[Deather]

enum struct STest
{
    int a;
    int b;
}
STest test;

STest[] GetTest()
{
   return test;
}

Its works, but there is a problem with calling struct methods.

There is also a problem with using the same struct type as a method argument type:

enum 
struct STest
{
    int a;

    void Add(STest x)
    {
       a += x.a;
    }
}
STest test;