[GHC] #6072: Irrefutable pattern error while compiling GHC

[GHC]

#6072: Irrefutable pattern error while compiling GHC
------------------------------+---------------------------------------------
 Reporter:  sjoerd_visscher   |          Owner:                
     Type:  bug               |         Status:  new           
 Priority:  normal            |      Component:  Build System  
  Version:  7.5               |       Keywords:                
       Os:  Unknown/Multiple  |   Architecture:  x86_64 (amd64)
  Failure:  None/Unknown      |       Testcase:                
Blockedby:                    |       Blocking:                
  Related:                    |  
------------------------------+---------------------------------------------
 While doing "make" on GHC HEAD I got this error:

 "inplace/bin/ghc-stage1" -prof  -H32m -O    -package-name ghc-7.5.20120503
 -hide-all-packages -i -icompiler/basicTypes -icompiler/cmm
 -icompiler/codeGen -icompiler/coreSyn -icompiler/deSugar -icompiler/ghci
 -icompiler/hsSyn -icompiler/iface -icompiler/llvmGen -icompiler/main
 -icompiler/nativeGen -icompiler/parser -icompiler/prelude
 -icompiler/profiling -icompiler/rename -icompiler/simplCore
 -icompiler/simplStg -icompiler/specialise -icompiler/stgSyn
 -icompiler/stranal -icompiler/typecheck -icompiler/types -icompiler/utils
 -icompiler/vectorise -icompiler/stage2/build
 -icompiler/stage2/build/autogen -Icompiler/stage2/build
 -Icompiler/stage2/build/autogen -Icompiler/../rts/dist/build
 -Icompiler/stage2 -Icompiler/. -Icompiler/parser -Icompiler/utils   -optP-
 DGHCI -optP-include -optPcompiler/stage2/build/autogen/cabal_macros.h
 -package Cabal-1.14.0 -package array-0.3.0.3 -package base-4.5.0.0
 -package bin-package-db-0.0.0.0 -package bytestring-0.10.0.0 -package
 containers-0.5.0.0 -package directory-1.1.0.1 -package filepath-1.2.0.1
 -package hoopl-3.8.7.2 -package hpc-0.5.1.0 -package process-1.1.0.0
 -package template-haskell-2.6.0.0 -package time-1.4 -package unix-2.5.1.0
 -Wall -fno-warn-name-shadowing -fno-warn-orphans -XHaskell98
 -XNondecreasingIndentation -XCPP -XMagicHash -XUnboxedTuples
 -XPatternGuards -XForeignFunctionInterface -XEmptyDataDecls
 -XTypeSynonymInstances -XMultiParamTypeClasses -XFlexibleInstances
 -XRankNTypes -XScopedTypeVariables -XDeriveDataTypeable -XBangPatterns
 -DGHCI_TABLES_NEXT_TO_CODE -DSTAGE=2 -O2  -no-user-package-conf -rtsopts
 -odir compiler/stage2/build -hidir compiler/stage2/build -stubdir
 compiler/stage2/build -hisuf p_hi -osuf  p_o -hcsuf p_hc -c
 compiler/main/HscMain.hs -o compiler/stage2/build/HscMain.p_o
 ghc-stage1: panic! (the 'impossible' happened)
   (GHC version 7.5.20120503 for x86_64-apple-darwin):
         compiler/simplCore/SimplUtils.lhs:1668:5-25: Irrefutable pattern
 failed for pattern ((_, _, rhs1) : _)


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

 make[1]: *** [compiler/stage2/build/HscMain.p_o] Error 1
 make: *** [all] Error 2

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6072>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler