Jim Porter <jporterbugs@gmail.com> writes:
> I believe this could be:
>
>   (or (run-hook-with-args-until-success
>        'eww-guess-content-type-functions headers response-buffer)
>       "text/plain")

TIL. I landed in seq-some looking for something like
run-hook-with-args-until-sucess. So I actually learned two days in a
row! :)

Attached a modified patch. I also noticed and corrected another error,
that broke things when using the "g" (reload) command.

As for testing, I used this:

(defun do-ask (headers response)
  (when (y-or-n-p "decide?")
    (if (y-or-n-p "render?")
        "text/html"
      "text/plain")))

(setq eww-guess-content-type-functions
      '(do-ask eww--html-if-doctype))

And then reverse the order of the functions. Using "regular"
pages and the one reported in the bug.
Also tested with no functions.