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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/32385] g++ rejects struct in default argument of template
 function
Date: Sat, 24 Jul 2021 01:55:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D32385

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
clang also rejects this:
<source>:3:34: error: 'A::(unnamed struct at <source>:3:34)' cannot be defi=
ned
in a type specifier
  template<int> void foo(int =3D ((struct { int i; }) {0}).i);
                                 ^
<source>:3:57: error: member reference base type 'void' is not a structure =
or
union
  template<int> void foo(int =3D ((struct { int i; }) {0}).i);
                               ~~~~~~~~~~~~~~~~~~~~~~~~~^~
2 errors generated.=