bug#20280: 25.0.50; Auto revert mode appears to be non-functional

[Eli Zaretskii]

> From: Christopher Carpenter <mordocai@mordocai.net>
> Date: Wed, 08 Apr 2015 12:20:10 -0500
> 
> 
> M-x find-file /tmp/some-file
> M-x auto-revert-mode
> 
> **** IN A SEPARATE PROCESS CAUSE THE FILE TO CHANGE ***
> 
> Expected: Buffer automatically reverts
> Actual: Buffer shows a M in mode line signifying the file has changed,
> but does not revert.

I cannot reproduce this, with today's Git repository.

Does this happen in "emacs -Q"?
Does this happen with any file, or just with files in /tmp?

Could be Darwin-specific (I don't have access to such a system).