OK; so I have functions working. What's next?
1. func type and closures
2. return support
3. tail-call optimization
May try 3 tonight. 2 may be hard in Go, not sure how to "exit" frames (no exceptions!). 1 is probably the boring one; just a bit of work, but not too hard.
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So turns out implementing return was easier.
I still need to "fix" the implicit return, but after a lot if scratching I couldn't get the tail call optimisation to work 🤷
