blah

src/LanguageServer/Protocol/Handler/References/FindUsagesLSPContext.cs

@@ -6,6 +6,7 @@
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Diagnostics;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Classification;
@@ -71,6 +72,8 @@ internal sealed class FindUsagesLSPContext : FindUsagesContext
         // Unique identifier given to each definition and reference.
         private int _id = 0;
 
+        public StringBuilder Builder = new();
+
         public FindUsagesLSPContext(
             IProgress<SumType<VSInternalReferenceItem, LSP.Location>[]> progress,
             Workspace workspace,
@@ -158,7 +161,10 @@ public override async ValueTask OnReferencesFoundAsync(IAsyncEnumerable<SourceRe
 
                     // If this is reference to the same physical location we've already reported, just
                     // filter this out.  it will clutter the UI to show the same places.
-                    if (!_referenceLocations.Add((document.FilePath, reference.SourceSpan.SourceSpan)))
+                    var tuple = (document.FilePath, reference.SourceSpan.SourceSpan);
+                    Builder.AppendLine(tuple.ToString());
+
+                    if (!_referenceLocations.Add(tuple))
                         return;
 
                     // If the definition hasn't been reported yet, add it to our list of references to report.