Fix bug in boxySplitTyConApp
Fix bug in boxySplitTyConApp

Merge to STABLE branch

This bug was discovered by Nicolas Frisby.  It's an egregious missing guard
in boxySplitTyConApp.

Test is tcfail180


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