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Assorted minor Haskell 98 changes:

  * Maximal munch rule for "--" comments
  * _ as lower-case letter, "_" is a reserved id. Prefixing unused
    variable names in patterns with '_' causes the renamer not to
    report such names as being unused.
  * allow empty decls
  * comprehensions are now list comprehensions, not monadic.
  * use Monad.fail to signal pattern matching errors within
    do expressions.
  * remove record punning.
  * empty contexts are now legal  (go wild!)
  * allow records with no fields
  * allow newtypes with a labelled field
  * default default is now (Integer, Double)
  * turn off defaulting mechanism for args & res to a _ccall_.
  * allow LHSs of the form  (a -.- b) x = ...
  * Main.main can now have type (IO a)
  * nuked Void (and its use in the compiler sources.)
  * deriving machinery for Enum now also generate 'succ' and 'pred'
    method bindings.

Small changes to make the compiler boot itself

Another big commit from Simon.  Actually, the last one
didn't all go into the main trunk; because of a CVS glitch it
ended up in the wrong branch.

So this commit includes:

* Scoped type variables
* Warnings for unused variables should work now (they didn't before)
* Simplifier improvements:
	- Much better treatment of strict arguments
	- Better treatment of bottoming Ids
	- No need for w/w split for fns that are merely strict
	- Fewer iterations needed, I hope
* Less gratuitous renaming in interface files and abs C
* OccName is a separate module, and is an abstract data type

I think the whole Prelude and Exts libraries compile correctly.
Something isn't quite right about typechecking existentials though.

Move 4.01 onto the main trunk.

Renaming foreign decls

back out foreign decl change, not supposed to see that just yet

commas inside SLIT()s have never been a good idea

importDecl: Improved warning message for (attempted) reflexive import

Turn off pruning of newtypes, the code generator may need to see constructor

Import lists updated

Prior to renaming, build up a mapping from module names to
file path of corresponding interface file.

Dictionaries are now named as follows:

  $d<class><tycon><n>

where "n" is a positive int, "tycon" is the name of the tyvar/tycon
of the first argument to the "class" that the dict represent an
instance of.

The change should improve the behaviour of the recompilation
checker, preventing the recompilation of all the dependents
of a module whenever a data type of instance is added to it.
(The common behaviour should be no recompilations, but there
are cases where the naming scheme fails to prevent a recompile.)

New debug flag: -dshow-rn-imports, dump to stderr the paths to the interface files that are slurped.

- Fixes for bootstrapping with 3.01.
  - Use 'official' extension interfaces rather than internal prelude
    modules (such as ArrBase) where possible.
  - Remove some cruft.
  - Delete some unused imports found by '-fwarn-unused-imports'.

Split -fwarn-unused-names into

	-fwarn-unused-imports	 Warn about unused explicit imports. (in -W)
	-fwarn-unused-binds	 Warn about unused bindings	     (in -W)
	-fwarn-unused-matches    Warn about unused names in pattern matches
				 (not as useful, relegated to -Wall)

The Great Multi-Parameter Type Classes Merge.

Notes from Simon (abridged):

* Multi-parameter type classes are fully implemented.
* Error messages from the type checker should be noticeably improved
* Warnings for unused bindings (-fwarn-unused-names)
* many other minor bug fixes.

Internally there are the following changes

* Removal of Haskell 1.2 compatibility.
* Dramatic clean-up of the PprStyle stuff.
* The type Type has been substantially changed.
* The dictionary for each class is represented by a new
  data type for that purpose, rather than by a tuple.

Support new version of Happy.  The interface file parsers now require the
version of Happy in the tree to compile.

hi-boot files made independent of ways; print out reason for why recompilation checker fails

ppr update; loadDecl discards pragma info

Instance pruning; improved ppr

ghc-2-03-p1 merged onto main trunk

2.04 changes

More small changes towards 2.02

Major update to more-or-less 2.02

More polishing by Simon; to get nofib to run!

Cross module worker-wrappers

Pragmas in interface files added

SLPJ new renamer and lots more

partain 1.3 changes through 960719

partain changes to 960714

partain 1.3 changes through 960629

SLPJ 1.3 changes through 96/06/25

SLPJ changes to 960611

SLPJ changes through 960604

Sansom changes through 960520

Sansom changes through 960515

SLPJ changes through 960515

SLPJ 1.3 changes through 960505

Sansom 1.3 changes through 960503