Anonymous union emebed into struct which Equivalent to C in Vlang

Question

Suppose I have a C code where Anonymous union emebed into struct :

  struct sname{
    union{int a;};
    int b;
  }

how to write Equivalent code in Vlang ?

I have tried this piece,but it can not pass compilation of V,error happened:error: unexpected keyword union, expecting name:

struct Sname {
  union {
    a int
   }
   b int
}

thanks.