[patterns] on treatment of null

Maurizio Cimadamore maurizio.cimadamore at oracle.com
Fri Jul 7 12:56:52 UTC 2017

over the last few weeks we've been exploring the twisted relationship 
between patterns and nulls. This document:


provides some (hopefully helpful) insights into what the design space 
looks like.


Looks like trying to force the same rule on all patterns, regardless of 
where they appear, leads to problems. Distinguishing between toplevel 
and nested patterns provides a good basis to handle null in a more 
predictable/flexible fashion.

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