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showMultiLineString is only in >= 7.1.

as well as decommiting it.

In particular, instead of
   Cannot match 'a' with 'b'
we get
   Could not deduce (a~b) from context (F a ~ b)
or whatever

I'm surprised that these haven't caused any problems (or maybe they have?)

We were generating PrimopWrappers.hs twice in two different places,
one for the normal build and one for Haddock (I think).  Unfortunately
one of these was causing extra rebuilding, because the file dropped
into the dist-install/build/autogen directory, where it was picked up
by the automatic HS_SRCS detection in subsequent make runs.  This was
exposed by a recent change to HS_SRCS:

  Wed Oct 20 11:47:59 BST 2010  Ian Lynagh <igloo@earth.li>
    * Look for sources in Cabal's autogen directory too

This should fix the stage3 failures in the build bots.

It now says:

ghc-stage2: sorry! (this is work in progress)
  (GHC version 7.1.20101028 for i386-apple-darwin):
	Vectorise.Builtins.indexBuiltin
    
    DPH builtin function 'sumTyCon' of size '11' is not yet implemented.
    This function does not appear in your source program, but it is needed
    to compile your code in the backend. This is a known, current limitation
    of DPH. If you want it to to work you should send mail to cvs-ghc@haskell.org
    and ask what you can do to help (it might involve some GHC hacking).


I added 'pprSorry' that behaves like 'pprPanic' except it say sorry! instead 
of panic!, and doesn't ask the user to report a bug. 

Also changed exitcode of -1 to 1 in hpc.

It was always secret, and has now vanished as silently as it came

We can remove it altogether in GHC 7.2

A wibble to my previous change in WorkWrap, fixes simplrun010

1. Do eta-expansion at let-bindings, not lambdas.
   I have wanted to do this for a long time.
   See Note [Eta-expanding at let bindings] in SimplUtils

2. Simplify the rather subtle way in which InlineRules (the
   template captured by an INLINE pragma) was simplified.
   Now, these templates are always simplified in "gentle"
   mode only, and only INLINE things inline inside them.

   See Note Note [Gentle mode], Note [Inlining in gentle mode]
   and Note [RULEs enabled in SimplGently] in SimplUtils

Amazingly, there were still Wrong Things in the arity analysis, 
exposed by my fiddling with eta expansion.

I simplified the code, clarified the comments, added more examples,
and tidied it all up.  I hope it's better this time.

This fix ties the knot for recursive groups properly

See Note [Don't w/w INLINABLE things] in WorkWrap

This fixes a bug that Milan found.

While trying to fix #1666 (-Werror aborts too early) I decided to some
tidyup in GHC/DriverPipeline/HscMain.

 - The GhcMonad overloading is gone from DriverPipeline and HscMain
   now.  GhcMonad is now defined in a module of its own, and only
   used in the top-level GHC layer.  DriverPipeline and HscMain
   use the plain IO monad and take HscEnv as an argument.

 - WarnLogMonad is gone.  printExceptionAndWarnings is now called
   printException (the old name is deprecated).  Session no longer
   contains warnings.

 - HscMain has its own little monad that collects warnings, and also
   plumbs HscEnv around.  The idea here is that warnings are collected
   while we're in HscMain, but on exit from HscMain (any function) we
   check for warnings and either print them (via log_action, so IDEs
   can still override the printing), or turn them into an error if
   -Werror is on.

 - GhcApiCallbacks is gone, along with GHC.loadWithLogger.  Thomas
   Schilling told me he wasn't using these, and I don't see a good
   reason to have them.

 - there's a new pure API to the parser (suggestion from Neil Mitchell):
      parser :: String
             -> DynFlags
             -> FilePath
             -> Either ErrorMessages (WarningMessages, 
                                      Located (HsModule RdrName))

See Note [SPECIALISE pragmas] in TcBinds.  Fixes Trac #444.

This patch fixes two bugs in the Mach-O linker and adds debugging statements
to the same. The bugs:

1. The test for symbol->n_value == 0 is removed and replaced by a test of the
flag field.  Checking the n_value field was just wrong; the value of a
symbol should only be examined when allocating space for a common block,
in which case the n_value field gives the size of the block.  This bug
led to an infrequently occuring linker crash.

I believe the behavior of the linker now agrees with the intent of the
sketchy Apple documentation.

2. Jump islands were being filled with garbage instead of the the location
of the referenced symbol. This caused relocations of type X86_64_RELOC_GOT and
X86_64_RELOC_GOT_LOAD to eventually lead to crashes.  The fix is simply to
look up the symbol.

Enough debug statements have been added to follow the operation of the Mach-O
linker while it loads modules.  They are not yet as informative and well
organized as for ELF.  Improving the debug statements will require some
reorganization of the code -- the Mach-O linker seems basically sound, but
is crying out for some refactoring and commenting.
    

findDupsEq is quadratic, whereas removeDups is n log n.
Fixes T1969 regression.