Add extra WARN test
Add extra WARN test

This warning tests that the arity of a function does not decrease.
And that it's at least as great as the strictness signature.

Failing this test isn't a disater, but it's distinctly odd and 
usually indicates that not enough information is getting propagated
around, and hence you may get more simplifier iterations.


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