Runtime casting test: the comment says that P1 should be defined in the core library, restore this
Runtime casting test: the comment says that P1 should be defined in the core library, restore this

manavgabhawala/swift,hooman/swift,karwa/swift,OscarSwanros/swift,sschiau/swift,aschwaighofer/swift,amraboelela/swift,jmgc/swift,gottesmm/swift,djwbrown/swift,swiftix/swift,frootloops/swift,tinysun212/swift-windows,modocache/swift,glessard/swift,Jnosh/swift,parkera/swift,JGiola/swift,shahmishal/swift,jtbandes/swift,JaSpa/swift,swiftix/swift,gmilos/swift,benlangmuir/swift,airspeedswift/swift,bitjammer/swift,hughbe/swift,rudkx/swift,huonw/swift,danielmartin/swift,gmilos/swift,practicalswift/swift,shajrawi/swift,gottesmm/swift,hughbe/swift,zisko/swift,JaSpa/swift,tinysun212/swift-windows,xwu/swift,tjw/swift,airspeedswift/swift,kperryua/swift,zisko/swift,jckarter/swift,brentdax/swift,tjw/swift,lorentey/swift,calebd/swift,devincoughlin/swift,hooman/swift,jopamer/swift,arvedviehweger/swift,felix91gr/swift,hughbe/swift,milseman/swift,return/swift,natecook1000/swift,gmilos/swift,calebd/swift,JGiola/swift,tjw/swift,alblue/swift,huonw/swift,tardieu/swift,manavgabhawala/swift,codestergit/swift,kstaring/swift,OscarSwanros/swift,tkremenek/swift,jopamer/swift,return/swift,jmgc/swift,modocache/swift,jtbandes/swift,xwu/swift,CodaFi/swift,harlanhaskins/swift,harlanhaskins/swift,practicalswift/swift,karwa/swift,therealbnut/swift,aschwaighofer/swift,tjw/swift,nathawes/swift,kperryua/swift,CodaFi/swift,shahmishal/swift,airspeedswift/swift,lorentey/swift,nathawes/swift,austinzheng/swift,kperryua/swift,ahoppen/swift,stephentyrone/swift,OscarSwanros/swift,codestergit/swift,tinysun212/swift-windows,aschwaighofer/swift,kstaring/swift,benlangmuir/swift,uasys/swift,shajrawi/swift,JaSpa/swift,practicalswift/swift,felix91gr/swift,CodaFi/swift,aschwaighofer/swift,glessard/swift,huonw/swift,milseman/swift,rudkx/swift,OscarSwanros/swift,jopamer/swift,alblue/swift,apple/swift,brentdax/swift,allevato/swift,tkremenek/swift,kstaring/swift,airspeedswift/swift,IngmarStein/swift,austinzheng/swift,natecook1000/swift,shajrawi/swift,atrick/swift,practicalswift/swift,gmilos/swift,calebd/swift,devincoughlin/swift,Jnosh/swift,devincoughlin/swift,lorentey/swift,xedin/swift,airspeedswift/swift,xwu/swift,allevato/swift,tardieu/swift,kperryua/swift,return/swift,benlangmuir/swift,felix91gr/swift,tkremenek/swift,shajrawi/swift,karwa/swift,amraboelela/swift,natecook1000/swift,tinysun212/swift-windows,danielmartin/swift,nathawes/swift,tkremenek/swift,gottesmm/swift,jmgc/swift,gregomni/swift,Jnosh/swift,calebd/swift,manavgabhawala/swift,zisko/swift,stephentyrone/swift,harlanhaskins/swift,parkera/swift,parkera/swift,gregomni/swift,shahmishal/swift,kstaring/swift,tardieu/swift,huonw/swift,gregomni/swift,shahmishal/swift,tardieu/swift,practicalswift/swift,practicalswift/swift,devincoughlin/swift,hooman/swift,tjw/swift,bitjammer/swift,therealbnut/swift,brentdax/swift,milseman/swift,deyton/swift,stephentyrone/swift,swiftix/swift,JaSpa/swift,ben-ng/swift,arvedviehweger/swift,ahoppen/swift,return/swift,uasys/swift,bitjammer/swift,amraboelela/swift,calebd/swift,glessard/swift,ben-ng/swift,ahoppen/swift,brentdax/swift,manavgabhawala/swift,natecook1000/swift,jckarter/swift,atrick/swift,amraboelela/swift,frootloops/swift,djwbrown/swift,apple/swift,deyton/swift,shahmishal/swift,CodaFi/swift,jtbandes/swift,atrick/swift,IngmarStein/swift,gribozavr/swift,frootloops/swift,jckarter/swift,jtbandes/swift,sschiau/swift,Jnosh/swift,therealbnut/swift,practicalswift/swift,gmilos/swift,benlangmuir/swift,xedin/swift,hughbe/swift,parkera/swift,glessard/swift,roambotics/swift,JGiola/swift,tkremenek/swift,brentdax/swift,austinzheng/swift,ben-ng/swift,sschiau/swift,glessard/swift,sschiau/swift,lorentey/swift,zisko/swift,djwbrown/swift,shajrawi/swift,karwa/swift,practicalswift/swift,JGiola/swift,gribozavr/swift,jmgc/swift,bitjammer/swift,alblue/swift,roambotics/swift,tinysun212/swift-windows,alblue/swift,roambotics/swift,huonw/swift,apple/swift,deyton/swift,IngmarStein/swift,kstaring/swift,felix91gr/swift,djwbrown/swift,tjw/swift,IngmarStein/swift,apple/swift,OscarSwanros/swift,karwa/swift,roambotics/swift,ahoppen/swift,manavgabhawala/swift,arvedviehweger/swift,arvedviehweger/swift,jckarter/swift,gribozavr/swift,huonw/swift,uasys/swift,tkremenek/swift,IngmarStein/swift,gribozavr/swift,kstaring/swift,shajrawi/swift,gribozavr/swift,amraboelela/swift,ahoppen/swift,danielmartin/swift,gottesmm/swift,alblue/swift,CodaFi/swift,uasys/swift,uasys/swift,bitjammer/swift,tinysun212/swift-windows,rudkx/swift,glessard/swift,therealbnut/swift,ben-ng/swift,huonw/swift,kperryua/swift,calebd/swift,felix91gr/swift,xwu/swift,modocache/swift,milseman/swift,milseman/swift,frootloops/swift,codestergit/swift,gribozavr/swift,milseman/swift,harlanhaskins/swift,OscarSwanros/swift,gregomni/swift,alblue/swift,austinzheng/swift,sschiau/swift,parkera/swift,natecook1000/swift,gmilos/swift,deyton/swift,atrick/swift,stephentyrone/swift,tardieu/swift,JGiola/swift,Jnosh/swift,xwu/swift,jopamer/swift,Jnosh/swift,lorentey/swift,nathawes/swift,xwu/swift,karwa/swift,harlanhaskins/swift,jopamer/swift,allevato/swift,gribozavr/swift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