Per kenzo of #emacs, bug also exists in build 27 on a mac

On Mon, May 28, 2018 at 7:33 PM, Dave Goel <deego3@gmail.com> wrote:

(require 'cl)

(mapcon 'identity (list nil nil nil)) => hangs

(emacs-version)

"GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
of 2017-09-12 on hullmann, modified by Debian"