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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103403] [11/12 Regression] auto return type with a trailing
 return type of decl(auto) uses rvalue reference type instead of
 reference type
Date: Wed, 24 Nov 2021 09:59:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103403

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |11.3
     Ever confirmed|0                           |1
      Known to fail|                            |11.1.0
            Summary|Decltype of rvalue          |[11/12 Regression] auto
                   |reference                   |return type with a trailing
                   |                            |return type of decl(auto)
                   |                            |uses rvalue reference type
                   |                            |instead of reference type
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |10.1.0, 10.3.0, 7.1.0
   Last reconfirmed|                            |2021-11-24

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is a C++14 testcase which shows this is also a regression:
template<typename T>
auto constexpr RtoL1(T&& r) -> decltype(auto) {
    return (r);
};
int main() {
    int t;
    int x{3};
    decltype (RtoL1(x+0)) y =3D t;
}

Confirmed.=