[swift-evolution] Make non-void functions @warn_unused_result by default

[Jean-Daniel Dupas]

IMHO, before any decision, it may be interesting to write a quick patch and run the modified compiler on real code to see how much false positive it would generate.

> Le 24 févr. 2016 à 16:13, Janosch Hildebrand via swift-evolution <swift-evolution at swift.org> a écrit :
> 
> Erica's proposal about "Modernizing Attribute Case and Attribute Argument Naming" made me remember this discussion.
> 
> I don't think a proposal was ever submitted? If no one else is working on a proposal already I would offer myself up for writing this up.
> 
> - Janosch
> 
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