#13910: Inlining a definition causes GHC to panic (repSplitTyConApp_maybe) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.2.1-rc2 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: 14119 | Blocking: Related Tickets: #13877, #14038 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Humorously enough, the panic is now different on GHC HEAD (likely due to commit a6c448b403dbe8720178ca82100f34baedb1f47e, `Small refactor of getRuntimeRep`): {{{ $ ghc4/inplace/bin/ghc-stage2 --interactive Bug.hs GHCi, version 8.3.20170828: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci [1 of 1] Compiling Bug ( Bug.hs, interpreted ) ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.3.20170828 for x86_64-unknown-linux): getRuntimeRep (f_a5yC[sk:2] |> Sym (Sym (D:R:Funk1:->k2[0] <k1_a5n2>_N <k2_a5n3>_N) ; D:R:Funk1:->k2[0] <t1_a5yB[sk:2]>_N <*>_N)) a_a5yD[sk:2] :: k2_a5n3 Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1138:37 in ghc:Outputable pprPanic, called at compiler/types/Type.hs:1982:18 in ghc:Type }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13910#comment:3> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler