#10028: GHC Panic (The Impossible Happened) -------------------------------------+------------------------------------- Reporter: | Owner: archaephyrryx | Status: new Type: bug | Milestone: Priority: normal | Version: 7.4.1 Component: Compiler | Operating System: Unknown/Multiple Keywords: | Type of failure: Compile-time panic,impossible,irrefutable | crash Architecture: x86_64 | Blocked By: (amd64) | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Error message: {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): compiler/rename/RnPat.lhs:535:39-79: Irrefutable pattern failed for pattern gres@(gre : _) }}} Cause: Importing a Module containing a record-syntax defined datatype, hiding one of the record fields, causes the use of the language pragma RecordWildCards to make GHC encounter a fatal error. A minimal reproduction case is attached to this ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10028 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler