id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,difficulty,ghcversion,platform
594,"Unhelpful error message for ""module found in multiple packages""",Tim <chevalier@…>,,"I was checking whether cabal-install would install my ""extcore"" package, and got:
{{{
$ sudo cabal install extcore --enable-library-profiling --reinstall
Resolving dependencies...
Configuring extcore-0.3...
Preprocessing library extcore-0.3...
Building extcore-0.3...

Language/Core/Core.hs:6:7:
    Could not find module `Data.Generics':
      it was found in multiple packages: base-3.0.3.1 syb
cabal: Error: some packages failed to install:
extcore-0.3 failed during the building phase. The exception was:
exit: ExitFailure 1
}}}

This is an unhelpful error message because it gives the user no information about what they have to do to continue. Since I'm the package author, I was able to figure out that I needed to change the .cabal file to depend on base >= 4. In general, the error message should explain that this is a bug in the package description and to report it to the package maintainer.

cabal-install 0.6.2, library version 1.6.0.3.",enhancement,new,normal,Cabal-2.0,Cabal library,1.6.0.1,normal,,,,project(> week),,