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

Wed Mar 2 15:14:53 CST 2016

> -1 on implementing an attribute to allow API designers to mark it as discardable
This might be fine for your style, but please don't ignore that there is no single way:
Techniques like method chaining aren't common in Cocoa, but my guess that this is just because the syntax of Objective-C is a bad fit for chaining, which looks much nicer in Swift.

> let _ = discardableResult()

Imho the problems of using "_" to discard results are clearly visible in this thread:
"let" isn't needed, yet it is used in many examples…

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