pure @system unittest{    import std.container.array;     auto arr = Array!int(0, 2, 3);    assert(arr[0] == 0);    assert(arr.front == 0);    assert(arr.back == 3);     // reserve space    arr.reserve(1000);    assert(arr.length == 3);    assert(arr.capacity >= 1000);     // insertion    arr.insertBefore(arr[1..$], 1);    assert(arr.front == 0);    assert(arr.length == 4);     arr.insertBack(4);    assert(arr.back == 4);    assert(arr.length == 5);     // set elements    arr[1] *= 42;    assert(arr[1] == 42);} pure @system unittest{    import std.container.array;     import std.algorithm.comparison : equal;    auto arr = Array!int(1, 2, 3);     // concat    auto b = Array!int(11, 12, 13);    arr ~= b;    assert(arr.length == 6);     // slicing    assert(arr[1 .. 3].equal([2, 3]));     // remove    arr.linearRemove(arr[1 .. 3]);    assert(arr[0 .. 2].equal([1, 11]));} pure @system unittest{    import std.container.array;     auto arr = Array!bool([true, true, false, true, false]);    assert(arr.length == 5);}