#14898: Panic with repSplitAppTys -------------------------------------+------------------------------------- Reporter: ryanreich | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: duplicate | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: #13819 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: infoneeded => closed * resolution: => duplicate * related: => #13819 Comment: Now that you mention it, despite ryanreich's message to the contrary, that code alone //does// panic on GHC 8.2.1 when put into its own module: {{{ $ /opt/ghc/8.2.1/bin/ghci Bug.hsGHCi, version 8.2.1: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci [1 of 1] Compiling Main ( Bug.hs, interpreted ) ghc: panic! (the 'impossible' happened) (GHC version 8.2.1 for x86_64-unknown-linux): repSplitAppTys a_a1Ah[sk:1] ReaderT r_a1Ag[sk:1] m_a1Af[sk:1] b_a1Ai[sk:1] [] Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1133:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in ghc:Outputable pprPanic, called at compiler/types/Type.hs:808:9 in ghc:Type }}} But does not with 8.2.2, as sighingnow noted in comment:5. So this really is a duplicate of #13819. Hooray! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14898#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler