id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
7426,import Foo hiding (X) should not be a fatal error when X is not exported by Foo,luqui,,"We recently got into a situation on a team where two developers had two different versions of a module with many exports installed, and we were using a compatible subset of both versions.  I then introduced a symbol (say X) with the same name as an export from one of the versions.  Because GHC raises a fatal error on import Foo hiding (X) when X is not exported by Foo, we had no way to have X refer to the local definition -- since if hiding (X) was present, my GHC would error, and if it wasn't, he would get ambiguous reference errors.  

The alternative would be to list all symbols except X in the import list (there were a good couple hundred).  But isn't that what hiding (X) is supposed to be short for anyway?",bug,closed,normal,,Compiler,7.4.1,duplicate,"module, import",,MacOS X,x86_64 (amd64),GHC rejects valid program,Unknown,,,,