Found a reliable way of segfaulting Emacs, without using threads/FFI! https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25684 (last time my Emacs segfaulted was bad memory)
miniblog.
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If your Emacs is segfaulting, you can explicitly write to stderr when debugging, so you have trace information! This even works when you are running Emacs with a GUI.
(print "hello world" #'external-debugging-output)
