[Ur] Error handling in Ur

[foldr at tutanota.com]

Hi all,

How do I handle application errors in Ur? Is there a preferred method which 
allows to check whether all errors have their handlers or not?

I am looking for maybe something similar to the below:
http://sylvain-henry.info/home/posts/2016-03-18-first-experiments-with-dependent-types.html
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