#15443: ghc panic when running GI.init on intero REPL --------------------------------------+------------------------------- Reporter: esclerofilo | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: GHCi | Version: 8.4.3 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: GHCi crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+------------------------------- I cloned the [https://github.com/haskell-gi/gi-gtk-examples] repo to learn to use gi-gtk, deleted all version numbers in the .cabal file to make it build with the latest stack resolver (lts-12.2) and then opened ButtonBox.hs in emacs (spacemacs) with intero, opened the intero repl (without actually loading the buffer into the repl*) and what happened follows: {{{ Starting: stack ghci --with-ghc ghci "--docker-run-args=--interactive=true --tty=false" --no-build --no-load gi-gtk-examples GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/vicente/Escritorio/gi-gtk-examples /.stack-work/intero/intero-scriptBbJ8Bq λ import qualified GI.Gtk as GI (main, init) λ GI.init Nothing ghc: panic! (the 'impossible' happened) (GHC version 8.4.3 for x86_64-unknown-linux): nameModule system $dShow_a8qH Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable pprPanic, called at compiler/basicTypes/Name.hs:241:3 in ghc:Name Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} the contents of {{{/home/vicente/Escritorio/gi-gtk-examples/.stack- work/intero/intero-scriptBbJ8Bq}}} are: {{{ :set prompt "" :set -fbyte-code :set -fdefer-type-errors :set -fdiagnostics-color=never :set prompt "\4 " }}} Note: It happens on a terminal ghci invocation too, given the same parameters and configuration. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15443 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler