add expectation for "does not conform to protocol" error diag
add expectation for "does not conform to protocol" error diag

this error was being generated, but previously not emitted

parkera/swift,parkera/swift,tkremenek/swift,atrick/swift,tkremenek/swift,glessard/swift,tkremenek/swift,atrick/swift,tkremenek/swift,xwu/swift,glessard/swift,hooman/swift,atrick/swift,apple/swift,glessard/swift,rudkx/swift,parkera/swift,gregomni/swift,xwu/swift,rudkx/swift,xwu/swift,glessard/swift,ahoppen/swift,JGiola/swift,benlangmuir/swift,gregomni/swift,JGiola/swift,xwu/swift,parkera/swift,rudkx/swift,atrick/swift,JGiola/swift,atrick/swift,roambotics/swift,JGiola/swift,xwu/swift,rudkx/swift,benlangmuir/swift,JGiola/swift,hooman/swift,roambotics/swift,roambotics/swift,hooman/swift,benlangmuir/swift,benlangmuir/swift,benlangmuir/swift,parkera/swift,gregomni/swift,ahoppen/swift,apple/swift,parkera/swift,atrick/swift,hooman/swift,apple/swift,hooman/swift,tkremenek/swift,xwu/swift,xwu/swift,ahoppen/swift,glessard/swift,parkera/swift,apple/swift,rudkx/swift,JGiola/swift,gregomni/swift,gregomni/swift,roambotics/swift,apple/swift,ahoppen/swift,roambotics/swift,roambotics/swift,benlangmuir/swift,hooman/swift,ahoppen/swift,gregomni/swift,rudkx/swift,ahoppen/swift,tkremenek/swift,apple/swift,glessard/swift,hooman/swift,tkremenek/swift,parkera/swift