https://www.gnu.org/software/emacs/manual/eintr.html
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The slightly odd word, void-function, is designed to cover the way Emacs Lisp is implemented,
which is that when a symbol does not have a function de nition attached to it,
the place that should contain the instructions is void.
Symbols can have both a value and a function associated to them.
Run lisp expression: c-x c-e