import std.stdio : writeln;

import std.range : ElementType;

​

struct S {

    void opIndexAssign(X, RANGE)(X x, RANGE range)

        if (is(ElementType!RANGE : size_t))

    {

        writeln(__FUNCTION__);

    }

​

    auto opSlice(size_t dim)(size_t start, size_t end) {

        import std.range : iota;

        return iota(start, end);

    }

}

​

void main()

{

    auto arr = new int[7];

​

    S s;

    s.opIndexAssign(arr[1..4], s.opSlice!0(0,3));

    s[0..3] = arr[1..4];

}