void main ()

{

    struct F

    {

        int i;

        ushort _x;

        void x(ushort v) pure

        {_x = v;}

        ushort x() const

        { return _x; }

    }

​

    immutable F f1 = () pure {

    F lf = F();

    return lf; }();

    // Error: cannot implicitly convert expression delegate () => lf() of type F to immutable(F)

​

    F makeF() pure

    {

        F lf = F();

        return lf;

    }

    immutable F f2 = makeF();

    // Error: cannot implicitly convert expression makeF() of type F to immutable(F)

}

​