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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/102712] std::optional::operator* should assert on
 unset value
Date: Tue, 12 Oct 2021 16:04:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102712

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You mean like this one?

/usr/include/c++/11/optional:440: constexpr _Tp& std::_Optional_base_impl<_=
Tp,
_Dp>::_M_get() [with _Tp =3D int; _Dp =3D std::_Optional_base<int, true, tr=
ue>]:
Assertion 'this->_M_is_engaged()' failed.
Aborted (core dumped)

It's been there since r248099 more than four years ago.

Just compile with -D_GLIBCXX_ASSERTIONS=