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

[Haravikk]

> On 24 Feb 2016, at 19:27, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> on Wed Feb 24 2016, Chris Lattner <swift-evolution at swift.org> wrote:
> 
>>> On Feb 24, 2016, at 7:13 AM, Janosch Hildebrand via swift-evolution <swift-evolution at swift.org> wrote:
>>> 
>>> Erica's proposal about "Modernizing Attribute Case and Attribute Argument Naming" made me remember this discussion.
>>> 
>>> I don't think a proposal was ever submitted? If no one else is
>>> working on a proposal already I would offer myself up for writing
>>> this up.
>> 
>> I don’t recall a real proposal, it would be great for you to drive this.
> 
> Yes, please!  I *really* want this change.

Same!

The only thing that needs to be considered is what to name the replacement attribute (for methods where the return value isn’t important). I’m thinking @optionalReturn or @ignoreUnusedResult or such.