This is still an issue it seems.

Offending line is a call to url-insert-buffer-contents at 1171 in
lisp/emacs-lisp/package.el. I inserted a (require 'url-handlers) as you
mentioned and it seems to be working for me.

I have also been able to verify that I am not able to install packages
using list-packages with this bug.

On Mon, Nov 16, 2015 at 2:59 AM, Cesar Quiroz <cesar.quiroz@gmail.com>
wrote:

> Maybe just needs to be made autoloadable, like its file-contents sibling?
>
> This function was just introduced at commit
>
> 7cc233e1e3da297882c006c1f07c628fbd4e94d5
>
> Trigger the error by starting emacs and saying M-x list-packages.
> Work around it by (load-library "url-handlers") or equivalent.
>
>
> --César
>
> You can run the command ‘list-packages’ with M-x l-pac RET
> error in process filter: Symbol’s function definition is void:
> url-insert-buffer-contents [4 times]
> Package refresh done
> error in process filter: Symbol’s function definition is void:
> url-insert-buffer-contents [2 times]
>