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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/55713] std::tuple<ElementType> incorrectly is convertible to "ElementType" when it is an empty class
Date: Sun, 16 Dec 2012 17:49:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55713

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-12-16 17:49:20 UTC ---
This was done for an optimization. And I think it is allowed by the C++
standard too.