fix

src/Dependencies/PooledObjects/ArrayBuilder.cs

@@ -510,7 +510,7 @@ public void AddMany(T item, int count)
 
         public void RemoveDuplicates()
         {
-            using var _ = PooledHashSet<T>.GetInstance(out var set);
+            var set = PooledHashSet<T>.GetInstance();
 
             var j = 0;
             for (var i = 0; i < Count; i++)
@@ -523,6 +523,7 @@ public void RemoveDuplicates()
             }
 
             Clip(j);
+            set.Free();
         }
 
         public void SortAndRemoveDuplicates(IComparer<T> comparer)
@@ -550,7 +551,7 @@ public void SortAndRemoveDuplicates(IComparer<T> comparer)
         public ImmutableArray<S> SelectDistinct<S>(Func<T, S> selector)
         {
             var result = ArrayBuilder<S>.GetInstance(Count);
-            using var _ = PooledHashSet<S>.GetInstance(out var set);
+            var set = PooledHashSet<S>.GetInstance();
 
             foreach (var item in this)
             {
@@ -561,6 +562,7 @@ public ImmutableArray<S> SelectDistinct<S>(Func<T, S> selector)
                 }
             }
 
+            set.Free();
             return result.ToImmutableAndFree();
         }
     }

src/Features/Core/Portable/EditAndContinue/EditSession.cs

@@ -961,7 +961,7 @@ void Emit()
             out ImmutableArray<(Guid ThreadId, ActiveInstructionId OldInstructionId, LinePositionSpan NewSpan)> activeStatementsInUpdatedMethods,
             out ImmutableArray<(ActiveMethodId Method, NonRemappableRegion Region)> nonRemappableRegions)
         {
-            using var _ = PooledDictionary<(int MethodToken, int MethodVersion, LinePositionSpan BaseSpan), LinePositionSpan>.GetInstance(out var changedNonRemappableSpans);
+            using var _1 = PooledDictionary<(int MethodToken, int MethodVersion, LinePositionSpan BaseSpan), LinePositionSpan>.GetInstance(out var changedNonRemappableSpans);
             var activeStatementsInUpdatedMethodsBuilder = ArrayBuilder<(Guid, ActiveInstructionId, LinePositionSpan)>.GetInstance();
             var nonRemappableRegionsBuilder = ArrayBuilder<(ActiveMethodId Method, NonRemappableRegion Region)>.GetInstance();
 
@@ -1030,7 +1030,7 @@ void AddNonRemappableRegion(LinePositionSpan oldSpan, LinePositionSpan newSpan,
             activeStatementsInUpdatedMethods = activeStatementsInUpdatedMethodsBuilder.ToImmutableAndFree();
 
             // Gather all active method instances contained in this project/module that are not up-to-date:
-            using var _ = PooledHashSet<ActiveMethodId>.GetInstance(out var unremappedActiveMethods);
+            using var _2 = PooledHashSet<ActiveMethodId>.GetInstance(out var unremappedActiveMethods);
             foreach (var (instruction, baseActiveStatement) in baseActiveStatements.InstructionMap)
             {
                 if (moduleId == instruction.MethodId.ModuleId && !baseActiveStatement.IsMethodUpToDate)