Improve documentation of the way that defaulting to IO happens in GHCi
Improve documentation of the way that defaulting to IO happens in GHCi

Thanks to John Hughes for the suggestion.

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