Add role-checking ASSERT to mkCast
Add role-checking ASSERT to mkCast

vTurbine/ghc,tjakway/ghcjvm,vTurbine/ghc,lukexi/ghc-7.8-arm64,siddhanathan/ghc,mfine/ghc,da-x/ghc,spacekitteh/smcghc,mettekou/ghc,christiaanb/ghc,forked-upstream-packages-for-ghcjs/ghc,da-x/ghc,sdiehl/ghc,olsner/ghc,frantisekfarka/ghc-dsi,sgillespie/ghc,ghc-android/ghc,mfine/ghc,anton-dessiatov/ghc,spacekitteh/smcghc,sdiehl/ghc,ghc-android/ghc,da-x/ghc,nathyong/microghc-ghc,nushio3/ghc,bitemyapp/ghc,AlexanderPankiv/ghc,ghc-android/ghc,fmthoma/ghc,lukexi/ghc-7.8-arm64,gridaphobe/ghc,sdiehl/ghc,wxwxwwxxx/ghc,elieux/ghc,ml9951/ghc,mfine/ghc,vikraman/ghc,christiaanb/ghc,forked-upstream-packages-for-ghcjs/ghc,nkaretnikov/ghc,olsner/ghc,nkaretnikov/ghc,nushio3/ghc,forked-upstream-packages-for-ghcjs/ghc,nathyong/microghc-ghc,forked-upstream-packages-for-ghcjs/ghc,acowley/ghc,tjakway/ghcjvm,shlevy/ghc,urbanslug/ghc,snoyberg/ghc,tjakway/ghcjvm,jstolarek/ghc,da-x/ghc,mfine/ghc,anton-dessiatov/ghc,ezyang/ghc,jstolarek/ghc,snoyberg/ghc,shlevy/ghc,mettekou/ghc,AlexanderPankiv/ghc,da-x/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,tibbe/ghc,acowley/ghc,olsner/ghc,snoyberg/ghc,bitemyapp/ghc,snoyberg/ghc,christiaanb/ghc,sgillespie/ghc,olsner/ghc,anton-dessiatov/ghc,spacekitteh/smcghc,oldmanmike/ghc,green-haskell/ghc,lukexi/ghc,sgillespie/ghc,gcampax/ghc,olsner/ghc,gcampax/ghc,nushio3/ghc,ml9951/ghc,sgillespie/ghc,frantisekfarka/ghc-dsi,vikraman/ghc,urbanslug/ghc,hferreiro/replay,gridaphobe/ghc,sdiehl/ghc,mcschroeder/ghc,olsner/ghc,acowley/ghc,AlexanderPankiv/ghc,elieux/ghc,green-haskell/ghc,hferreiro/replay,oldmanmike/ghc,vTurbine/ghc,wxwxwwxxx/ghc,sdiehl/ghc,AlexanderPankiv/ghc,ml9951/ghc,gridaphobe/ghc,ezyang/ghc,urbanslug/ghc,elieux/ghc,mettekou/ghc,hferreiro/replay,nushio3/ghc,lukexi/ghc-7.8-arm64,acowley/ghc,bitemyapp/ghc,oldmanmike/ghc,anton-dessiatov/ghc,anton-dessiatov/ghc,mettekou/ghc,sgillespie/ghc,holzensp/ghc,tjakway/ghcjvm,acowley/ghc,gcampax/ghc,christiaanb/ghc,ryantm/ghc,lukexi/ghc,tibbe/ghc,elieux/ghc,nushio3/ghc,oldmanmike/ghc,TomMD/ghc,holzensp/ghc,bitemyapp/ghc,mcschroeder/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,siddhanathan/ghc,nkaretnikov/ghc,vTurbine/ghc,fmthoma/ghc,bitemyapp/ghc,shlevy/ghc,vikraman/ghc,nkaretnikov/ghc,forked-upstream-packages-for-ghcjs/ghc,sgillespie/ghc,forked-upstream-packages-for-ghcjs/ghc,snoyberg/ghc,nathyong/microghc-ghc,forked-upstream-packages-for-ghcjs/ghc,tjakway/ghcjvm,frantisekfarka/ghc-dsi,gridaphobe/ghc,green-haskell/ghc,TomMD/ghc,AlexanderPankiv/ghc,nushio3/ghc,wxwxwwxxx/ghc,GaloisInc/halvm-ghc,urbanslug/ghc,ezyang/ghc,ryantm/ghc,olsner/ghc,siddhanathan/ghc,GaloisInc/halvm-ghc,lukexi/ghc-7.8-arm64,snoyberg/ghc,fmthoma/ghc,ezyang/ghc,ml9951/ghc,mcschroeder/ghc,gridaphobe/ghc,da-x/ghc,GaloisInc/halvm-ghc,elieux/ghc,gcampax/ghc,christiaanb/ghc,fmthoma/ghc,TomMD/ghc,frantisekfarka/ghc-dsi,christiaanb/ghc,ryantm/ghc,siddhanathan/ghc,gridaphobe/ghc,ml9951/ghc,holzensp/ghc,sgillespie/ghc,tibbe/ghc,mcschroeder/ghc,gcampax/ghc,jstolarek/ghc,lukexi/ghc,shlevy/ghc,ghc-android/ghc,mfine/ghc,tibbe/ghc,jstolarek/ghc,urbanslug/ghc,ghc-android/ghc,GaloisInc/halvm-ghc,vikraman/ghc,wxwxwwxxx/ghc,AlexanderPankiv/ghc,ryantm/ghc,lukexi/ghc-7.8-arm64,mcschroeder/ghc,elieux/ghc,vikraman/ghc,lukexi/ghc,fmthoma/ghc,vTurbine/ghc,ryantm/ghc,hferreiro/replay,holzensp/ghc,nathyong/microghc-ghc,ml9951/ghc,urbanslug/ghc,nathyong/microghc-ghc,ezyang/ghc,lukexi/ghc,jstolarek/ghc,oldmanmike/ghc,mettekou/ghc,shlevy/ghc,ezyang/ghc,hferreiro/replay,snoyberg/ghc,urbanslug/ghc,ghc-android/ghc,hferreiro/replay,siddhanathan/ghc,da-x/ghc,wxwxwwxxx/ghc,mettekou/ghc,spacekitteh/smcghc,siddhanathan/ghc,TomMD/ghc,wxwxwwxxx/ghc,oldmanmike/ghc,mfine/ghc,holzensp/ghc,vTurbine/ghc,ghc-android/ghc,TomMD/ghc,sdiehl/ghc,acowley/ghc,GaloisInc/halvm-ghc,christiaanb/ghc,elieux/ghc,siddhanathan/ghc,nathyong/microghc-ghc,vikraman/ghc,shlevy/ghc,tibbe/ghc,sdiehl/ghc,gridaphobe/ghc,vTurbine/ghc,wxwxwwxxx/ghc,mcschroeder/ghc,TomMD/ghc,ml9951/ghc,gcampax/ghc,TomMD/ghc,vikraman/ghc,ml9951/ghc,nushio3/ghc,tjakway/ghcjvm,mfine/ghc,frantisekfarka/ghc-dsi,GaloisInc/halvm-ghc,green-haskell/ghc,nathyong/microghc-ghc,hferreiro/replay,anton-dessiatov/ghc,mcschroeder/ghc,spacekitteh/smcghc,gcampax/ghc,acowley/ghc,ezyang/ghc,green-haskell/ghc,nkaretnikov/ghc,fmthoma/ghc,nkaretnikov/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,fmthoma/ghc,shlevy/ghc,mettekou/ghc