Question about UDAs

Cecil Ward cecil at
Mon Aug 3 03:00:08 UTC 2020

When practically speaking would you use UDAs? A real-world 
use-case? I’ve seen them in use already for core language 
features instead of keywords like "pure", and I suppose this 
choice keeps the number of keywords down and the result is 
perhaps easier to extend. The motivation for these usages is 
clear but I don’t understand how I might use them in my own code. 
Ali Çehreli’s book mentions them briefly with an example but that 
doesn’t seem to qualify as a realistic use-case.

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