struct MyIota
{
    //`[index]` operator overloading
    auto opIndex(size_t index) @safe nothrow
    {
        return index;
    }

    auto lightConst()() const @property { return MyIota(); }
    auto lightImmutable()() immutable @property { return MyIota(); }
}

import mir.ndslice.iterator: FieldIterator;
alias Iterator = FieldIterator!MyIota;
alias S = Slice!(Iterator, 2);
import std.range.primitives;
static assert(hasLength!S);
static assert(hasSlicing!S);
static assert(isRandomAccessRange!S);

auto slice = Iterator().sliced(20, 10);
assert(slice[1, 2] == 12);
auto sCopy = slice.save;
assert(slice[1, 2] == 12);