IDE0059.cs

unsafe class Program
{
    static void Main()
    {
        IO io = new(42);
        IOPtr ioPtr = new(&io);
        Settings(ioPtr);

        Console.WriteLine(io.Foo);
    }

    static void Settings(IOPtr ioPtr) // IDE0060: Parameter 'ioPtr' can be removed; its initial value is never used
    {
        ioPtr.Foo = 12; // IDE0059: Unnecessary assignment of a value to 'ioPtr'
    }
}

struct IO(int foo)
{
    public int Foo = foo;
}

readonly unsafe struct IOPtr(IO* ptr)
{
    private readonly IO* _ptr = ptr;

    public ref int Foo => ref _ptr->Foo;
}