[6.8.1 regression] panic: lookupVers1 base:GHC.Prim sym{tc}
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.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.8.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | high |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | Unknown |
| Architecture | Unknown |