This massive commit is what Simon has been up to for a couple of weeks.

1.  Scoped type variables are in

2.  The typechecker works a bit differently.
    In partiular, the compiler no longer has TcTyVars of
	a different type than TyVars.
    All the 's' and 'flexi' type parameters have vanished from Id, TyVar,
	Type, etc.
    The typchecker monad is now in the IO world (though I didn't get
	around to removing the 's' parameter from the monad, but it's
	no longer used)

    Bottom line: significantly simpler,
		 fewer gratuitous conversions from TcType <-> Type
		 but less type security in the compiler

    There was a reason for doing this now; somehow the 's' stuff
    got in the way of kind inference for scoped type variables
    and I lost patience with it.

3.  Haskell98-style reporting of scope errors; i.e. you only get
    an error if you use a variable that could mean two different things.
    At the same time I did a lot of tidying-up in the renamer.

4.  Mostly-complete fix to the reporting of unused variables, which
    has never worked properly.  (The 'mostly' bit is because it reports
    those 'system' tycons like _C as unused.  I'm on the job.)

5.  The parser is a bit tider than it was.  A few more ugn files give
    a more refined C data type.  I had to tackle this because of
    the scoped type variables.

6.  Haskell98-style fixities.  Fixity decls can occur wherever a type
    signature can

7.  Some HsSyn changes that constitute minor tidy ups
	Put TypeDecl and ClassDecl into one type [HsDecls]
	Improved the HsMatch/GRHSs etc data types.

8.  TcGRHSs is removed; combined into TcMatches.

I DO NOT PROMISE THAT ALL OF THIS WORKS.  It compiles the Prelude,
but I have not tested it more than that.  Stick to 4.01 if you want a
compiler that's sure to work.

Added unpackCStringST - unmarshal C strings promptly

- backout rev 1.11 (spammed rev 1.10)
- slide ghc-4-01 tag forward

Stubs for implementing System.getArgs

Inline PrimOps (inc. _c{call,asm}_GC_): load the arguments into
temporaries early, just in case one of the arguments is in the spot on
the stack where we want to push the return address.

merge from 4.01

bring in correct version

oops, wrong version of gmp.h

Oops, accidentally downgraded these files in the previous commit.

update

Move 4.01 onto the main trunk.

don't include the non-conflict files that CVS leaves behind in the build tree

add simple IORef test.

4.01 update

Merge from HEAD

Re-install hack which fixes 'leading underscore' feature test under cygwin32

Emit soothing msg to counter the (harmless) autoconf warning that is output while processing AC_C_BIGENDIAN

Extend hConnectTo to also allow output handles to be connected, i.e.,

    h1 <- openFile "foo" WriteMode
    h2 <- openFile "bar" WriteMode
    hConnectTo h1 h2

  will cause h1's buffer to be flushed when h2's buffer overflows
  (and it is just about to be flushed.) The implementation is currently
  not as lazy as that, it flushes h1's buffer regardless of whether h2's
  buffer overflows or not.

  This is used to connect 'stderr' and 'stdout', i.e., output on
  'stderr' will now cause 'stdout' output to (first) be flushed.

Default GhcReportCompiles to NO

Added {TEXT,DATA}_SECTION_MARKER_DECL

Added f-checks for symlink() and readlink()

Distinguish between defn and use of etext and end syms; they're not
the same on platforms where we have to resort to asm labels.

Added tests required by Hugs

update tests for 4.00

Cleaned up the handling of the default calling conventions for 'foreign' decls

Relax restriction that 'foreign import' has got to be an IO action

Allow 'foreign import' calling conv. to be optional

oops, <windows.h> shouldn't be included unconditionally

Fixed endian bug that struck when outputting on non-buffered handles

do&where interaction tests

_casm_ unfolding test

fixed _casm_ ppr glitch

Provide RTS initialisation as sep. entry point, initRTS()

avoid uncessary gcc warning

Added {read,write}StablePtrOffAddr

First take at 'foreign label's

include 'foreign export' prototypes in generated .c file

corrected Prelude home for {W,I}64

primOpInfo WriteOffAddrOp fixed

Added ioOkDataCon_NAME