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

[Guillaume Lessard]

> On 10 déc. 2015, at 15:58, Adrian Kashivskyy via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I think non-void functions should warn about their return value being unused by default, thus eliminating the need to attribute them with @warn_unused_result.

I strongly don’t like this idea. This being said, if it happens ann attribute that says "unused result are acceptable" must be created. Makes me wince.

Guillaume Lessard