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

Janosch Hildebrand jnosh at jnosh.com
Fri Dec 18 16:01:47 CST 2015

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.

- Janosch

> On 18 Dec 2015, at 21:48, Erica Sadun via swift-evolution <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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