How to use ~c with v parameter in (ice-9 format)?

Tomas Volf <[email protected]> Mon, 11 Nov 2024 00:39:02 +0100

Newsgroups	gmane.lisp.guile.user
Message-ID	<[email protected]>

Hello,

when reading the documentation for (ice-9 format), this part of
description of ~c caught my eye:

> If the charnum parameter is given then an argument is not taken but
> instead the character is (integer->char charnum) (see
> Characters). This can be used for instance to output characters given
> by their ASCII code.

I wanted to give it a try, so I took the example from documentation and
run it in a REPL.

--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> ,use (ice-9 format)
scheme@(guile-user)> (format #f "~65c")
;;; <stdin>:29:0: warning: "~65c": wrong number of `format' arguments: expected 1, got 0
$7 = "A"
--8<---------------cut here---------------end--------------->8---

So, it does indeed return "A", however is also prints a warning.  Am I
doing something wrong?  Or is the documentation out-dated and `charnum'
parameter should be used in a different way?

Have a nice day,
Tomas

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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