23.0.60; error "Invalid face slant" roman

[Dan Kruchinin]

Dan Kruchinin wrote:
> Hello.
>
> After I customize default font using set-default-font and customize 
> default face using custom-set-faces I get an error:
> internal-set-lisp-face-attribute(default :slant roman #<frame 
> address@hidden 0xf46800>).
> This problem can be reproduced in the following way:
> ----
> (when window-system
>  (set-default-font "DejaVu Sans Mono-8"))
>
> (custom-set-faces
>   '(default ((t (:foreground "lightgray" :background "black")))))
> ----

Quite interesting: if I make (custom-set-faces '(default ((t 
(:foreground "lightgray" :background "black")))))  *first* and *then* 
change default face
I don't get described earlier error.

W.B.R.
Dan Kruchinin