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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/97740] [10/11/12/13 Regression] Weird error message about
 accessing a private member of my own class inside of std::string_view inside
 of constexpr
Date: Fri, 24 Mar 2023 16:08:25 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ppalka at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97740

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |10.5
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D96716
            Summary|Weird error message about   |[10/11/12/13 Regression]
                   |accessing a private member  |Weird error message about
                   |of my own class inside of   |accessing a private member
                   |std::string_view inside of  |of my own class inside of
                   |constexpr                   |std::string_view inside of
                   |                            |constexpr
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |ppalka at gcc dot gnu.org

--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Here's a reduced C++11 testcase that became rejects-valid after
r10-6416-g8fda2c274ac66d:

struct A {
  constexpr const int* get() const { return &m; }
private:
  int m =3D 42;
} a;

struct B { const int* p; };

template<class>
void f() {
  constexpr B b =3D {a.get()};
}

template void f<int>();

<stdin>: In function =E2=80=98void f()=E2=80=99:
<stdin>:11:25: error: =E2=80=98int A::m=E2=80=99 is private within this con=
text
<stdin>:4:7: note: declared private here
<stdin>: In instantiation of =E2=80=98void f() [with <template-parameter-1-=
1> =3D int]=E2=80=99:
<stdin>:14:22:   required from here
<stdin>:11:25: error: =E2=80=98int A::m=E2=80=99 is private within this con=
text
<stdin>:4:7: note: declared private here=