#8946: Using hdevtools caused "Evaluated the place holder for a PostTcKind" ----------------------------------+--------------------------------- Reporter: tbelaire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.1-rc1 Keywords: | Operating System: MacOS X Architecture: x86_64 (amd64) | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+--------------------------------- I was tying to get hdevtools to work, and cloned it and pulled in a bunch of the open pull requests. You can see the state it's in at github.com/tbelaire/hdevtools. {{{ git clone git@github.com:tbelaire/hdevtools cd hdevtools cabal sandbox init cabal install cd .. }}} I could not reproduce the problem on a small test file, so I'm afraid I'll have to demonstrate it on my vinyl-json package. {{{ git clone git@github.com:tbelaire/vinyl-json cd vinyl-json/ cabal sandbox init cabal install hdevtools type src/Data/Vinyl/JSON.hs 42 15 panic! (the 'impossible' happened) (GHC version 7.8.20140130 for x86_64-apple-darwin): Evaluated the place holder for a PostTcKind Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I also get hpc has closed due to a problem a lot when compiling things, but I think that's unrelated. The dynamic lib seems to be gone. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8946 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler