[Bug c/123939] Can't use `auto` type inference even though the RHS does not declare non ordinary identifiers

[jsm28 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123939

--- Comment #4 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Structures without named members are also not valid in standard C (becoming
implementation-defined in C2y).