#11120: Missing type representations -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: patch Priority: high | Milestone: 8.0.1 Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1769 Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): This might have been mentioned already (hard to tell, since I don't really understand the technical details here), but it's still possible to trigger GHC panics pretty easily due to (what I assume are) inadequate type representations: {{{ $ inplace/bin/ghc-stage2 --interactive GHCi, version 8.1.20160113: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /nfs/nfs4/home/rgscott/.ghci λ> :set -XTypeInType -XMagicHash λ> :m + Data.Typeable GHC.Prim GHC.Exts λ> data CharHash = CharHash Char# λ> typeOf (Proxy :: Proxy 'CharHash) ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.1.20160109 for x86_64-unknown-linux): tyConRep Char# Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug λ> typeOf (Proxy :: Proxy 'C#) GHC error in desugarer lookup in Ghci2: Can't find interface-file declaration for variable tc'C# Probable cause: bug in .hi-boot file, or inconsistent .hi file Use -ddump-if-trace to get an idea of which file caused the error ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.1.20160109 for x86_64-unknown-linux): initDs IOEnv failure Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11120#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler