Merge NRefactory 'b059dbcf413786069599d1686ac608150bd3f357' into SharpDevelop repository.

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Document/DocumentLine.cs

@@ -222,6 +222,14 @@ namespace ICSharpCode.AvalonEdit.Document
 				}
 			}
 		}
+		
+		IDocumentLine IDocumentLine.NextLine {
+			get { return this.NextLine; }
+		}
+		
+		IDocumentLine IDocumentLine.PreviousLine {
+			get { return this.PreviousLine; }
+		}
 		#endregion
 		
 		#region ToString

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Analysis/ControlFlow.cs

@@ -673,7 +673,7 @@ namespace ICSharpCode.NRefactory.CSharp.Analysis
 				return CreateConnectedEndNode(usingStatement, bodyEnd);
 			}
 			
-			public override ControlFlowNode VisitYieldStatement(YieldStatement yieldStatement, ControlFlowNode data)
+			public override ControlFlowNode VisitYieldReturnStatement(YieldReturnStatement yieldStatement, ControlFlowNode data)
 			{
 				return CreateConnectedEndNode(yieldStatement, data);
 			}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/AstNode.cs

@@ -52,7 +52,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -83,7 +83,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder (this, child, data);
 			}
@@ -441,7 +441,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			return copy;
 		}
 		
-		public abstract S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data);
+		public abstract S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T));
 		
 		#region Pattern Matching
 		protected static bool MatchString (string name1, string name2)
@@ -613,7 +613,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			if (IsNull)
 				return "Null";
 			StringWriter w = new StringWriter();
-			AcceptVisitor(new OutputVisitor(w, new CSharpFormattingOptions()), null);
+			AcceptVisitor(new CSharpOutputVisitor(w, new CSharpFormattingOptions()), null);
 			string text = w.ToString().TrimEnd().Replace("\t", "").Replace(w.NewLine, " ");
 			if (text.Length > 100)
 				return text.Substring(0, 97) + "...";

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/AstType.cs

@@ -37,7 +37,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -68,7 +68,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/CSharpTokenNode.cs

@@ -42,7 +42,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			{
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -87,7 +87,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		#endregion
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCSharpTokenNode (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/CompilationUnit.cs

@@ -83,7 +83,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			return o != null && GetChildrenByRole(MemberRole).DoMatch(o.GetChildrenByRole(MemberRole), match);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCompilationUnit (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/ComposedType.cs

@@ -73,7 +73,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (ArraySpecifierRole); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitComposedType (this, data);
 		}
@@ -159,7 +159,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBracket); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitArraySpecifier(this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/DepthFirstAstVisitor.cs

@@ -360,9 +360,9 @@ namespace ICSharpCode.NRefactory.CSharp
 			return VisitChildren (yieldBreakStatement, data);
 		}
 		
-		public virtual S VisitYieldStatement (YieldStatement yieldStatement, T data)
+		public virtual S VisitYieldReturnStatement (YieldReturnStatement yieldReturnStatement, T data)
 		{
-			return VisitChildren (yieldStatement, data);
+			return VisitChildren (yieldReturnStatement, data);
 		}
 		
 		public virtual S VisitAnonymousMethodExpression (AnonymousMethodExpression anonymousMethodExpression, T data)

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/ErrorNode.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			// nothing
 			return default (S);

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/AnonymousMethodExpression.cs

@@ -30,11 +30,15 @@ using System.Linq;
 namespace ICSharpCode.NRefactory.CSharp
 {
 	/// <summary>
-	/// delegate(Parameters) {Body}
+	/// [async] delegate(Parameters) {Body}
 	/// </summary>
 	public class AnonymousMethodExpression : Expression
 	{
-		// used to make a difference between delegate {} and delegate () {}
+		public readonly static Role<CSharpTokenNode> AsyncModifierRole = LambdaExpression.AsyncModifierRole;
+		
+		public bool IsAsync { get; set; }
+		
+		// used to tell the difference between delegate {} and delegate () {}
 		public bool HasParameterList {
 			get; set;
 		}
@@ -78,7 +82,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAnonymousMethodExpression (this, data);
 		}
@@ -86,7 +90,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 		{
 			AnonymousMethodExpression o = other as AnonymousMethodExpression;
-			return o != null && this.HasParameterList == o.HasParameterList && this.Parameters.DoMatch(o.Parameters, match) && this.Body.DoMatch(o.Body, match);
+			return o != null && this.IsAsync == o.IsAsync && this.HasParameterList == o.HasParameterList
+				&& this.Parameters.DoMatch(o.Parameters, match) && this.Body.DoMatch(o.Body, match);
 		}
 	}
 }

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/AnonymousTypeCreateExpression.cs

@@ -64,7 +64,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAnonymousTypeCreateExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/ArrayCreateExpression.cs

@@ -51,7 +51,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (InitializerRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitArrayCreateExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/ArrayInitializerExpression.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -82,7 +82,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitArrayInitializerExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/AsExpression.cs

@@ -55,7 +55,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (type, Roles.Type);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAsExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/AssignmentExpression.cs

@@ -74,7 +74,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole(RightRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAssignmentExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/BaseReferenceExpression.cs

@@ -47,7 +47,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitBaseReferenceExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/BinaryOperatorExpression.cs

@@ -67,7 +67,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole(RightRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitBinaryOperatorExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/CastExpression.cs

@@ -59,7 +59,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (expression, Roles.Expression);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCastExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/CheckedExpression.cs

@@ -57,7 +57,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (expression, Roles.Expression);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCheckedExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/ConditionalExpression.cs

@@ -71,7 +71,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (falseExpression, FalseRole);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitConditionalExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/DefaultValueExpression.cs

@@ -57,7 +57,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (type, Roles.Type);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitDefaultValueExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/DirectionExpression.cs

@@ -62,7 +62,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (expression, Roles.Expression);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitDirectionExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/EmptyExpression.cs

@@ -62,7 +62,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		#endregion
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitEmptyExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/Expression.cs

@@ -41,7 +41,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -72,7 +72,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/IdentifierExpression.cs

@@ -60,7 +60,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.TypeArgument); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitIdentifierExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/IndexerExpression.cs

@@ -68,7 +68,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitIndexerExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/InvocationExpression.cs

@@ -50,7 +50,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RPar); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitInvocationExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/IsExpression.cs

@@ -45,7 +45,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole(Roles.Type, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitIsExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/LambdaExpression.cs

@@ -1,6 +1,6 @@
 // 
 // LambdaExpression.cs
-//  
+//
 // Author:
 //       Mike Krüger <mkrueger@novell.com>
 // 
@@ -29,14 +29,17 @@ using System.Linq;
 namespace ICSharpCode.NRefactory.CSharp
 {
 	/// <summary>
-	/// Parameters => Body
+	/// [async] Parameters => Body
 	/// </summary>
 	public class LambdaExpression : Expression
 	{
+		public readonly static Role<CSharpTokenNode> AsyncModifierRole = new Role<CSharpTokenNode>("AsyncModifier", CSharpTokenNode.Null);
 		public readonly static Role<CSharpTokenNode> ArrowRole = new Role<CSharpTokenNode>("Arrow", CSharpTokenNode.Null);
 		public static readonly Role<AstNode> BodyRole = new Role<AstNode>("Body", AstNode.Null);
 		
-		public AstNodeCollection<ParameterDeclaration> Parameters { 
+		public bool IsAsync { get; set; }
+		
+		public AstNodeCollection<ParameterDeclaration> Parameters {
 			get { return GetChildrenByRole (Roles.Parameter); }
 		}
 		
@@ -49,7 +52,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (BodyRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitLambdaExpression (this, data);
 		}
@@ -57,7 +60,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 		{
 			LambdaExpression o = other as LambdaExpression;
-			return o != null && this.Parameters.DoMatch(o.Parameters, match) && this.Body.DoMatch(o.Body, match);
+			return o != null && this.IsAsync == o.IsAsync && this.Parameters.DoMatch(o.Parameters, match) && this.Body.DoMatch(o.Body, match);
 		}
 	}
 }

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/MemberReferenceExpression.cs

@@ -87,7 +87,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}	
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitMemberReferenceExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/NamedArgumentExpression.cs

@@ -22,6 +22,7 @@ namespace ICSharpCode.NRefactory.CSharp
 {
 	/// <summary>
 	/// Represents a named argument passed to a method or attribute.
+	/// name: expression
 	/// </summary>
 	public class NamedArgumentExpression : Expression
 	{
@@ -53,8 +54,8 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 		}
 		
-		public CSharpTokenNode AssignToken {
-			get { return GetChildByRole (Roles.Assign); }
+		public CSharpTokenNode ColonToken {
+			get { return GetChildByRole (Roles.Colon); }
 		}
 		
 		public Expression Expression {
@@ -62,7 +63,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Expression, value); }
 		}
 		
-		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitNamedArgumentExpression(this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/NamedExpression.cs

@@ -72,7 +72,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Expression, value); }
 		}
 		
-		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitNamedExpression(this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/NullReferenceExpression.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			this.location = location;
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitNullReferenceExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/ObjectCreateExpression.cs

@@ -79,7 +79,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitObjectCreateExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/ParenthesizedExpression.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			Expression = expr;
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitParenthesizedExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/PointerReferenceExpression.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.TypeArgument); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitPointerReferenceExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/PrimitiveExpression.cs

@@ -83,7 +83,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		#endregion
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitPrimitiveExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/QueryExpression.cs

@@ -36,7 +36,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -52,7 +52,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole(ClauseRole); }
 		}
 		
-		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryExpression (this, data);
 		}
@@ -112,7 +112,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Identifier); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryContinuationClause (this, data);
 		}
@@ -152,7 +152,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Expression, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryFromClause (this, data);
 		}
@@ -193,7 +193,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole(Roles.Expression, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryLetClause (this, data);
 		}
@@ -217,7 +217,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Condition, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryWhereClause (this, data);
 		}
@@ -316,7 +316,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole(IntoIdentifierRole); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryJoinClause (this, data);
 		}
@@ -344,7 +344,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (OrderingRole); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryOrderClause (this, data);
 		}
@@ -376,7 +376,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Keyword); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryOrdering (this, data);
 		}
@@ -406,7 +406,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Expression, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQuerySelectClause (this, data);
 		}
@@ -443,7 +443,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (KeyRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitQueryGroupClause (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/SizeOfExpression.cs

@@ -57,7 +57,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (type, Roles.Type);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitSizeOfExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/StackAllocExpression.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBracket); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitStackAllocExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/ThisReferenceExpression.cs

@@ -47,7 +47,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 		}
 
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitThisReferenceExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/TypeOfExpression.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (type, Roles.Type);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitTypeOfExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/TypeReferenceExpression.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole(Roles.Type, value); }
 		}
 		
-		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitTypeReferenceExpression(this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/UnaryOperatorExpression.cs

@@ -59,7 +59,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Expression, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUnaryOperatorExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/UncheckedExpression.cs

@@ -57,7 +57,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (expression, Roles.Expression);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUncheckedExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/UndocumentedExpression.cs

@@ -62,7 +62,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RPar); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUndocumentedExpression (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/Attribute.cs

@@ -54,7 +54,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set;
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAttribute (this, data);
 		}
@@ -70,7 +70,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			if (IsNull)
 				return "Null";
 			var w = new System.IO.StringWriter ();
-			AcceptVisitor (new OutputVisitor (w, new CSharpFormattingOptions ()), null);
+			AcceptVisitor (new CSharpOutputVisitor (w, new CSharpFormattingOptions ()), null);
 			return w.ToString ();
 		}
 	}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/AttributeSection.cs

@@ -54,7 +54,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}
@@ -85,8 +85,21 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		
 		public string AttributeTarget {
-			get;
-			set;
+			get {
+				return GetChildByRole (Roles.Identifier).Name;
+			}
+			set {
+				SetChildByRole (Roles.Identifier, CSharp.Identifier.Create (value, TextLocation.Empty));
+			}
+		}
+		
+		public Identifier AttributeTargetToken {
+			get {
+				return GetChildByRole (Roles.Identifier);
+			}
+			set {
+				SetChildByRole (Roles.Identifier, value);
+			}
 		}
 		
 		public AstNodeCollection<Attribute> Attributes {
@@ -97,7 +110,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBracket); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAttributeSection (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/Comment.cs

@@ -91,7 +91,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		#endregion
 
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitComment (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/Constraint.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (BaseTypeRole); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitConstraint (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/DelegateDeclaration.cs

@@ -83,7 +83,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.Constraint); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitDelegateDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/ExternAliasDeclaration.cs

@@ -69,7 +69,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitExternAliasDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/NamespaceDeclaration.cs

@@ -109,7 +109,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (child, MemberRole);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitNamespaceDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/TypeDeclaration.cs

@@ -100,7 +100,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitTypeDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/TypeParameterDeclaration.cs

@@ -63,7 +63,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 		}
 		
-		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitTypeParameterDeclaration(this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/UsingAliasDeclaration.cs

@@ -82,7 +82,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (import, ImportRole);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUsingAliasDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/UsingDeclaration.cs

@@ -74,7 +74,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (import, ImportRole);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUsingDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/IAstVisitor.cs

@@ -110,7 +110,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		S VisitVariableDeclarationStatement(VariableDeclarationStatement variableDeclarationStatement, T data);
 		S VisitWhileStatement(WhileStatement whileStatement, T data);
 		S VisitYieldBreakStatement(YieldBreakStatement yieldBreakStatement, T data);
-		S VisitYieldStatement(YieldStatement yieldStatement, T data);
+		S VisitYieldReturnStatement(YieldReturnStatement yieldReturnStatement, T data);
 		
 		S VisitAccessor(Accessor accessor, T data);
 		S VisitConstructorDeclaration(ConstructorDeclaration constructorDeclaration, T data);

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Identifier.cs

@@ -39,7 +39,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -113,24 +113,25 @@ namespace ICSharpCode.NRefactory.CSharp
 
 		public static Identifier Create (string name, TextLocation location)
 		{
-			if (name == null)
-				throw new ArgumentNullException("name");
-			if (name.Length > 0 && name[0] == '@')
+			if (string.IsNullOrEmpty(name))
+				return Identifier.Null;
+			if (name[0] == '@')
 				return new VerbatimIdentifier(name.Substring (1), location);
-			return new Identifier (name, location);
+			else
+				return new Identifier (name, location);
 		}
 		
 		public static Identifier Create (string name, TextLocation location, bool isVerbatim)
 		{
-			if (name == null)
-				throw new ArgumentNullException("name");
+			if (string.IsNullOrEmpty(name))
+				return Identifier.Null;
 			
 			if (isVerbatim)
 				return new VerbatimIdentifier(name, location);
 			return new Identifier (name, location);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitIdentifier (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/MemberType.cs

@@ -87,7 +87,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitMemberType (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Modifiers.cs

@@ -30,7 +30,6 @@ using System;
 
 namespace ICSharpCode.NRefactory.CSharp
 {
-	// For compatibility with old nrefactory - same flags.
 	[Flags]
 	public enum Modifiers
 	{
@@ -54,17 +53,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		Extern    = 0x2000,
 		Volatile  = 0x4000,
 		Unsafe    = 0x8000,
+		Async     = 0x10000,
 		
-		//Overloads  = 0x10000,
-		//WithEvents = 0x20000,
-		//Default    = 0x40000,
-		//Fixed      = 0x80000,
-		
-		//ProtectedOrInternal  = Internal | Protected,
-		//ProtectedAndInternal = 0x100000, (not supported in C#)
-		//SpecialName          = 0x200000,
-		//Final                = 0x400000,
-		//Literal              = 0x800000,
 		VisibilityMask = Private | Internal | Protected | Public,
 		
 		/// <summary>

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/ObservableAstVisitor.cs

@@ -1,4 +1,4 @@
-// 
+// 
 // ObservableAstVisitor.cs
 //  
 // Author:
@@ -671,11 +671,11 @@ namespace ICSharpCode.NRefactory.CSharp
 			return VisitChildren (yieldBreakStatement, data);
 		}
 		
-		public event Action<YieldStatement, T> YieldStatementVisited;
+		public event Action<YieldReturnStatement, T> YieldReturnStatementVisited;
 
-		S IAstVisitor<T, S>.VisitYieldStatement (YieldStatement yieldStatement, T data)
+		S IAstVisitor<T, S>.VisitYieldReturnStatement (YieldReturnStatement yieldStatement, T data)
 		{
-			var handler = YieldStatementVisited;
+			var handler = YieldReturnStatementVisited;
 			if (handler != null)
 				handler (yieldStatement, data);
 			return VisitChildren (yieldStatement, data);

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/PrimitiveType.cs

@@ -68,7 +68,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		#endregion
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitPrimitiveType (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/SimpleType.cs

@@ -81,7 +81,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.TypeArgument); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitSimpleType (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/BlockStatement.cs

@@ -45,7 +45,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -76,7 +76,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}
@@ -105,7 +105,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitBlockStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/BreakStatement.cs

@@ -35,7 +35,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitBreakStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/CheckedStatement.cs

@@ -49,7 +49,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (body, Roles.Body);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCheckedStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/ContinueStatement.cs

@@ -35,7 +35,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitContinueStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/DoWhileStatement.cs

@@ -64,7 +64,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitDoWhileStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/EmptyStatement.cs

@@ -44,7 +44,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		
 		public override TextLocation EndLocation {
 			get {
-				return new TextLocation (Location.Line, Location.Column);
+				return new TextLocation (Location.Line, Location.Column + 1);
 			}
 		}
 		
@@ -55,7 +55,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		#endregion
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitEmptyStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/ExpressionStatement.cs

@@ -40,7 +40,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitExpressionStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/FixedStatement.cs

@@ -59,7 +59,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.EmbeddedStatement, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitFixedStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/ForStatement.cs

@@ -71,7 +71,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.EmbeddedStatement, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitForStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/ForeachStatement.cs

@@ -80,7 +80,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.EmbeddedStatement, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitForeachStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/GotoStatement.cs

@@ -60,7 +60,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitGotoStatement (this, data);
 		}
@@ -99,7 +99,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitGotoCaseStatement (this, data);
 		}
@@ -130,7 +130,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitGotoDefaultStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/IfElseStatement.cs

@@ -69,7 +69,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (FalseRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitIfElseStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/LabelStatement.cs

@@ -44,7 +44,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Colon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitLabelStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/LockStatement.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.EmbeddedStatement, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitLockStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/ReturnStatement.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (returnExpression, Roles.Expression);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitReturnStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/Statement.cs

@@ -25,7 +25,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -56,7 +56,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/SwitchStatement.cs

@@ -65,7 +65,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitSwitchStatement (this, data);
 		}
@@ -98,7 +98,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}
@@ -131,7 +131,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.EmbeddedStatement); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitSwitchSection (this, data);
 		}
@@ -151,6 +151,9 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 		}
 		
+		/// <summary>
+		/// Gets or sets the expression. The expression can be null - if the expression is null, it's the default switch section.
+		/// </summary>
 		public Expression Expression {
 			get { return GetChildByRole (Roles.Expression); }
 			set { SetChildByRole (Roles.Expression, value); }
@@ -165,7 +168,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			this.Expression = expression;
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCaseLabel (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/ThrowStatement.cs

@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (expression, Roles.Expression);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitThrowStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/TryCatchStatement.cs

@@ -62,7 +62,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (FinallyBlockRole, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitTryCatchStatement (this, data);
 		}
@@ -98,7 +98,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				get { return NodeType.Pattern; }
 			}
 			
-			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return visitor.VisitPatternPlaceholder(this, child, data);
 			}
@@ -162,7 +162,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Body, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCatchClause (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/UncheckedStatement.cs

@@ -49,7 +49,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			AddChild (body, Roles.Body);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUncheckedStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/UnsafeStatement.cs

@@ -40,7 +40,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Body, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUnsafeStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/UsingStatement.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.EmbeddedStatement, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitUsingStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/VariableDeclarationStatement.cs

@@ -66,7 +66,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			return Variables.FirstOrDefault (vi => vi.Name == name);
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitVariableDeclarationStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/WhileStatement.cs

@@ -55,7 +55,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.EmbeddedStatement, value); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitWhileStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/YieldBreakStatement.cs

@@ -46,7 +46,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitYieldBreakStatement (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/YieldReturnStatement.cs

@@ -29,7 +29,7 @@ namespace ICSharpCode.NRefactory.CSharp
 	/// <summary>
 	/// yield return Expression;
 	/// </summary>
-	public class YieldStatement : Statement
+	public class YieldReturnStatement : Statement
 	{
 		public static readonly Role<CSharpTokenNode> YieldKeywordRole = new Role<CSharpTokenNode>("YieldKeyword", CSharpTokenNode.Null);
 		public static readonly Role<CSharpTokenNode> ReturnKeywordRole = new Role<CSharpTokenNode>("ReturnKeyword", CSharpTokenNode.Null);
@@ -51,14 +51,14 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.Semicolon); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
-			return visitor.VisitYieldStatement (this, data);
+			return visitor.VisitYieldReturnStatement (this, data);
 		}
 		
 		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 		{
-			YieldStatement o = other as YieldStatement;
+			YieldReturnStatement o = other as YieldReturnStatement;
 			return o != null && this.Expression.DoMatch(o.Expression, match);
 		}
 	}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/Accessor.cs

@@ -42,7 +42,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -57,7 +57,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			set { SetChildByRole (Roles.Body, value); }
 		}
 		
-		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitAccessor (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/ConstructorDeclaration.cs

@@ -71,7 +71,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return NodeType.Member; }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitConstructorDeclaration (this, data);
 		}
@@ -106,7 +106,7 @@ namespace ICSharpCode.NRefactory.CSharp
 				}
 			}
 			
-			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 			{
 				return default (S);
 			}
@@ -140,7 +140,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RPar); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitConstructorInitializer (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/DestructorDeclaration.cs

@@ -62,7 +62,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return NodeType.Member; }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitDestructorDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/EnumMemberDeclaration.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return NodeType.Member; }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitEnumMemberDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/EventDeclaration.cs

@@ -43,7 +43,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.Variable); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitEventDeclaration (this, data);
 		}
@@ -79,7 +79,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitCustomEventDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/FieldDeclaration.cs

@@ -44,7 +44,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (Roles.Variable); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitFieldDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/FixedFieldDeclaration.cs

@@ -48,7 +48,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildrenByRole (VariableRole); }
 		}
 
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitFixedFieldDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/FixedVariableInitializer.cs

@@ -80,7 +80,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBracket); }
 		}
 
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitFixedVariableInitializer (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/IndexerDeclaration.cs

@@ -64,7 +64,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitIndexerDeclaration (this, data);
 		}

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/MethodDeclaration.cs

@@ -63,7 +63,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 		}
 		
-		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
+		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data = default(T))
 		{
 			return visitor.VisitMethodDeclaration (this, data);
 		}