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

[Dave Abrahams]

> On Dec 18, 2015, at 2:01 PM, Janosch Hildebrand via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I am also strongly in favor of this proposal.
> 
> There are probably enough valid use cases for a @suppress_unused_warning but personally I don't think pop() is a great example.
> 
> I think a second method à la dropFirst/Last/... that returns Void would be better at communicating intent and allows pop() to retain the warning.

Those are non-mutating methods that don’t return Void, FWIW.  Names to be adjusted accordingly… ;-)

> 
> - Janosch
> 
>> On 18 Dec 2015, at 21:48, Erica Sadun via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> I vote +1 in favor of making warn_unused_result the default. It's simple, elegant, logical, functional, and will reduce stdlib clutter.
>> 
>> As for replacing it? Although I'd probably be okay with suppress_unused_warning, please consider optional hey_no_worries_mate_on_unused, unused_is_mellow, or dont_harsh_my_unused. Supporting _ = pop() without further warning is icing on the cake, as it enables the behavior to be established at either the API or consuming end.
>> 
>> -- E
>> 
>>> On Dec 18, 2015, at 1:25 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>> 
>>>> On Dec 18, 2015, at 3:47 AM, Tino Heth via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>> 
>>>>> _ = pop()
>>>> 
>>>> Now that's what I'd call ugly - I vote against everything that forces me to use more underscores ;-)
>>> 
>>> “pop()” is an example of the comparatively-rare method that one might want to annotate to avoid the warning: the side-effect is useful even if you’re dropping the result.  We’re only talking about making warn_unused_result the default, not making it the only option.
>>> 
>>> -Dave
>>> 
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-Dave



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