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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.

Fix RnEnv.mkPrintUnqualFn

Small changes to make the compiler boot itself

Fix renamer crash on bootstrap build

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.

First take at 'foreign label's

getAllFilesMatching: increase malleability factor by a notch;
just warn if an element along the import search path doesn't
exist, don't barf.

In an interface file, don't allow data and newtype decls to have deriving clauses (not needed.)

Renaming foreign decls

Range check MachInts we're slurping in

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

Tidied up parsing of expressions

Add NOINLINE pragma.

- add new type of inline info: IDontWantToBeINLINEd

- hopefully get the interactions between IMustNotBeINLINEd (which is
  used by the simplifier to ensure termination when simplifying
  recursive binding groups) and IDontWantToBeINLINEd.

- no need to pass NOINLINE across modules, we just make sure that any
  function marked as NOLINE doesn't get an unfolding in the interface.

Convert floating point literals from interfaces directly to Rationals,
rather than go via Doubles.

Import lists updated

Fix two small renamer bugs, and Christophs duplicated-constraint-in-interface files bug

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

back out last commit - it had some unboxed tuple stuff in it, not
ready for committing yet.

use symbols instead of names for some terminals.  eg.

	DCOLON --> '::'
	VBAR   --> '|'
	etc.

Specialisation works at last

Specialiser really nearly working!

Simons changes while away at Tic/WG2.8

Misc changes by Simon to emit and handle cross-module specialisations

Reorganisation of Id, IdInfo.  Remove StdIdInfo, PragmaInfo; add basicTypes/MkId.lhs

addAvailEnv: restrict previous change to not redo
duplicate checks.

addAvailEnv: special handling of explicit exports of class methods.

Interface file version checking support. Added a compiler version field
to the interface file header. The format is now

  _interface_ <IfaceName> <ModuleVersion> <CompilerVersion>

where the compiler version follow the value of $(ProjectVersionInt).
Any mismatch in version numbers causes the renamer to give up.

A compiler version number of 0 means turn off version checking (used
by PrelGHC.hi to avoid having to update every time we release.)

.hi-boot files are treated specially, the absence of a compiler
version number in the header is taken to mean that there was a `0'.
Need to do this since hsc's .hi-boot files have to also be useable
by versions of the compiler that don't grok version info in interface
files (e.g., ghc-2.10.)

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.)

fixes for errors in last commit.

Several small fixes to multi-param type classes

checkForModuleExportDups: no need for irrefutable pats

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

Support for assertions:
  - if `assert' is not a variable name within
    scope, it is expanded to (GHCerr.assert__ <srcLoc>),

       GHCerr.assert__ :: String -> Bool -> a -> a

    where <srcLoc> encodes module name plus line number
    of the assertion.
  - enabled with -fglasgow-exts

- 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)

Fix interaction of "hiding" on import with "module M" on export