Philipp Stephani <p.stephani2@gmail.com> schrieb am Mi., 9. Nov. 2016 um
22:11 Uhr:

>
> emacs -Q
>
> In *scratch*, evaluate:
>
> (funcall
>  (let ((lexical-binding t))
>    (byte-compile
>     (lambda (&optional a b)
>       (list a b))))
>  'a 'b)
>
> Result is (a b), as expected.  Now evaluate
>
> (funcall
>  (let ((lexical-binding t))
>    (byte-compile
>     (lambda (&optional a &optional b)
>       (list a b))))
>  'a 'b)
>
> Result is (b nil).
>
> Emacs should either generate correct code in both cases, or signal an
> error in the latter case.
>
> Fixed with commit  0d913da15c094bf596dd685acecf3438228c15cf.