GHCi doesn't load project.
I got the following output when trying to load my Haskell project into GHCi using stack:
GHCi, version 8.2.2: http://www.haskell.org/ghc/ :? for help ghc: panic! (the 'impossible' happened) (GHC version 8.2.2 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc3372_0/libghc_13.so: undefined symbol: numStates_g Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
No other informative output was displayed. Output says report the defect, so you get a "bug report."