urk! lookup local fingerprint

When building GHC 8.6.0-alpha2 the build fails with the following error.

[ghc-8.6.0.20180714] alan% make
===--- building phase 0
make --no-print-directory -f ghc.mk phase=0 phase_0_builds
make[1]: Nothing to be done for 'phase_0_builds'.
===--- building phase 1
make --no-print-directory -f ghc.mk phase=1 phase_1_builds
make[1]: Nothing to be done for 'phase_1_builds'.
===--- building final phase
make --no-print-directory -f ghc.mk phase=final all
"inplace/bin/ghc-stage2" -hisuf dyn_hi -osuf  dyn_o -hcsuf dyn_hc -fPIC -dynamic  -H32m -O -Wall      -hide-all-packages -i -iutils/haddock/driver -iutils/haddock/haddock-api/src -iutils/haddock/haddock-library/src -iutils/haddock/dist/build -Iutils/haddock/dist/build -iutils/haddock/dist/build/haddock/autogen -Iutils/haddock/dist/build/haddock/autogen    -optP-DIN_GHC_TREE -optP-include -optPutils/haddock/dist/build/haddock/autogen/cabal_macros.h -package-id Cabal-2.3.0.0 -package-id array-0.5.2.0 -package-id base-4.12.0.0 -package-id bytestring-0.10.8.2 -package-id containers-0.6.0.1 -package-id deepseq-1.4.4.0 -package-id directory-1.3.3.0 -package-id filepath-1.4.2 -package-id ghc-8.6.0.20180714 -package-id ghc-boot-8.6.0.20180714 -package-id parsec-3.1.13.0.0.0.0.0 -package-id text-1.2.3.0 -package-id transformers-0.5.5.0 -package-id xhtml-3000.2.2.1 -funbox-strict-fields -Wall -fwarn-tabs -O2 -threaded -XHaskell2010  -no-user-package-db -rtsopts  -Wno-unused-imports -Wno-deprecations     -Wnoncanonical-monad-instances  -odir utils/haddock/dist/build -hidir utils/haddock/dist/build -stubdir utils/haddock/dist/build    -c utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Types.hs -o utils/haddock/dist/build/Haddock/Backends/Hyperlinker/Types.dyn_o
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 8.6.0.20180714 for powerpc64-unknown-linux):
        urk! lookup local fingerprint
  $fEqTokenDetails
  [cESf79 :-> (Span, 3bafa1c9fb27c5bcc8d6a0fca267f340)]
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/utils/Outputable.hs:1164:37 in ghc:Outputable
        pprPanic, called at compiler/iface/MkIface.hs:523:37 in ghc:MkIface

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

make[1]: *** [utils/haddock/ghc.mk:20: utils/haddock/dist/build/Haddock/Backends/Hyperlinker/Types.dyn_o] Error 1
make: *** [Makefile:127: all] Error 2

Trac metadata

Trac field	Value
Version	8.4.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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