#8273: ghc: panic! (the 'impossible' happened) -------------------------+------------------------------------------------- Reporter: | Owner: ready2go | Status: new Type: bug | Milestone: Priority: | Version: 7.4.1 normal | Operating System: Unknown/Multiple Component: | Type of failure: None/Unknown Compiler | Test Case: Prelude> data Shape = Keywords: | Circle Float Float Float | Rectangle Float Architecture: | Float Float Float deriving (show) x86_64 (amd64) | Blocking: Difficulty: | Unknown | Blocked By: | Related Tickets: | -------------------------+------------------------------------------------- Prelude> data Shape = Circle Float Float Float | Rectangle Float Float Float Float deriving (show) ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): nameModule show{tv a9J} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug My Apologies if this is a duplicate, first time I have used trac, or this system- reproduced fault twice from fresh start of GHCi it twice on my Ubuntu 12.04 LTS system, using Haskell platform from Ubuntu repository -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8273 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler