From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Bavier <ericbavier@openmailbox.org>
Subject: Re: Adding wc to Bournish
Date: Fri, 27 May 2016 08:37:49 -0500
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To: Efraim Flashner <efraim@flashner.co.il>
Cc: guix-devel@gnu.org

On 2016-05-26 14:27, Efraim Flashner wrote:
> Here's where I'm currently at with 'wc'. Currently I'm getting an error
> about having the wrong number of arguments for lambda (I assume)
[...]
> +(define (wc-command file)
> +  ((lambda (lines words chars) ; lambda doesn't like 3 variables
> +     (format #t "~a ~a ~a ~a~%" lines words chars file))
> +   (call-with-input-file file lines+chars)))
[...]
> 
> ;;; /home/efraim/workspace/guix/guix/build/bournish.scm:143:2: warning:
> wrong number of arguments to `#<tree-il (lambda () (lambda-case 
> (((lines
> words chars) #f #f #f () (lines-24244 words-24245 chars-24246)) (apply
> (toplevel format) (const #t) (const "~a ~a ~a ~a~%") (lexical lines
> lines-24244) (lexical words words-24245) (lexical chars chars-24246)
> (lexical file file-24242)))))>'

I think you might just be missing a 'call-with-values':

(define (wc-command file)
   (call-with-values
     (call-with-input-file file lines+chars)
     (lambda (lines words chars) ...)))

-- 
`~Eric