Add watson information.

src/EditorFeatures/Core.Wpf/Suggestions/SuggestedActionWithNestedActions.cs

@@ -2,13 +2,15 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Diagnostics;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.CodeActions;
 using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
+using Microsoft.CodeAnalysis.ErrorReporting;
 using Microsoft.CodeAnalysis.Shared.Utilities;
 using Microsoft.VisualStudio.Language.Intellisense;
 using Microsoft.VisualStudio.Text;
@@ -51,7 +53,16 @@ public sealed override Task<IEnumerable<SuggestedActionSet>> GetActionSetsAsync(
         protected override void InnerInvoke(IProgressTracker progressTracker, CancellationToken cancellationToken)
         {
             // A code action with nested actions is itself never invokable.  So just do nothing if this ever gets asked.
-            Debug.Fail("Invoke should not be called on a SuggestedActionWithNestedActions");
+            // Report a message in debug and log a watson exception so that if this is hit we can try to narrow down how
+            // this happened.
+            Debug.Fail("InnerInvoke should not be called on a SuggestedActionWithNestedActions");
+            try
+            {
+                throw new InvalidOperationException("Invoke should not be called on a SuggestedActionWithNestedActions");
+            }
+            catch (Exception e) when (FatalError.ReportWithoutCrash(e))
+            {
+            }
         }
     }
 }