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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: trunk r115491: Avoid undefined behavior with huge regexp interval
	counts.
Date: Thu, 12 Dec 2013 16:03:34 -0500
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This change causes things like

  (looking-at "a\\{2,\\}")

to fail with

  (invalid-regexp "Invalid content of \\{\\}")

See eg http://hydra.nixos.org/build/7147280