2006-09-23 Marek Safar <marek.safar@seznam.cz>

2006-09-23  Marek Safar  <marek.safar@seznam.cz>

	* cfold.cs (BinaryFold): On the guest to unify empty constant cast.

	* const.cs (Const.Define): Check for constant type.
	(Const.IsConstantTypeValid): Looks for valid constant types.

	* convert.cs (ImplicitReferenceConversion): NullCast to EmptyConstantCast.

	* ecore.cs (EmptyConstantCast): New common class for all constant based
	EmptyCast(s).

	* expression.cs (Is.DoResolve): Handle null constant especially.
	(New.DoResolve): Check for new void().
	(MemberAccess.DoResolve): Cope with all kind of nulls.

	* literal.cs (NullConstant): Uses EmptyConstantCast.
	(NullDefault): Based on EmptyConstantCast.
	(NullLiteral): Uses EmptyConstantCast.

	* statement.cs (Block.ResolveMeta): Check for constant type.

GMCS:

2006-09-23  Marek Safar  <marek.safar@seznam.cz>

	* convert.cs (ImplicitReferenceConversion): NullCast to EmptyConstantCast.

	* cs-parser.jay: Parse correctly cast of default (T).

	* generic.cs (DefaultValueExpression.DoResolve): Check for void type.
	Store original type via EmptyConstantCast.

svn path=/trunk/mcs/; revision=65833