I'm following https://vibed.org/blog/posts/a-scalable-chat-room-service-in-d.

Here's my app.d: https://gist.github.com/AndrejMitrovic/73a6c256155bf90ea6d3593334a3d662

And room.dt: https://gist.github.com/AndrejMitrovic/a60d1429ec050c694412c32f3c8fb9ab

I get this output when building:

$ Compiling Diet HTML template index.dt...
$ Compiling Diet HTML template room.dt...
$ room.dt(12,15): Error: undefined identifier messages

I thought initially the issue was that messages was private in the Room class, but trying to make it public didn't fix the issue. I think I am missed some step in the tutorial?