Print out rational literals correctly in External Core
Print out rational literals correctly in External Core

The External Core printer was printing out rational literals of the
form: 
2.0e-2
when the External Core grammar doesn't allow this. (This
bug has apparently been there since the beginning...)

It's now printing rationals in the same form that (show (r::Rational))
does. This requires a parser change as well (soon to come.)

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