments: setq, 1
Date: Fri, 11 Dec 2015 16:19:21 -0500
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Kaushal Modi <kaushal.modi@gmail.com> writes:

> ...
> Without these fixes, I get an error like: Wrong number of arguments: setq, 1
>

I don't. Version info:

Org-mode version 8.3.2 (release_8.3.2-380-g64aee4 @
/home/nick/elisp/org-mode/lisp/)

GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.15) of
2015-08-16 on alphaville.usersys.redhat.com

> I am not familiar with letrec but for let statements, if I want to set
> a let-bound variable X's value to nil, I would do,
>
> (let (X) ..)
>
> or
>
> (let ((X nil)) ..)
>
> But NOT (let ((X)) ..) (Note the parentheses count).
>
>
> Do the same rules not apply to letrec?

They do not: letrec takes a list, each element of which is
a list (SYMBOL VALUEFORM) - but afaik, an empty VALUEFORM
sets the SYMBOL to nil.

let takes a VARLIST, each element of which is a symbol *or* a
list (SYMBOL VALUEFORM).

See their docstrings.

>
> Here is my org-version:
>
> Org-mode version 8.3.2 (release_8.3.2-380-g64aee4 @
> /home/kmodi/usr_local/apps/6/emacs/emacs-25/share/emacs/site-lisp/org/)
>
> Here is my emacs build info (emacs-25 branch):
>
> Emacs version: GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, GTK+
> Version 2.24.23)
>  of 2015-12-10, built using commit d75849e937af0ecbcdc7bf621aa9bcd43aa75df4.
>

My org is the same as yours, but my emacs is a few months old: maybe
some recent change screwed up something.

--
Nick