Subject: bug#36988: 26.2; Error "Non-hex digit used for Unicode escape" is not too helpful

From: Lars Ingebrigtsen <[email-masked]>
Date: Fri, 23 Aug 2019 06:21:31 +0200

Drew Adams <[email-masked]> writes:

> emacs -Q
>
> Put this text in *scratch*, then move point to bob:
>
> "\u2"
>
> Then evaluate (read (current-buffer)).  You get this error:
>
> Debugger entered--Lisp error: (error "Non-hex digit used for Unicode escape")
>   read(#<buffer *scratch*>)
>   eval((read (current-buffer)) nil)
>   eval-expression((read (current-buffer)) nil nil 127)
>   funcall-interactively(eval-expression (read (current-buffer)) nil nil 127)
>   call-interactively(eval-expression nil nil)
>   command-execute(eval-expression)

[...]

> Perhaps there could be some way to point more or less to the offensive
> "Non-hex digit used for Unicode escape"?  In this case, the offense was
> apparently committed by the \u.

No, the quote mark.

I've now changed this error message to be a bit more helpful:

Non-hex character used for Unicode escape: " (34)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no