[swift-dev] Argument unused warnings

[Chris Lattner]

> On May 17, 2016, at 1:25 PM, Dmitri Gribenko via swift-dev <swift-dev at swift.org> wrote:
> 
> On Tue, May 17, 2016 at 12:37 PM, Daniel Dunbar via swift-dev
> <swift-dev at swift.org> wrote:
>> Something broke yesterday causing Swift to report gobs of argument unused warnings, see:
>>  https://bugs.swift.org/browse/SR-1546
>> for a reference.
>> 
>> Does anyone know who this should go to?
> 
> https://github.com/apple/swift/commit/3549ec540408d760c255a526b1cff85644cb96d5 ?

Right, this is intentional behavior as part of SE-0047: https://github.com/apple/swift-evolution/blob/master/proposals/0047-nonvoid-warn.md

It was a bug that calls to these non-void methods didn’t warn before.  They can be marked with the @discardableResult attribute if that makes sense.

-Chris