int[] a = [ 1, 2, 3 ]; string[] b = [ "a", "b", "c" ]; sort!("a[0] > b[0]")(zip(a, b)); or int[] a = [ 1, 2, 3 ]; string[] b = [ "a", "b", "c" ]; sort!(@[0] > @[0])(zip(a, b)); -- auto var = sequence!("a[1] + n-1 + a[0]")(1, 2); or auto var = sequence!(@1[1] + n-1 + @1[0])(1, 2);