Simplify

src/Workspaces/Core/Portable/FindSymbols/FindReferences/DependentTypeFinder.KeyEqualityComparer.cs

@@ -2,10 +2,8 @@
 // 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.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.Immutable;
-using System.Runtime.CompilerServices;
 using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.FindSymbols

src/Workspaces/Core/Portable/FindSymbols/FindReferences/DependentTypeFinder.cs

@@ -247,13 +247,13 @@ internal static partial class DependentTypeFinder
 
             Debug.Assert(project.SupportsCompilation);
 
-            using var _ = GetSymbolSet(out var tempBuffer);
-
             // First see what derived metadata types we might find in this project. This is only necessary if we
             // started with a metadata type (i.e. a source type could not have a descendant type found in metadata,
             // but a metadata type could have descendant types in source and metadata).
             if (searchInMetadata)
             {
+                using var _ = GetSymbolSet(out var tempBuffer);
+
                 await AddDescendantMetadataTypesInProjectAsync(
                     currentMetadataTypes,
                     result: tempBuffer,
@@ -278,7 +278,7 @@ internal static partial class DependentTypeFinder
             }
 
             {
-                tempBuffer.Clear();
+                using var _ = GetSymbolSet(out var tempBuffer);
 
                 // Now search the project and see what source types we can find.
                 await AddDescendantSourceTypesInProjectAsync(