2005-02-25 Martin Baulig <martin@ximian.com>

2005-02-25  Martin Baulig  <martin@ximian.com>

	The first part of Nullable Types :-)

	* generic.cs (NullableType): New public class.
	(NullCoalescingOperator): New public class.
	(TypeArguments.Resolve): Add a CS0306 check.

	* cs-parser.jay (opt_error_modifier): Removed, this was unused.
	(opt_nullable): New rule.
	(type): Added `opt_nullable' to `namespace_or_type_name',
	`builtin_types' and `pointer_type'.
	(array_type): Added `opt_nullable'.
	(opt_rank_specifier_or_nullable): New rule; this is the
	combination of `opt_rank_specifier' and `opt_nullable'.
	(opt_error): New rule; catch errors here.
	(nullable_type_or_conditional): New rule; we use this to check for
	nullable and still detect the conditional operator.
	(local_variable_type): Use `opt_rank_specifier_or_nullable'
	instead `opt_rank_specifier'.

	* expression.cs (ComposedCast.DoResolveAsTypeStep): Added support
	for nullables.

svn path=/trunk/mcs/; revision=41210