[swift-dev] SE-0047 - Defaulting non-Void functions so they warn on unused results

[Jody Schofield]

Sorry, I'm sure this has been discussed before, but what the heck???

This feature is killing me. Now I have go add @discardableResult to every
function that returns a non-Void or use the ugly syntax `_ =`?

Until swift 3 I've really enjoyed the new language. Now I find it to be
getting too rigid for the sake of "protecting" me from myself. The safety
levels needs to be dialled back some.
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