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

[Adrian Kashivskyy]

Matthew, I actually like your idea better than using an opposite "@suppress_unused_result" attribute. In addition, it will even be easier to implement, since "let _" syntax is already supported in the language.

Pozdrawiam – Regards,
Adrian Kashivskyy

> Wiadomość napisana przez Matthew Johnson <matthew at anandabits.com> w dniu 11.12.2015, o godz. 00:28:
> 
> 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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