memoize

I'm still hoping for a nicer solution.

The make install task installs the following files:

There are work arounds, but nothing clean. I just feel like this should be functionality that should be part of the slot feature.

I totally get not wanting to extend the syntax. I tried doing these things and in practice it was not easy or pretty. Actions provide a much cleaner and easier way to accomplish a certain set of functionality that would be much more difficult without it.