#2011: [6.8.1 regression] panic: lookupVers1 base:GHC.Prim sym{tc}
-------------------------+--------------------------------------------------
Reporter: simonmar | Owner: simonpj
Type: bug | Status: new
Priority: high | Milestone: 6.8.3
Component: Compiler | Version: 6.8.2
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: Unknown | Os: Unknown
-------------------------+--------------------------------------------------
When rebuilding the base package you might encounter this:
{{{
../../compiler/stage1/ghc-inplace -package-name base-3.0.1.0 -hide-all-
packages -split-objs -i -idist/build/autogen -idist/build -i. -Idist/build
-Iinclude -#include "HsBase.h" -odir dist/build -hidir dist/build -stubdir
dist/build -package rts-1.0 -O -fglasgow-exts -package-name base -XCPP
-idist/build -H16m -O -O -Rghc-timing -fgenerics -c
Data/Generics/Twins.hs -o dist/build/Data/Generics/Twins.o -ohi
dist/build/Data/Generics/Twins.hi
ghc-6.8.2: panic! (the 'impossible' happened)
(GHC version 6.8.2 for powerpc-apple-darwin):
lookupVers1 base:GHC.Prim sym{tc}
}}}
Workaround is to clean in `libraries/base`.
The problem is that `MkIface.computeChangedOccs` needs to avoid wired-in
names when checking version numbers, because wired-in names are never
mentioned in usages.
I believe simonpj has a patch for this in his working tree, we diagnosed
it before disappearing for the Christmas period.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2011>
GHC <http://www.haskell.org/ghc/>
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