Unknown symbol error when ghci tries to load package scion

If you add scion to your flags in ~/.cabal/config, and then do the following:

git clone git://github.com/greenrd/scion.git
cd scion
git checkout devel   # DON'T OMIT THIS LINE!!!
cabal install
cd ..
darcs get --lazy http://code.haskell.org/yi/
cd yi

and then make the following change to yi.cabal

           -- requires an unreleased version atm.
 
         if flag (scion)
-          build-depends: ghc == 6.10.*
+          build-depends: ghc >= 6.10.1
           build-depends: ghc-syb
           build-depends: scion
           cpp-options: -DSCION

and then do cabal install, you should get, after some time, when it gets around to compiling yi itself:

Loading package multiset-0.2 ... linking ... done.
Loading package network-bytestring-0.1.2.1 ... linking ... done.
Loading package uniplate-1.4 ... linking ... done.
ghc: /home/greenrd/.cabal/lib/scion-0.1.0.3/ghc-6.12.1/HSscion-0.1.0.3.o: unknown symbol `scionzm0zi1zi0zi3_ScionziTypesziOutline_OutlineDef_con_info'
Loading package scion-0.1.0.3 ... linking ... ghc: unable to load package `scion-0.1.0.3'
cabal: Error: some packages failed to install:
yi-0.6.2.2 failed during the building phase. The exception was:
ExitFailure 1

(I had to make a couple of changes from upstream scion to make scion compile together with yi, and those are in my repository.)

Although, to save time, you probably DON'T need to go to the trouble of trying to compile yi - I'd hazard a guess that the bug occurs in the compilation of scion, not the compilation of yi.

I did "cabal clean" in the scion directory and tried again - same result.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture