#7900: The impossible happend -----------------------------+---------------------------------------------- Reporter: dhjdhj | Owner: Type: bug | Status: new Priority: normal | Component: Compiler Version: 7.4.2 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: None/Unknown | Blockedby: Blocking: | Related: -----------------------------+---------------------------------------------- ghc: panic! (the 'impossible' happened) (GHC version 7.4.2 for x86_64-apple-darwin): compiler/rename/RnSource.lhs:430:14-81: Irrefutable pattern failed for pattern Data.Maybe.Just (inst_tyvars, _, SrcLoc.L _ cls, _) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7900 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler