> 4. fourth unbound
> 
> I noticed the replacement of error? by any-type? I will look into later,
> because I have very few little grey cells available at the moment.

Could be any of 

 none?
 tuple?
 error?
 datatype?

and so on.
It must accept an any-type! arg and have no side effect.

---
Ciao
Romano


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