angie-0.0.0: configureConfiguring angie-0.0.0...angie-0.0.0: buildPreprocessing library angie-0.0.0...[ 8 of 11] Compiling Handler.Home ( Handler/Home.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.0.0/build/Handler/Home.o )ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): find_tycon Block []Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug-- While building package angie-0.0.0 using: /home/haiwei/.stack/setup-exe-cache/x86_64-linux/setup-Simple-Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.24.0.0 build lib:angie exe:angie --ghc-options " -ddump-hi -ddump-to-file" Process exited with code: ExitFailure 1