[Bug c++/106233] New: Designated initializers targeting inherited fields breaks reshape_init_class, at cp/decl.c:6456

["drahflow at gmx dot de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106233

            Bug ID: 106233
           Summary: Designated initializers targeting inherited fields
                    breaks reshape_init_class, at cp/decl.c:6456
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: drahflow at gmx dot de
  Target Milestone: ---

In a vain attempt to use designated initializers to target inherited fields, I
discovered that running

g++ -W -Wall --std=c++20

... on ...

struct Base {
  int i;
};

struct Derived: public Base {
  using Base::i;
};

int main(void) {
  Derived d{
    .i = 0,
  };

  return d.i;
}

... results in ...

designated-usage.c++: In function ‘int main()’:
designated-usage.c++:12:3: internal compiler error: in reshape_init_class, at
cp/decl.c:6456
   12 |   };
      |   ^
0x7f080f8137fc __libc_start_main
        ../csu/libc-start.c:332
Please submit a full bug report, [...]

... for ...

g++ --version
g++ (Debian 11.2.0-18) 11.2.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



GCC 12.1 gives

<source>: In function 'int main()':
<source>:12:3: error: 'Base::i' is not a direct member of 'Derived'
   12 |   };
      |   ^
Compiler returned: 1

... the correctness of which I don't feel qualified to judge.