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

[Matthew Johnson]

Why should unused results be acceptable?  Why not require callers to explicitly throw away the result:

let _ = funcReturningValueThatIsIgnored()

Yes this is extra syntax, but it also makes it clear that the value was intended to be ignored and the function was only executed for side-effects.  

> On Dec 10, 2015, at 5:23 PM, Guillaume Lessard via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> 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
> 
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