private bool IsPredefinedType(TypeNode t)
{
return (t == SystemTypes.Int8) || (t == SystemTypes.UInt8) ||
(t == SystemTypes.Int16) || (t == SystemTypes.UInt16) ||
(t == SystemTypes.Int32) || (t == SystemTypes.UInt32) ||
(t == SystemTypes.Int64) || (t == SystemTypes.UInt64) ||
(t == SystemTypes.Single) || (t == SystemTypes.Double) ||
(t == SystemTypes.Boolean) || (t == SystemTypes.Decimal) ||
(t == SystemTypes.String);
}