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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: master c7d2a0d: * lisp/emacs-lisp/benchmark.el (benchmark-run):
	Allow variable.
Date: Tue, 27 Mar 2018 15:50:42 -0400
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Stefan Monnier wrote:

>> (benchmark-run nil (setq m (1+ 0)))
>
> What's the intended meaning of this nil?

I assume nil means 1. Doesn't seem particularly sensible, but there you go.

Whatever happens, benchmark-run and benchmark-run-compiled should be
consistent.