WOOHOO!  GHCi interprets "Hello World":

 _____  __   __  ____         _________________________________________________
(|      ||   || (|  |)        GHC Interactive, version 5.00
||  __  ||___|| ||     ()     For Haskell 98.
||   |) ||---|| ||     ||     http://www.haskell.org/ghc
||   || ||   || ||     (|     Bug reports to: glasgow-haskell-bugs@haskell.org
(|___|| ||   || (|__|) \\______________________________________________________

Loading package std ... resolving ... done.
Prelude> :l Main
cmLoadModule: downsweep begins
getSummary: Main
after tsort:

NONREC
   ModSummary { ms_mod = Main, ms_imps = [] ms_srcimps = [] }
CHECKING OLD IFACE for hs = Just "./Main.hs", hspp = Just "/tmp/ghc25011.hspp"
COMPILATION IS REQUIRED
UPSWEEP COMPLETELY SUCCESSFUL
CmLink.link: linkables are ...
LinkableM Main [Trees [Main.main = letP stg_cIM = (@PP Native PrelShow.$fShow[] Native PrelShow.$fShowChar)
                                   in
                                   letP stg_cIL = (@IP Native PrelBase.unpackCString# 141613256#)
                                   in
                                   (@PP (@PP Native PrelIO.print stg_cIM) stg_cIL)]]
Main.main
CmLink.link: done
Prelude> Main.main
Run expression: Main.main
evalI:
141613256#

"Hello, world!"
done.