Add executable test for generic subscripts
Add executable test for generic subscripts

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