Fix warnings in HsImpExp.lhs
Fix warnings in HsImpExp.lhs

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