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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++/64399] g++ does not diagnose when upcasting owning pointer (e.g. unique_ptr) with non-virtual destructor
Date: Wed, 24 Dec 2014 08:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64399

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It might be valid with a custom deleter, but the example shown has undefined
behaviour.