building head fails with: ghci/DebuggerTys.hs:49:60: Not in scope: `unknownTyConName'

[Simon Marlow]

Claus Reinke wrote:
> ../compiler/stage1/ghc-inplace -H32m -O2  -istage2/utils  
> -istage2/basicTypes  -istage2/types  -istage2/hsSyn  -istage2/prelude  
> -istage2/rename  -istage2/typecheck  -istage2/deSugar  -istage2/coreSyn  
> -istage2/specialise  -istage2/simplCore  -istage2/stranal  
> -istage2/stgSyn  -istage2/simplStg  -istage2/codeGen  -istage2/main 
>  -istage2/profiling  -istage2/parser  -istage2/cprAnalysis  
> -istage2/ndpFlatten  -istage2/iface  -istage2/cmm  -istage2/nativeGen  
> -istage2/ghci -Istage2 -DGHCI -package template-haskell 
> -DGHCI_TABLES_NEXT_TO_CODE -threaded -cpp -fglasgow-exts -fno-generics 
> -Rghc-timing -I. -Iparser -package Win32 -package Cabal -ignore-package 
> lang -recomp -Rghc-timing  -H16M '-#include "cutils.h"' -package-name  
> ghc-6.7.20070501   -fgenerics    -c ghci/DebuggerTys.hs -o 
> stage2/ghci/DebuggerTys.o  -ohi stage2/ghci/DebuggerTys.hi

You have droppings from a previous build in your tree - DebuggerTys was removed 
recently.

Cheers,
	Simon