Sigh. My Windows build is broken. See below. Any ideas? The stage2 complier in non-interactive mode works ok. It’s just ghci fails. What does “Not x86_64 PEi386” mean? What can I do to fix? I should say that my laptop broke so this is a new Windows machine, presumably with a slightly different config… Simon ./inplace/bin/ghc-stage2 --interactive GHCi, version 7.11.20151117: http://www.haskell.org/ghc/ :? for help ghc-stage2.exe: panic! (the 'impossible' happened) (GHC version 7.11.20151117 for x86_64-unknown-mingw32): loadObj "C:\\code\\HEAD-1\\libraries\\ghc-prim\\dist-install\\build\\HSghc-prim-0.5.0.0.o": failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug ghc-stage2.exe: C:\code\HEAD-1\libraries\ghc-prim\dist-install\build\HSghc-prim-0.5.0.0.o: Not x86_64 PEi386 /cygdrive/c/code/HEAD-1$