S_S>struct S
S_S>{
S_S>    public S(int i) { Prop = i; }
S_S>    public /*readonly*/ int Prop { get; }
S_S>}

S_S>static int Func(in S p)
S_S>{
S_S>    int sum = 0;
S_S>    for (int i = 0; i < 1000_000_000; i++) 
S_S>        sum = p.Prop;
S_S>    return sum;
S_S>}
S_S>