import std.stdio;

import std.algorithm: filter;

​

void main()

{

    int[][] whatever = [

        [0],

        [0, 1, 2],

        [5, 6, 7, 8, 9, 10]

    ];

    writeln(whatever[2]); // [5, 6, 7, 8, 9, 10]

    auto x = whatever[2].filter(x => x > 7); // error

}

​