I was tinkering with my .emacs file, trying to use different use-package
idioms, when I noticed that Emacs segfaults when I attempt to compile my
.emacs, when ack-and-a-half is not installed.

First, the debugger is raised, then Emacs crashes when I try to kill the
debugger buffer.

Config:

https://github.com/mcandre/dotfiles/blob/6e669baf064803339f434e30e61ef97f8d1d315d/.emacs

-- 
Cheers,
Andrew