ghc-stage2 --interactive GHCi, version 7.11.20151104: http://www.haskell.org/ghc/ :? for help Prelude> :set -package ghc -- THIS IS THE KEY LINE
Hi devs, I spent some of my time at Hac Phi this past weekend teaching a few people the ropes about GHC hacking. One innocently asked if it's possible to load GHC into GHCi. I shuddered at the thought. But, actually, you can get quite close to this ideal: package flags have changed, resetting and loading new packages... Prelude> import TcMType Prelude TcMType> :t newEvVar newEvVar :: forall gbl lcl. TcType.TcPredType -> TcRnTypes.TcRnIf gbl lcl Var.EvVar Prelude TcMType> Pretty cool, huh? This improves my life. Hopefully it improves yours, too. Richard PS: Can anyone recommend a place on the wiki where I should put this?