#13017: GHC panics during build of etkmett/free -------------------------------------+------------------------------------- Reporter: jbayardo | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- While using stack, I get the following error: {{{ -- While building package free-4.12.4 using: /home/user/.stack/setup-exe-cache/x86_64-linux/Cabal- simple_mPHDZzAJ_1.24.0.0_ghc-8.0.1 --builddir=.stack- work/dist/x86_64-linux/Cabal-1.24.0.0 build --ghc-options " -ddump-hi -ddump-to-file" Process exited with code: ExitFailure 1 Logs have been written to: /home/user/dev/haskellito/.stack- work/logs/free-4.12.4.log Configuring free-4.12.4... Building free-4.12.4... Preprocessing library free-4.12.4... [ 1 of 16] Compiling Control.Monad.Free.TH ( src/Control/Monad/Free/TH.hs, .stack- work/dist/x86_64-linux/Cabal-1.24.0.0/build/Control/Monad/Free/TH.o ) [ 2 of 16] Compiling Control.Monad.Free.Class ( src/Control/Monad/Free/Class.hs, .stack- work/dist/x86_64-linux/Cabal-1.24.0.0/build/Control/Monad/Free/Class.o ) [ 3 of 16] Compiling Control.Monad.Trans.Iter ( src/Control/Monad/Trans/Iter.hs, .stack- work/dist/x86_64-linux/Cabal-1.24.0.0/build/Control/Monad/Trans/Iter.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): Ix{Int}.index: Index (16777216) out of range ((0,392)) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13017 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler