Fix #1184: Assertion Failed in InsertMissingTokensDecorator.EndNode

ICSharpCode.Decompiler/CSharp/OutputVisitor/InsertMissingTokensDecorator.cs

@@ -37,35 +37,43 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 		
 		public override void StartNode(AstNode node)
 		{
-			currentList.Add(node);
-			nodes.Push(currentList);
-			currentList = new List<AstNode>();
+			// ignore whitespace: these don't need to be processed.
+			// StartNode/EndNode is only called for them to support folding of comments.
+			if (node.NodeType != NodeType.Whitespace) {
+				currentList.Add(node);
+				nodes.Push(currentList);
+				currentList = new List<AstNode>();
+			}
 			base.StartNode(node);
 		}
 		
 		public override void EndNode(AstNode node)
 		{
-			System.Diagnostics.Debug.Assert(currentList != null);
-			foreach (var removable in node.Children.Where(n => n is CSharpTokenNode)) {
-				removable.Remove();
+			// ignore whitespace: these don't need to be processed.
+			// StartNode/EndNode is only called for them to support folding of comments.
+			if (node.NodeType != NodeType.Whitespace) {
+				System.Diagnostics.Debug.Assert(currentList != null);
+				foreach (var removable in node.Children.Where(n => n is CSharpTokenNode)) {
+					removable.Remove();
+				}
+				foreach (var child in currentList) {
+					System.Diagnostics.Debug.Assert(child.Parent == null || node == child.Parent);
+					child.Remove();
+					node.AddChildWithExistingRole(child);
+				}
+				currentList = nodes.Pop();
 			}
-			foreach (var child in currentList) {
-				System.Diagnostics.Debug.Assert(child.Parent == null || node == child.Parent);
-				child.Remove();
-				node.AddChildWithExistingRole(child);
-			}
-			currentList = nodes.Pop();
 			base.EndNode(node);
 		}
 		
 		public override void WriteToken(Role role, string token)
 		{
-			CSharpTokenNode t = new CSharpTokenNode(locationProvider.Location, (TokenRole)role);
-			t.Role = role;
 			EmptyStatement node = nodes.Peek().LastOrDefault() as EmptyStatement;
-			if (node == null)
+			if (node == null) {
+				CSharpTokenNode t = new CSharpTokenNode(locationProvider.Location, (TokenRole)role);
+				t.Role = role;
 				currentList.Add(t);
-			else {
+			} else {
 				node.Location = locationProvider.Location;
 			}
 			base.WriteToken(role, token);