#12944: ghc master (8.1.20161206) panics with assertion failure with devel2 flavor and -O -------------------------------------+------------------------------------- Reporter: pacak | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.1 (CodeGen) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * priority: normal => highest * component: Compiler => Compiler (CodeGen) * milestone: => 8.2.1 Comment: I can also reproduce this with 9bcc4e335b34c00191e8897aa7393c3856e8996f, {{{ $ ghc -O ~/hi.hs [1 of 1] Compiling Numeric.Polynomial.Log ( /home/ben/hi.hs, /home/ben/hi.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.1.20161207 for x86_64-unknown-linux): StgCmmEnv: variable not found $dAdditiveGroup_aIP local binds for: *^ ^+^ negateV ^-^ $p1VectorSpace $fAdditiveGroupPoly1 $WIntOfLog $fAdditiveGroupIntOfLog_$cnegateV $fAdditiveGroupIntOfLog_$c^+^ $fAdditiveGroupPoly1_$c^-^ $fAdditiveGroupPoly1_$cnegateV $fAdditiveGroupPoly1_$c^+^ w_s12P ww_s12Q ww1_s12R ww2_s12S ww3_s12T dt_s12U Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1116:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1120:37 in ghc:Outputable pprPanic, called at compiler/codeGen/StgCmmEnv.hs:137:9 in ghc:StgCmmEnv Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12944#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler