[pathsjs]

Of course template can return values.

The problem is that they need to be given the AST. What if one constructs a handler somewhere in another module (say an authentication handler) and you import it? How can you reuse it, considering that it needs to surround other handlers (that is, if auth fails, you do not go inside inner handlers)?

With Rosencrantz it is easy: if `auth` is our authentication handler, and in your module you define a handler `h`, you can use `auth -> h`, or `auth[h]` if you want to spell `h` inline.

Now, what you could in fact do is write a template `authTemplate` that takes a handler `h` and returns `auth -> h`, so that you can still write in template style. But you have to do this for all handlers.

It could make sense to provide such templates for builtin handlers, though... want to chime in? :-)