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

[Charles Kissinger]

> On Feb 24, 2016, at 9:19 PM, Paul Ossenbruggen <possen at gmail.com> wrote:
> 
> These lack conciseness. What about the already supported: 
> 
> let _ = ingoreResult()

I would be perfectly happy with requiring “let _ = “ myself. My recollection of the previous discussion is that most people didn’t want that to be necessary and preferred a suppressible warning.

Thinking about the attribute name some more, I might prefer:

@NoUnusedResultWarning

which is a variation of one of Erica’s suggestions. It is at least slightly shorter than @SuppressUnusedResultWarning

—CK

> 
> Where ignoreResult is the function. Or maybe something even more brief? What was wrong with (void)? or 
> 
> 	(_)ingoreResult()
> 
> - Paul 
> 
> 
>> On Feb 24, 2016, at 8:42 PM, Charles Kissinger via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> 
>>> On Feb 24, 2016, at 7:12 PM, Erica Sadun via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>> 
>>> I'd rather have something clear than short.
>>> 
>>> Some short ones that haven't been mentioned:
>>> @Statement has a problem because the result can be used, it's just not mandated. 
>>> @Statementable just makes no English sense at all (similarly @Procedurable) but kind of communicates the idea
>>> @ResultDiscardable: not a fan
>>> @StatementAllowed or @AllowStatement really doesn't make a ton of sense, but it's short and kind of gets the point across.
>>> @SideEffects also short, also kind hints at stuff, also could be misleading, and the same for @HasSideEffects.
>>> My favorite remains @SuppressUnusedResultWarning, which isn't short but pretty damn clear.
>> 
>> +1. This would be my choice as well. It is the warning that is affected, not the result, so “Warning” or “NoWarn” should be in the name.
>> 
>> —CK
>> 
>>>  
>>> 
>>>> On Feb 24, 2016, at 7:32 PM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>> 
>>>>> @optional_result (or ideally @optionalResult if camel-case for attributes is accepted) is clearer I think if we want a shortened two-word form.
>>>> 
>>> 
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