Allow mkWeak# to take an unlifted type as the key argument.  The
intention is that boxed-but-unlifted types can be used as keys, not
unlifted types in general but there's no way to enforce this at the
moment.

+RTS -s<blah>  ==>  +RTS -S<blah>

for -Rghc-timing.  The former now gives only summary statistics, as
advertised.

If calling a 'foreign export'ed Haskell function resulted in an error,
localise the error by supplying the module name as well as the name
of the function.

Improve the UI a little for modules contain 'foreign export' declarations -
no longer demand that module name == (basename filename)

Something is very screwy here.  This file does not appear to have been
removed, but it doesn't have any tags beyond 2.04.

Back out yesterday's change to Parser.y, and throw out illegal do
expressions in the renamer instead.  It turned out to be hard to get
the optional semicolons right in the grammar at the same time as
checking that the last statement is an expression.

Add a bit more info about hi-boot files

Do a more correct job of explicit for-alls in types

Add rnfail018

Remove some unused things.

Adopt the following syntax for stmts:

	stmts  -> stmt1 ; ... stmtn ; exp [;]

That is, a do-notation thing must finish with an expression.

Add read009, do-notation

Make Type.isUnLiftedType return True for forall'd unlifted types:
e.g.	x :: forall a. Int#

I found bindings like these were getting floated to the top level.
They are pretty bogus types, mind you.  It would be better never to
construct them.

(George Russell tripped over this one.)

* Fix a bug in the unifier that made the typechecker
  loop on a 5-line program from Sigbjorn.  The bug is
  documented near the fix, in

	TcUnify.uUnboundVar

Add rnfail017

Fix type in tcMatch discovered by Keith

Add tc102

Remove dead token IThash added yesterday by mistake.

Fix use of _unused var for ghc-3.XX.

cpp-ify some H98isms with PSEQ and SAPPLY to placate ghc-3.0X

* Fix a bug in the unifier that made the typechecker
  loop on a 5-line program from Sigbjorn.  The bug is
  documented near the fix, in

	TcUnify.uUnboundVar

Add tc101

Fix trivial parse errors.

More 64bit fun: Fixed an ill-placed #ifdef and added a cast to a
numeric literal (for explanation see yesterday's fix).

Layout fix to uses of ASSERT in do expressions; thanks Kevin for
pointing out the problem.

More 64bit fun: Fixed an ill-placed #ifdef and added a cast to a
numeric literal (for explanation see yesterday's fix).

* Fix long-standing bug in TcIfaceSig which meant it occasionally complained
  about a lint error in an unfolding, with a locally-defined name not
  being in scope.   This only happened when hi-boot loops were being
  tied, so an unfolding might mention a locally-defined name.

* Fix trivial bug in WwLib.mkWWfixup, 
  which showed up when booting the compiler.

More small portability changes:
   * For older GHCs use IOBase instead of PrelIOBase
   * Never use commas in SLIT. cpp IS a hack for Haskell...

Patched my previous patch ($ vs $$, && vs if/then/fi). Installing a
Happy binary-dist still only creates a happy and no happy-1.6
executable, but this has very probably nothing to do with my changes.

Two checks for empty file lists added.

We have to be very careful with numeric literals in the C part, in
this case 0xff (of type int = 4 bytes on Alpha) was shifted left 56
times => always zero  :-{  Using an L or UL suffix is not always
practical, because the needed size depends on conditional typedefs
somewhere else. Solution: Cast!  :-P  ghc/includes contains some more
suspicious literals, but I did not have a look at them yet.

This commit makes a start at implementing polymorphic usage
annotations.

* The module Type has now been split into TypeRep, containing the
  representation Type(..) and other information for `friends' only,
  and Type, providing the public interface to Type.  Due to a bug in
  the interface-file slurping prior to ghc-4.04, {-# SOURCE #-}
  dependencies must unfortunately still refer to TypeRep even though
  they are not friends.

* Unfoldings in interface files now print as __U instead of __u.
  UpdateInfo now prints as __UA instead of __U.

* A new sort of variables, UVar, in their own namespace, uvName, has
  been introduced for usage variables.

* Usage binders __fuall uv have been introduced.  Usage annotations
  are now __u - ty (used once), __u ! ty (used possibly many times),
  __u uv ty (used uv times), where uv is a UVar.  __o and __m have
  gone.  All this still lives only in a TyNote, *for now* (but not for
  much longer).

* Variance calculation for TyCons has moved from
  typecheck/TcTyClsDecls to types/Variance.

* Usage annotation and inference are now done together in a single
  pass.  Provision has been made for inferring polymorphic usage
  annotations (with __fuall) but this has not yet been implemented.
  Watch this space!

No more RAWCPP, thank you.

Use +RTS -S<file> rather than +RTS -s<file>, since the latter only
gives summary statistics now.

A prime example of how an inconsistent .hi-boot file can really ruin
your day: the definition of CoreRules in CoreSyn.hi-boot was out of
sync with the real one, which meant that the compiler generated the
wrong code for a `seq` on something of type CoreRules.

oops, forgot to commit this yesterday.

RAWCPP is now '$(CPP) -undef -traditional'.

[Simon: this should fix that -funfolding-use-threshold0 lint bug]

[Kevin: have a look at WwLib.mkWwBodies.  Isn't it a thing of beauty?
	Could you think about whether the CPR stuff could be cleaned
	up a bit?  The strictness stuff is much shorter.]


This commit tidies up WwLib.mkWwBodies, fixing a couple of bugs.

* One bug showed up when CPR made a worker return an unboxed tuple,
  but the worker didn't have any other arguments.  The "add a void arg"
  hack needed to be generalised a bit.

* The other bug showed up when booting the compiler.  There's a long
  comment near splitProductType in WwLib.lhs that explains the problem.

Enlarged heap for 2.10-compiled Happy on Alphas

pre-4.03 didn't have __HASKELL98__, use something else.