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From: "herring at lanl dot gov" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108759] New: "mandatory copy elision" not implemented
 during constant evaluation redux
Date: Sat, 11 Feb 2023 05:49:00 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108759

            Bug ID: 108759
           Summary: "mandatory copy elision" not implemented during
                    constant evaluation redux
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: herring at lanl dot gov
  Target Milestone: ---

Extending the test case in (the invalid) #94537 to have a user-provided
destructor does not cause the "mandatory copy elision" to take place even
though the implementation is no longer permitted to introduce a temporary:

  struct A;
  extern const A a;
  struct A {
    bool special=3Dthis=3D=3D&a;
    constexpr ~A() {}
  };
  constexpr A get() {return {};}  // or "return A();"
  constexpr A a=3Dget();
  static_assert(a.special);=