#11283: PatternSynonms and DisambiguateRecordFields causes panic -------------------------------------+------------------------------------- Reporter: adamgundry | Owner: adamgundry Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.11 Keywords: | Operating System: Unknown/Multiple PatternSynonyms | Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: #9975 Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The following module causes a panic in HEAD: {{{#!hs {-# LANGUAGE PatternSynonyms, DisambiguateRecordFields #-} data P a = MkP a pattern S{x} = MkP x e = S{x = 3} }}} {{{ ghc-stage2: panic! (the 'impossible' happened) (GHC version 7.11.20151223 for x86_64-unknown-linux): find_tycon S [S pattern synonym defined at PatSynBug.hs:3:1] }}} This is essentially the same bug as #9975; for some reason it became slightly harder to tickle. Fix incoming. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11283 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler