import std.traits;

​

struct FiberS {

    static auto getThis(){

        return Fiber.getId();

    }

}

​

struct Proxy(T){

    T* ptr;

    alias getPayload this;

    @property ref auto getPayload() inout return {

        return * ptr ;

    }

    static auto getId(){

        return 1;

    }

}

alias Fiber = Proxy!(FiberS);

​

​

extern(C) void main(){

       auto id = Fiber.getThis(); // work here

}

​

struct TcpStream {

    void read(ubyte[] data){

           auto id = Fiber.getThis(); // not work here in my case

    }

}