HSpec.Core build fails with stack

[joycse06]

Command: stack build --test
Error Message:

Configuring hspec-core-2.4.4...
Building hspec-core-2.4.4...
Preprocessing library hspec-core-2.4.4...
[ 1 of 22] Compiling Test.Hspec.Core.Timer ( src/Test/Hspec/Core/Timer.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Timer.o )
[ 2 of 22] Compiling Test.Hspec.Core.Compat ( src/Test/Hspec/Core/Compat.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Compat.o )
[ 3 of 22] Compiling Test.Hspec.Core.Formatters.Free ( src/Test/Hspec/Core/Formatters/Free.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Formatters/Free.o )
[ 4 of 22] Compiling Test.Hspec.Core.Util ( src/Test/Hspec/Core/Util.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Util.o )
[ 5 of 22] Compiling Test.Hspec.Core.QuickCheckUtil ( src/Test/Hspec/Core/QuickCheckUtil.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/QuickCheckUtil.o )
[ 6 of 22] Compiling Test.Hspec.Core.Example ( src/Test/Hspec/Core/Example.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Example.o )
[ 7 of 22] Compiling Test.Hspec.Core.Tree ( src/Test/Hspec/Core/Tree.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Tree.o )
[ 8 of 22] Compiling Test.Hspec.Core.Spec.Monad ( src/Test/Hspec/Core/Spec/Monad.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Spec/Monad.o )
[ 9 of 22] Compiling Test.Hspec.Core.Hooks ( src/Test/Hspec/Core/Hooks.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Hooks.o )
[10 of 22] Compiling Test.Hspec.Core.Spec ( src/Test/Hspec/Core/Spec.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Spec.o )
[11 of 22] Compiling Test.Hspec.Core.Formatters.Monad ( src/Test/Hspec/Core/Formatters/Monad.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Formatters/Monad.o )
[12 of 22] Compiling Test.Hspec.Core.Formatters.Internal ( src/Test/Hspec/Core/Formatters/Internal.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Formatters/Internal.o )
[13 of 22] Compiling Test.Hspec.Core.QuickCheck ( src/Test/Hspec/Core/QuickCheck.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/QuickCheck.o )
[14 of 22] Compiling Paths_hspec_core ( .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/autogen/Paths_hspec_core.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Paths_hspec_core.o )
[15 of 22] Compiling Data.Algorithm.Diff ( vendor/Data/Algorithm/Diff.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Data/Algorithm/Diff.o )
[16 of 22] Compiling Test.Hspec.Core.Formatters.Diff ( src/Test/Hspec/Core/Formatters/Diff.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Formatters/Diff.o )
[17 of 22] Compiling Test.Hspec.Core.Formatters ( src/Test/Hspec/Core/Formatters.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Formatters.o )
[18 of 22] Compiling Test.Hspec.Core.Options ( src/Test/Hspec/Core/Options.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/Options.o )
[19 of 22] Compiling Test.Hspec.Core.FailureReport ( src/Test/Hspec/Core/FailureReport.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Test/Hspec/Core/FailureReport.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.2 for x86_64-apple-darwin):
	get IfaceTyLit 7

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

[mankyKitty]

As part of f69fc1b we expanded the version bounds for hspec. It is building without error on our CI system and locally. So I'm going to close this, unless of course it rears its head again.

Sorry about the bother in the interim.