Q: how to make examples work using the -demo flag

[jkleiser]

I just installed zygo v5.0.1 on my Mac (macOS 10.14.1), and when I try the example I found in the wiki

(def sn (snoopy asst: (hornet forecast: (weather desc:"sunny"))))

then I get

error in evalGeneratedFunction:4: Error calling 'infix': symbol `weather` not found
in infix:0
in __main:22

What may be the problem here?

[glycerine]

Yeah. Sorry this isn't clearer. It's perfectly natural to wonder why this would work at all. After all. Without a prior function definition, defmap, or registration of a Go struct, none of the snoopy, hornet, or weather calls should work. Nobody has defined those functions.

So what is going on. Well, there is a special flag for demo and testing purposes.

https://github.com/glycerine/zygomys/blob/master/zygo/cfg.go#L43

So the trick is, starting zygo with zygo -demo will register those functions, letting the example function.