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From: "de34 at live dot cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113141] New: ICE on conversion to reference in aggregate
 initialization
Date: Tue, 26 Dec 2023 01:36:13 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: ice-checking, ice-on-invalid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: de34 at live dot cn
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113141

            Bug ID: 113141
           Summary: ICE on conversion to reference in aggregate
                    initialization
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Keywords: ice-checking, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: de34 at live dot cn
  Target Milestone: ---

The following program triggers ICE since GCC 13
(https://godbolt.org/z/PaqWsG9s6):

```
int global_x{};

struct ConvToRef {
    operator int&() { return global_x; }
};

struct Foo { int& r; };

int main()
{
    Foo bar{ { ConvToRef{} } };
}
```

Clang considers this ill-formed and emits "non-const lvalue reference to ty=
pe
'int' cannot bind to an initializer list temporary".

If the type of r is changed to const int&, the program correctly compiles w=
ith
GCC.=