Add unused warning to flatten helpers
Add unused warning to flatten helpers

RuiAAPeres/ReactiveCocoa,yonekawa/ReactiveCocoa,llb1119/test,PSPDFKit-labs/ReactiveCocoa,sandyway/ReactiveCocoa,ohwutup/ReactiveCocoa,calebd/ReactiveCocoa,ikesyo/ReactiveCocoa,esttorhe/ReactiveCocoa,victorlin/ReactiveCocoa,natestedman/ReactiveCocoa,andersio/ReactiveCocoa,smilypeda/ReactiveCocoa,calebd/ReactiveCocoa,tonyarnold/ReactiveCocoa,paulyoung/ReactiveCocoa,yonekawa/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,calebd/ReactiveCocoa,sandyway/ReactiveCocoa,tzongw/ReactiveCocoa,natestedman/ReactiveCocoa,Juraldinio/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,llb1119/test,rpowelll/ReactiveCocoa,tzongw/ReactiveCocoa,kevin-zqw/ReactiveCocoa,esttorhe/ReactiveCocoa,victorlin/ReactiveCocoa,tzongw/ReactiveCocoa,ohwutup/ReactiveCocoa,smilypeda/ReactiveCocoa,rpowelll/ReactiveCocoa,andersio/ReactiveCocoa,andersio/ReactiveCocoa,kevin-zqw/ReactiveCocoa,paulyoung/ReactiveCocoa,sandyway/ReactiveCocoa,beni55/ReactiveCocoa,esttorhe/ReactiveCocoa,Juraldinio/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,tonyarnold/ReactiveCocoa,walkingsmarts/ReactiveCocoa,beni55/ReactiveCocoa,esttorhe/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,Farteen/ReactiveCocoa,paulyoung/ReactiveCocoa,llb1119/test,natestedman/ReactiveCocoa,beni55/ReactiveCocoa,victorlin/ReactiveCocoa,Farteen/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,kevin-zqw/ReactiveCocoa,Juraldinio/ReactiveCocoa,ohwutup/ReactiveCocoa,tonyarnold/ReactiveCocoa,yonekawa/ReactiveCocoa,walkingsmarts/ReactiveCocoa,Farteen/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,rpowelll/ReactiveCocoa,ikesyo/ReactiveCocoa,walkingsmarts/ReactiveCocoa,smilypeda/ReactiveCocoa