Should the following two uses be a compile-time error? foreach(i; 10 .. 0) // Never executes foreach(i; iota(10, 0)) // .. neither does this I would like the second to either be a compile-time error or automagically use a negative step. So we need to use a negative step in iota() or use a for loop foreach(i; iota(10, 0, -1)) // as expected