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);