#8632: ghc: panic! (the 'impossible' happened) ----------------------------------+--------------------------------------- Reporter: jdoliner | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.4.1 Keywords: | Operating System: Unknown/Multiple Architecture: x86_64 (amd64) | Type of failure: Compile-time crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+--------------------------------------- I got this message when trying to compile. It appears to be reproducible. Also I realize this is an outdate version of GHC so I'm going to update and see if it fixes itself. (GHC version 7.4.1 for x86_64-unknown-linux): compiler/rename/RnSource.lhs:429:14-81: Irrefutable pattern failed for pattern Data.Maybe.Just (inst_tyvars, _, SrcLoc.L _ cls, _) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8632 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler