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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/60594] std::function of a type with a declared (but not defined) return type fails to compile
Date: Wed, 19 Mar 2014 19:04:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60594

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Are you sure this is valid? Instantiating std::function (like most std::lib
templates) with an incomplete type is undefined behaviour. Is the function type
bar() complete if bar is not complete?