Refactorability

int var2 = 21;

int main()
{
    int var3 = 32;
    
    struct{int a;} C1 = {.a = 5};
    struct{int a = 5;} Cpp1;
    
    struct{int a;} C2 = {.a = var2};
    struct{int a = var2;} Cpp2;
    
    struct{int a;} C3 = {.a = var3};
    struct{int a = var3;} Cpp3; // Refactorability 101 fail.
    
    return 0;
}