On Jul 16, 2026, at 20:59, Russell Shaw via Std-Discussion <std-discussion@lists.isocpp.org> wrote:

Hi,

[class.union.anon] says "Nested types, anonymous unions, and functions
shall not be declared within an anonymous union."

It seems pretty definite. Everywhere i read and g++ allows them.

struct A {

   union {
union {
   int x;
};
   };

   A() {
int a = x;
   }
};

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