Convert if-chain to an exhaustive switch and add the missing case for 'yield'.
Convert if-chain to an exhaustive switch and add the missing case for 'yield'.

tkremenek/swift,harlanhaskins/swift,JGiola/swift,nathawes/swift,devincoughlin/swift,karwa/swift,jmgc/swift,gregomni/swift,shahmishal/swift,stephentyrone/swift,allevato/swift,natecook1000/swift,airspeedswift/swift,gribozavr/swift,xedin/swift,practicalswift/swift,practicalswift/swift,danielmartin/swift,gribozavr/swift,rudkx/swift,alblue/swift,benlangmuir/swift,devincoughlin/swift,amraboelela/swift,stephentyrone/swift,danielmartin/swift,CodaFi/swift,atrick/swift,tkremenek/swift,allevato/swift,gribozavr/swift,sschiau/swift,parkera/swift,atrick/swift,sschiau/swift,tkremenek/swift,benlangmuir/swift,airspeedswift/swift,rudkx/swift,alblue/swift,rudkx/swift,rudkx/swift,karwa/swift,CodaFi/swift,hooman/swift,harlanhaskins/swift,nathawes/swift,stephentyrone/swift,practicalswift/swift,aschwaighofer/swift,hooman/swift,austinzheng/swift,alblue/swift,brentdax/swift,apple/swift,shajrawi/swift,shahmishal/swift,jmgc/swift,devincoughlin/swift,amraboelela/swift,aschwaighofer/swift,natecook1000/swift,brentdax/swift,ahoppen/swift,danielmartin/swift,karwa/swift,jmgc/swift,ahoppen/swift,hooman/swift,ahoppen/swift,alblue/swift,stephentyrone/swift,austinzheng/swift,aschwaighofer/swift,CodaFi/swift,nathawes/swift,airspeedswift/swift,ahoppen/swift,roambotics/swift,xedin/swift,brentdax/swift,apple/swift,jckarter/swift,lorentey/swift,austinzheng/swift,harlanhaskins/swift,brentdax/swift,practicalswift/swift,hooman/swift,karwa/swift,shajrawi/swift,alblue/swift,devincoughlin/swift,practicalswift/swift,roambotics/swift,gribozavr/swift,sschiau/swift,shajrawi/swift,stephentyrone/swift,karwa/swift,atrick/swift,rudkx/swift,roambotics/swift,airspeedswift/swift,apple/swift,shahmishal/swift,amraboelela/swift,parkera/swift,devincoughlin/swift,austinzheng/swift,nathawes/swift,benlangmuir/swift,jmgc/swift,shajrawi/swift,karwa/swift,hooman/swift,atrick/swift,CodaFi/swift,allevato/swift,stephentyrone/swift,tkremenek/swift,glessard/swift,JGiola/swift,lorentey/swift,amraboelela/swift,hooman/swift,practicalswift/swift,gregomni/swift,xwu/swift,jckarter/swift,gregomni/swift,benlangmuir/swift,sschiau/swift,gribozavr/swift,amraboelela/swift,gregomni/swift,lorentey/swift,gregomni/swift,austinzheng/swift,natecook1000/swift,shajrawi/swift,austinzheng/swift,gregomni/swift,austinzheng/swift,JGiola/swift,amraboelela/swift,shahmishal/swift,roambotics/swift,tkremenek/swift,allevato/swift,tkremenek/swift,shajrawi/swift,gribozavr/swift,parkera/swift,sschiau/swift,nathawes/swift,practicalswift/swift,gribozavr/swift,shahmishal/swift,JGiola/swift,ahoppen/swift,CodaFi/swift,tkremenek/swift,xedin/swift,karwa/swift,sschiau/swift,shahmishal/swift,CodaFi/swift,aschwaighofer/swift,aschwaighofer/swift,apple/swift,parkera/swift,harlanhaskins/swift,sschiau/swift,allevato/swift,alblue/swift,amraboelela/swift,jckarter/swift,airspeedswift/swift,lorentey/swift,karwa/swift,sschiau/swift,shajrawi/swift,glessard/swift,aschwaighofer/swift,nathawes/swift,xedin/swift,alblue/swift,glessard/swift,xwu/swift,allevato/swift,lorentey/swift,natecook1000/swift,devincoughlin/swift,jmgc/swift,parkera/swift,natecook1000/swift,parkera/swift,danielmartin/swift,lorentey/swift,stephentyrone/swift,ahoppen/swift,JGiola/swift,parkera/swift,xwu/swift,jckarter/swift,xedin/swift,jmgc/swift,shahmishal/swift,jckarter/swift,devincoughlin/swift,rudkx/swift,shahmishal/swift,danielmartin/swift,aschwaighofer/swift,glessard/swift,CodaFi/swift,airspeedswift/swift,glessard/swift,JGiola/swift,harlanhaskins/swift,xwu/swift,xwu/swift,airspeedswift/swift,xedin/swift,danielmartin/swift,xwu/swift,hooman/swift,brentdax/swift,jckarter/swift,allevato/swift,natecook1000/swift,brentdax/swift,brentdax/swift,gribozavr/swift,parkera/swift,apple/swift,xwu/swift,lorentey/swift,harlanhaskins/swift,devincoughlin/swift,jckarter/swift,benlangmuir/swift,xedin/swift,glessard/swift,practicalswift/swift,lorentey/swift,roambotics/swift,jmgc/swift,danielmartin/swift,benlangmuir/swift,harlanhaskins/swift,atrick/swift,natecook1000/swift,xedin/swift,atrick/swift,roambotics/swift,shajrawi/swift,nathawes/swift,apple/swift