#13017: GHC panics during build of etkmett/free -------------------------------------+------------------------------------- Reporter: jbayardo | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by jbayardo: @@ -34,0 +34,4 @@ + + This reproduced even with a clean ~/.stack (this includes downloading the + GHC binaries again), and the only necessary condition to reproduce for me + was having lens as a dependency. New description: 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 }}} This reproduced even with a clean ~/.stack (this includes downloading the GHC binaries again), and the only necessary condition to reproduce for me was having lens as a dependency. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13017#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler