Eli Zaretskii <eliz@gnu.org> writes:

>> I use cl-flet and (eval-when-compile (require 'cl-lib)).  I hope that is
>> ok.
>
> I'd prefer a simple internal function, or a lambda.

I went with the lambda, it is the more concise choice.

>> +      (buffer-string))))
>
> I think buffer-substring-no-properties would be better than
> buffer-string, as we don't need to copy any text properties, right?

Yes, indeed.  I fixed that too.

Regards,
Raffael