The first example in the Learning D book, wont compile

[Ali]

On Sunday, 25 March 2018 at 20:45:58 UTC, Ali wrote:
> Hi
>
> The first example in the Learning D book
>
> import core.thread;
> import std.stdio;
>
> void main() {
>     import std.range: iota, range;
>     write("Greeting in, ");
>     foreach(num; iota(1, 4).range) {
>         writef("%s...", num);
>         stdout.flush();
>         Thread.sleep(1.seconds);
>     }
>     writeln();
>     writeln("Hello, World");
> }
>
>
> wont compile and give this error
>
> hello.d(5): Error: module `std.range` import range not found
>
> this should be an easy issue to fix, except that googling this 
> error doesnt return anything useful


I now see my typo, should be retro, not range