#14382: The 'impossible' happened whilst installing gi-gtk via cabal ----------------------------------+-------------------------------------- Reporter: maartenjacobs | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: gtk, pango Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | ----------------------------------+-------------------------------------- Comment (by simonpj): I have no idea how to reproduce this. {{{ bash$ cabal unpack gi-pango-1.0.15 bash$ cd gi-pango-1.0.15 bash$ cabal install --with- ghc=/home/simonpj/5builds/ghc-8.2-branch/inplace/bin/ghc-stage2 Resolving dependencies... cabal: Could not resolve dependencies: trying: gi-pango-1.0.15 (user goal) next goal: haskell-gi (dependency of gi-pango-1.0.15) rejecting: haskell-gi-0.20.3, haskell-gi-0.20.2, haskell-gi-0.20.1 (conflict: requires pkg-config package gobject-introspection-1.0>=1.32, not found in the pkg-config database) rejecting: haskell-gi-0.20, haskell-gi-0.18, haskell-gi-0.17.4, haskell-gi-0.17.3, haskell-gi-0.17.2, haskell-gi-0.17.1, haskell-gi-0.17, haskell-gi-0.15, haskell-gi-0.14, haskell-gi-0.13, haskell-gi-0.12, haskell-gi-0.11, haskell-gi-0.10.2, haskell-gi-0.10.1, haskell-gi-0.10, haskell-gi-0.9, haskell-gi-0.8 (conflict: gi-pango => haskell-gi>=0.20.1 && <1) Dependency tree exhaustively searched. }}} Moreover there seem be no source files. Try building compiler with `-DDEBUG` and add `HasDebugCallStack` to `tcIfaceGlobal`. In the panic in `tcIfaceGlobal` get hold of the `if_loc` field of the `IfLclEnv` and add that to the error message. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14382#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler