Subject: bug#354: "Added (how many lines, bytes?!) to file.txt"

From: Paul Eggert <[email-masked]>
Date: Sun, 2 Apr 2017 11:24:30 -0700

On 04/01/2017 08:55 PM, [email-masked] wrote:
> +           (build_string ("%s %d characters of `%s'"),
> +            build_string (NUMBERP (append) ? "Updated"
> +                          : ! NILP (append) ? "Added"
> +                          : "Wrote"),

This should use AUTO_STRING instead of build_string. Also, follow the 
old code and use just one string (a format) instead of two, as it's more 
important to use idiomatic English than to save a few bytes in the Emacs 
executable.