fixup attributes

ICSharpCode.Decompiler/CSharp/Syntax/AstNode.cs

@@ -37,7 +37,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public abstract partial class AstNode : AbstractAnnotatable, IFreezable, INode, ICloneable
 	{
 		// the Root role must be available when creating the null nodes, so we can't put it in the Roles class

ICSharpCode.Decompiler/CSharp/Syntax/AstType.cs

@@ -28,7 +28,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// A type reference in the C# AST.
 	/// </summary>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public abstract partial class AstType : AstNode
 	{
 		#region PatternPlaceholder

ICSharpCode.Decompiler/CSharp/Syntax/CSharpModifierToken.cs

@@ -31,7 +31,7 @@ using ICSharpCode.Decompiler.CSharp.OutputVisitor;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class CSharpModifierToken : CSharpTokenNode
 	{
 		Modifiers modifier;

ICSharpCode.Decompiler/CSharp/Syntax/CSharpTokenNode.cs

@@ -34,7 +34,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <remarks>
 	/// In all non null c# token nodes the Role of a CSharpToken must be a TokenRole.
 	/// </remarks>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class CSharpTokenNode : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/ComposedType.cs

@@ -34,7 +34,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ComposedType : AstType
 	{
 		public static readonly Role<AttributeSection> AttributeRole = EntityDeclaration.AttributeRole;
@@ -231,7 +231,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// [,,,]
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ArraySpecifier : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/DocumentationReference.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Represents a 'cref' reference in XML documentation.
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class DocumentationReference : AstNode
 	{
 		public static readonly Role<AstType> DeclaringTypeRole = new Role<AstType>("DeclaringType", AstType.Null);

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/AnonymousMethodExpression.cs

@@ -32,7 +32,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// [async] delegate(Parameters) {Body}
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class AnonymousMethodExpression : Expression
 	{
 		public readonly static TokenRole DelegateKeywordRole = new TokenRole("delegate");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/AnonymousTypeCreateExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// new { [ExpressionList] }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class AnonymousTypeCreateExpression : Expression
 	{
 		public readonly static TokenRole NewKeywordRole = new TokenRole("new");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ArrayCreateExpression.cs

@@ -22,7 +22,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// new Type[Dimensions]
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ArrayCreateExpression : Expression
 	{
 		public readonly static TokenRole NewKeywordRole = new TokenRole("new");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ArrayInitializerExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// { Elements }
 	/// </summary>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class ArrayInitializerExpression : Expression
 	{
 		/// <summary>

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/AsExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Expression as TypeReference
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class AsExpression : Expression
 	{
 		public readonly static TokenRole AsKeywordRole = new TokenRole("as");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/AssignmentExpression.cs

@@ -33,7 +33,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Left Operator= Right
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class AssignmentExpression : Expression
 	{
 		// reuse roles from BinaryOperatorExpression

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/BaseReferenceExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// base
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class BaseReferenceExpression : Expression
 	{
 		public TextLocation Location {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/BinaryOperatorExpression.cs

@@ -32,7 +32,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Left Operator Right
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class BinaryOperatorExpression : Expression
 	{
 		public readonly static TokenRole BitwiseAndRole = new TokenRole("&");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/CastExpression.cs

@@ -28,7 +28,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// (CastTo)Expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class CastExpression : Expression
 	{
 		public CSharpTokenNode LParToken {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/CheckedExpression.cs

@@ -29,7 +29,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// checked(Expression)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class CheckedExpression : Expression
 	{
 		public readonly static TokenRole CheckedKeywordRole = new TokenRole("checked");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ConditionalExpression.cs

@@ -28,7 +28,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Condition ? TrueExpression : FalseExpression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ConditionalExpression : Expression
 	{
 		public readonly static Role<Expression> ConditionRole = Roles.Condition;

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/DeclarationExpression.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// TypeName VariableDesignation
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class DeclarationExpression : Expression
 	{
 		public AstType Type {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/DefaultValueExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// default(Type)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class DefaultValueExpression : Expression
 	{
 		public readonly static TokenRole DefaultKeywordRole = new TokenRole("default");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/DirectionExpression.cs

@@ -38,7 +38,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// ref Expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class DirectionExpression : Expression
 	{
 		public readonly static TokenRole RefKeywordRole = new TokenRole("ref");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ErrorExpression.cs

@@ -25,7 +25,7 @@
 // THE SOFTWARE.
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ErrorExpression : Expression
 	{
 		public TextLocation Location { get; set; }

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/Expression.cs

@@ -27,7 +27,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// This class is useful even though it doesn't provide any additional functionality:
 	/// It can be used to communicate more information in APIs, e.g. "this subnode will always be an expression"
 	/// </remarks>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public abstract partial class Expression : AstNode
 	{
 		#region PatternPlaceholder

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/IdentifierExpression.cs

@@ -26,7 +26,7 @@
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class IdentifierExpression : Expression
 	{
 		public IdentifierExpression()

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/IndexerExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Target[Arguments]
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class IndexerExpression : Expression
 	{
 		public Expression Target {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/InterpolatedStringExpression.cs

@@ -4,7 +4,7 @@ using ICSharpCode.Decompiler.CSharp.Syntax.PatternMatching;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class InterpolatedStringExpression : Expression
 	{
 		public static readonly TokenRole OpenQuote = new TokenRole("$\"");
@@ -46,7 +46,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public abstract partial class InterpolatedStringContent : AstNode
 	{
 		public new static readonly Role<InterpolatedStringContent> Role = new Role<InterpolatedStringContent>("InterpolatedStringContent", Syntax.InterpolatedStringContent.Null);
@@ -57,7 +57,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// { Expression , Alignment : Suffix }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class Interpolation : InterpolatedStringContent
 	{
 		public static readonly TokenRole LBrace = new TokenRole("{");
@@ -114,7 +114,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class InterpolatedStringText : InterpolatedStringContent
 	{
 		public string Text { get; set; }

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/InvocationExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Target(Arguments)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class InvocationExpression : Expression
 	{
 		public Expression Target {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/IsExpression.cs

@@ -28,7 +28,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Expression is Type
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class IsExpression : Expression
 	{
 		public readonly static TokenRole IsKeywordRole = new TokenRole("is");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/LambdaExpression.cs

@@ -29,7 +29,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// [async] Parameters => Body
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class LambdaExpression : Expression
 	{
 		public static readonly Role<AttributeSection> AttributeRole = new Role<AttributeSection>("Attribute", null);

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/MemberReferenceExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Target.MemberName
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class MemberReferenceExpression : Expression
 	{
 		public Expression Target {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/NamedArgumentExpression.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// Represents a named argument passed to a method or attribute.
 	/// name: expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class NamedArgumentExpression : Expression
 	{
 		public NamedArgumentExpression()

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/NamedExpression.cs

@@ -32,7 +32,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// This isn't the same as 'assign' even though it has the same syntax.
 	/// This expression is used in object initializers and for named attribute arguments [Attr(FieldName = value)].
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class NamedExpression : Expression
 	{
 		public NamedExpression()

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/NullReferenceExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// null
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class NullReferenceExpression : Expression
 	{
 		TextLocation location;

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ObjectCreateExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// new Type(Arguments) { Initializer }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ObjectCreateExpression : Expression
 	{
 		public readonly static TokenRole NewKeywordRole = new TokenRole("new");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/OutVarDeclarationExpression.cs

@@ -21,7 +21,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// out type expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class OutVarDeclarationExpression : Expression
 	{
 		public readonly static TokenRole OutKeywordRole = DirectionExpression.OutKeywordRole;

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ParenthesizedExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// ( Expression )
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ParenthesizedExpression : Expression
 	{
 		public CSharpTokenNode LParToken {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/PointerReferenceExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Target->MemberName
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class PointerReferenceExpression : Expression
 	{
 		public readonly static TokenRole ArrowRole = new TokenRole("->");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/PrimitiveExpression.cs

@@ -46,7 +46,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Represents a literal value.
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class PrimitiveExpression : Expression
 	{
 		public static readonly object AnyValue = new object();

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/QueryExpression.cs

@@ -18,7 +18,7 @@
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class QueryExpression : Expression
 	{
 		public static readonly Role<QueryClause> ClauseRole = new Role<QueryClause>("Clause", null);
@@ -74,7 +74,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// 	new QuerySelectClause(e)
 	/// }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryContinuationClause : QueryClause
 	{
 		public static readonly Role<QueryExpression> PrecedingQueryRole = new Role<QueryExpression>("PrecedingQuery", QueryExpression.Null);
@@ -124,7 +124,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryFromClause : QueryClause
 	{
 		public static readonly TokenRole FromKeywordRole = new TokenRole("from");
@@ -184,7 +184,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryLetClause : QueryClause
 	{
 		public readonly static TokenRole LetKeywordRole = new TokenRole("let");
@@ -238,7 +238,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	}
 
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryWhereClause : QueryClause
 	{
 		public readonly static TokenRole WhereKeywordRole = new TokenRole("where");
@@ -277,7 +277,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Represents a join or group join clause.
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryJoinClause : QueryClause
 	{
 		public static readonly TokenRole JoinKeywordRole = new TokenRole("join");
@@ -388,7 +388,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryOrderClause : QueryClause
 	{
 		public static readonly TokenRole OrderbyKeywordRole = new TokenRole("orderby");
@@ -424,7 +424,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryOrdering : AstNode
 	{
 		public readonly static TokenRole AscendingKeywordRole = new TokenRole("ascending");
@@ -477,7 +477,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		Descending
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QuerySelectClause : QueryClause
 	{
 		public readonly static TokenRole SelectKeywordRole = new TokenRole("select");
@@ -513,7 +513,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class QueryGroupClause : QueryClause
 	{
 		public static readonly TokenRole GroupKeywordRole = new TokenRole("group");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/RecursivePatternExpression.cs

@@ -20,7 +20,7 @@ using ICSharpCode.Decompiler.CSharp.Syntax.PatternMatching;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class RecursivePatternExpression : Expression
 	{
 		public static readonly Role<Expression> SubPatternRole = new Role<Expression>("SubPattern", Syntax.Expression.Null);

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/SizeOfExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// sizeof(Type)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class SizeOfExpression : Expression
 	{
 		public readonly static TokenRole SizeofKeywordRole = new TokenRole("sizeof");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/StackAllocExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// stackalloc Type[Count]
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class StackAllocExpression : Expression
 	{
 		public readonly static TokenRole StackallocKeywordRole = new TokenRole("stackalloc");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/SwitchExpression.cs

@@ -22,7 +22,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Expression switch { SwitchSections }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class SwitchExpression : Expression
 	{
 		public static readonly TokenRole SwitchKeywordRole = new TokenRole("switch");
@@ -74,7 +74,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Pattern => Expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class SwitchExpressionSection : AstNode
 	{
 		public static readonly Role<Expression> PatternRole = new Role<Expression>("Pattern", Expression.Null);

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ThisReferenceExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// this
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ThisReferenceExpression : Expression
 	{
 		public TextLocation Location {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/ThrowExpression.cs

@@ -21,7 +21,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// throw Expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ThrowExpression : Expression
 	{
 		public static readonly TokenRole ThrowKeywordRole = ThrowStatement.ThrowKeywordRole;

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/TupleExpression.cs

@@ -20,7 +20,7 @@ using ICSharpCode.Decompiler.CSharp.Syntax.PatternMatching;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TupleExpression : Expression
 	{
 		public AstNodeCollection<Expression> Elements {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/TypeOfExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// typeof(Type)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TypeOfExpression : Expression
 	{
 		public readonly static TokenRole TypeofKeywordRole = new TokenRole("typeof");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/TypeReferenceExpression.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// Represents an AstType as an expression.
 	/// This is used when calling a method on a primitive type: "int.Parse()"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TypeReferenceExpression : Expression
 	{
 		public AstType Type {

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/UnaryOperatorExpression.cs

@@ -32,7 +32,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Operator Expression
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UnaryOperatorExpression : Expression
 	{
 		public readonly static TokenRole NotRole = new TokenRole("!");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/UncheckedExpression.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// unchecked(Expression)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UncheckedExpression : Expression
 	{
 		public readonly static TokenRole UncheckedKeywordRole = new TokenRole("unchecked");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/UndocumentedExpression.cs

@@ -39,7 +39,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Represents undocumented expressions.
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UndocumentedExpression : Expression
 	{
 		public readonly static TokenRole ArglistKeywordRole = new TokenRole("__arglist");

ICSharpCode.Decompiler/CSharp/Syntax/Expressions/WithInitializerExpression.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Expression with Initializer
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class WithInitializerExpression : Expression
 	{
 		public readonly static TokenRole WithKeywordRole = new TokenRole("with");

ICSharpCode.Decompiler/CSharp/Syntax/FunctionPointerAstType.cs

@@ -31,7 +31,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class FunctionPointerAstType : AstType
 	{
 		public static readonly TokenRole PointerRole = new TokenRole("*");

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/Attribute.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Attribute(Arguments)
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class Attribute : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/AttributeSection.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// [AttributeTarget: Attributes]
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class AttributeSection : AstNode
 	{
 		#region PatternPlaceholder

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/Comment.cs

@@ -51,7 +51,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		MultiLineDocumentation
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class Comment : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/Constraint.cs

@@ -33,7 +33,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <remarks>
 	/// new(), struct and class constraints are represented using a PrimitiveType "new", "struct" or "class"
 	/// </remarks>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class Constraint : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/DelegateDeclaration.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// delegate ReturnType Name&lt;TypeParameters&gt;(Parameters) where Constraints;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class DelegateDeclaration : EntityDeclaration
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/ExternAliasDeclaration.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// extern alias IDENTIFIER;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ExternAliasDeclaration : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/NamespaceDeclaration.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// namespace Name { Members }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class NamespaceDeclaration : AstNode
 	{
 		public static readonly Role<AstNode> MemberRole = SyntaxTree.MemberRole;

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/PreProcessorDirective.cs

@@ -46,7 +46,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		Line = 12
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class LinePreprocessorDirective : PreProcessorDirective
 	{
 		public int LineNumber {
@@ -68,7 +68,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class PragmaWarningPreprocessorDirective : PreProcessorDirective
 	{
 		public static readonly Role<PrimitiveExpression> WarningRole = new Role<PrimitiveExpression>("Warning", null);
@@ -127,7 +127,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class PreProcessorDirective : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/TypeDeclaration.cs

@@ -47,7 +47,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// class Name&lt;TypeParameters&gt; : BaseTypes where Constraints;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TypeDeclaration : EntityDeclaration
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/TypeParameterDeclaration.cs

@@ -27,7 +27,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// Note: mirroring the C# syntax, constraints are not part of the type parameter declaration, but belong
 	/// to the parent type or method.
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TypeParameterDeclaration : AstNode
 	{
 		public static readonly Role<AttributeSection> AttributeRole = EntityDeclaration.AttributeRole;

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/UsingAliasDeclaration.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// using Alias = Import;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UsingAliasDeclaration : AstNode
 	{
 		public static readonly TokenRole UsingKeywordRole = new TokenRole("using");

ICSharpCode.Decompiler/CSharp/Syntax/GeneralScope/UsingDeclaration.cs

@@ -32,7 +32,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// using Import;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UsingDeclaration : AstNode
 	{
 		public static readonly TokenRole UsingKeywordRole = new TokenRole("using");

ICSharpCode.Decompiler/CSharp/Syntax/Identifier.cs

@@ -28,7 +28,7 @@ using System;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class Identifier : AstNode
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/InvocationAstType.cs

@@ -27,7 +27,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// BaseType "(" Argument { "," Argument } ")"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class InvocationAstType : AstType
 	{
 		public AstNodeCollection<Expression> Arguments {

ICSharpCode.Decompiler/CSharp/Syntax/MemberType.cs

@@ -32,7 +32,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class MemberType : AstType
 	{
 		public static readonly Role<AstType> TargetRole = new Role<AstType>("Target", AstType.Null);

ICSharpCode.Decompiler/CSharp/Syntax/PrimitiveType.cs

@@ -33,7 +33,7 @@ using ICSharpCode.Decompiler.TypeSystem.Implementation;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class PrimitiveType : AstType
 	{
 		TextLocation location;

ICSharpCode.Decompiler/CSharp/Syntax/SimpleType.cs

@@ -32,7 +32,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class SimpleType : AstType
 	{
 		public SimpleType()

ICSharpCode.Decompiler/CSharp/Syntax/Statements/BlockStatement.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// { Statements }
 	/// </summary>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class BlockStatement : Statement, IEnumerable<Statement>
 	{
 		public static readonly Role<Statement> StatementRole = new Role<Statement>("Statement", Statement.Null);

ICSharpCode.Decompiler/CSharp/Syntax/Statements/BreakStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// break;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class BreakStatement : Statement
 	{
 		public static readonly TokenRole BreakKeywordRole = new TokenRole("break");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/CheckedStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// checked BodyBlock
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class CheckedStatement : Statement
 	{
 		public static readonly TokenRole CheckedKeywordRole = new TokenRole("checked");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/ContinueStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// continue;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ContinueStatement : Statement
 	{
 		public static readonly TokenRole ContinueKeywordRole = new TokenRole("continue");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/DoWhileStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// "do EmbeddedStatement while(Condition);"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class DoWhileStatement : Statement
 	{
 		public static readonly TokenRole DoKeywordRole = new TokenRole("do");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/EmptyStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// ;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class EmptyStatement : Statement
 	{
 		public TextLocation Location {

ICSharpCode.Decompiler/CSharp/Syntax/Statements/ExpressionStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Expression;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ExpressionStatement : Statement
 	{
 		public Expression Expression {

ICSharpCode.Decompiler/CSharp/Syntax/Statements/FixedStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// fixed (Type Variables) EmbeddedStatement
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class FixedStatement : Statement
 	{
 		public static readonly TokenRole FixedKeywordRole = new TokenRole("fixed");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/ForStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// for (Initializers; Condition; Iterators) EmbeddedStatement
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ForStatement : Statement
 	{
 		public static readonly TokenRole ForKeywordRole = new TokenRole("for");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/ForeachStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// foreach (Type VariableName in InExpression) EmbeddedStatement
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ForeachStatement : Statement
 	{
 		public static readonly TokenRole AwaitRole = UnaryOperatorExpression.AwaitRole;

ICSharpCode.Decompiler/CSharp/Syntax/Statements/GotoStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// "goto Label;"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class GotoStatement : Statement
 	{
 		public static readonly TokenRole GotoKeywordRole = new TokenRole("goto");
@@ -89,7 +89,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// or "goto case LabelExpression;"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class GotoCaseStatement : Statement
 	{
 		public static readonly TokenRole GotoKeywordRole = new TokenRole("goto");
@@ -140,7 +140,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// or "goto default;"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class GotoDefaultStatement : Statement
 	{
 		public static readonly TokenRole GotoKeywordRole = new TokenRole("goto");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/IfElseStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// if (Condition) TrueStatement else FalseStatement
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class IfElseStatement : Statement
 	{
 		public readonly static TokenRole IfKeywordRole = new TokenRole("if");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/LabelStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// Label:
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class LabelStatement : Statement
 	{
 		public string Label {

ICSharpCode.Decompiler/CSharp/Syntax/Statements/LocalFunctionDeclarationStatement.cs

@@ -20,7 +20,7 @@ using ICSharpCode.Decompiler.CSharp.Syntax.PatternMatching;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class LocalFunctionDeclarationStatement : Statement
 	{
 		public static readonly Role<MethodDeclaration> MethodDeclarationRole = new Role<MethodDeclaration>("Method", null);

ICSharpCode.Decompiler/CSharp/Syntax/Statements/LockStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// lock (Expression) EmbeddedStatement;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class LockStatement : Statement
 	{
 		public static readonly TokenRole LockKeywordRole = new TokenRole("lock");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/ReturnStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// return Expression;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ReturnStatement : Statement
 	{
 		public static readonly TokenRole ReturnKeywordRole = new TokenRole("return");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/Statement.cs

@@ -27,7 +27,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// This class is useful even though it doesn't provide any additional functionality:
 	/// It can be used to communicate more information in APIs, e.g. "this subnode will always be a statement"
 	/// </remarks>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public abstract partial class Statement : AstNode
 	{
 		#region PatternPlaceholder

ICSharpCode.Decompiler/CSharp/Syntax/Statements/SwitchStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// switch (Expression) { SwitchSections }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class SwitchStatement : Statement
 	{
 		public static readonly TokenRole SwitchKeywordRole = new TokenRole("switch");
@@ -87,7 +87,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class SwitchSection : AstNode
 	{
 		#region PatternPlaceholder
@@ -174,7 +174,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class CaseLabel : AstNode
 	{
 		public static readonly TokenRole CaseKeywordRole = new TokenRole("case");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/ThrowStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// throw Expression;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ThrowStatement : Statement
 	{
 		public static readonly TokenRole ThrowKeywordRole = new TokenRole("throw");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/TryCatchStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// try TryBlock CatchClauses finally FinallyBlock
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TryCatchStatement : Statement
 	{
 		public static readonly TokenRole TryKeywordRole = new TokenRole("try");
@@ -86,7 +86,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// catch (Type VariableName) { Body }
 	/// </summary>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class CatchClause : AstNode
 	{
 		public static readonly TokenRole CatchKeywordRole = new TokenRole("catch");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/UncheckedStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// unchecked BodyBlock
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UncheckedStatement : Statement
 	{
 		public static readonly TokenRole UncheckedKeywordRole = new TokenRole("unchecked");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/UnsafeStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// unsafe { Body }
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UnsafeStatement : Statement
 	{
 		public static readonly TokenRole UnsafeKeywordRole = new TokenRole("unsafe");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/UsingStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// [ await ] using (ResourceAcquisition) EmbeddedStatement
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class UsingStatement : Statement
 	{
 		public static readonly TokenRole UsingKeywordRole = new TokenRole("using");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/VariableDeclarationStatement.cs

@@ -27,7 +27,7 @@
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class VariableDeclarationStatement : Statement
 	{
 		public static readonly Role<CSharpModifierToken> ModifierRole = EntityDeclaration.ModifierRole;

ICSharpCode.Decompiler/CSharp/Syntax/Statements/WhileStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// "while (Condition) EmbeddedStatement"
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class WhileStatement : Statement
 	{
 		public static readonly TokenRole WhileKeywordRole = new TokenRole("while");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/YieldBreakStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// yield break;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class YieldBreakStatement : Statement
 	{
 		public static readonly TokenRole YieldKeywordRole = new TokenRole("yield");

ICSharpCode.Decompiler/CSharp/Syntax/Statements/YieldReturnStatement.cs

@@ -30,7 +30,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// yield return Expression;
 	/// </summary>
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class YieldReturnStatement : Statement
 	{
 		public static readonly TokenRole YieldKeywordRole = new TokenRole("yield");

ICSharpCode.Decompiler/CSharp/Syntax/SyntaxTree.cs

@@ -30,7 +30,7 @@ using ICSharpCode.Decompiler.Util;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class SyntaxTree : AstNode
 	{
 		public static readonly Role<AstNode> MemberRole = new Role<AstNode>("Member", AstNode.Null);

ICSharpCode.Decompiler/CSharp/Syntax/TupleAstType.cs

@@ -25,7 +25,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class TupleAstType : AstType
 	{
 		public static readonly Role<TupleTypeElement> ElementRole = new Role<TupleTypeElement>("Element", TupleTypeElement.Null);
@@ -63,7 +63,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		}
 	}
 
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class TupleTypeElement : AstNode
 	{
 		public AstType Type {

ICSharpCode.Decompiler/CSharp/Syntax/TypeMembers/Accessor.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 	/// <summary>
 	/// get/set/init/add/remove
 	/// </summary>
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class Accessor : EntityDeclaration
 	{
 		public override NodeType NodeType {

ICSharpCode.Decompiler/CSharp/Syntax/TypeMembers/ConstructorDeclaration.cs

@@ -28,7 +28,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.Decompiler.CSharp.Syntax
 {
-	[DecompilerAstNode(false)]
+	[DecompilerAstNode(hasNullNode: false)]
 	public partial class ConstructorDeclaration : EntityDeclaration
 	{
 		public static readonly Role<ConstructorInitializer> InitializerRole = new Role<ConstructorInitializer>("Initializer", ConstructorInitializer.Null);
@@ -93,7 +93,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		This
 	}
 
-	[DecompilerAstNode(true)]
+	[DecompilerAstNode(hasNullNode: true)]
 	public partial class ConstructorInitializer : AstNode
 	{
 		public static readonly TokenRole BaseKeywordRole = new TokenRole("base");