Warn about unused pattern bindings
Warn about unused pattern bindings

Fixes Trac #7085

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