#11589: Reexports of wired-in packages don't work. -------------------------------------+------------------------------------- Reporter: ezyang | Owner: ezyang Type: bug | Status: new Priority: high | Milestone: 8.0.1 Component: Compiler | Version: 8.0.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: cabal/cabal09 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1926 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * testcase: => cabal/cabal09 Comment: The problem appears to be when you have something like the following in a cabal file, {{{ library reexported-modules: Data.List.NonEmpty }}} which results in {{{ $ runghc Setup.hs build Building reexport-0.1.0.0... Preprocessing library reexport-0.1.0.0... Preprocessing executable 'foo' for reexport-0.1.0.0... [1 of 1] Compiling Main ( Main.hs, dist/build/foo/foo- tmp/Main.o ) Main.hs:1:1: error:ghc: panic! (the 'impossible' happened) (GHC version 8.1.20160122 for x86_64-unknown-linux): expectJust mkModuleToPkgConf CallStack (from ImplicitParams): error, called at compiler/utils/Maybes.hs:45:27 in ghc:Maybes Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11589#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler