diff --git a/src/Compilers/CSharp/Portable/Binder/Binder.cs b/src/Compilers/CSharp/Portable/Binder/Binder.cs
index 6279f1f7b0ba51278c4183a4b3ef9203e63baeb6..a789e1d97324436e7c29a869044aa1e53008b6e3 100644
--- a/src/Compilers/CSharp/Portable/Binder/Binder.cs
+++ b/src/Compilers/CSharp/Portable/Binder/Binder.cs
@@ -778,7 +778,8 @@ internal Binder WithPatternVariablesIfAny(ArgumentListSyntax initializerArgument
             CSharpSyntaxNode node = null,
             ImmutableArray<CSharpSyntaxNode> nodes = default(ImmutableArray<CSharpSyntaxNode>))
         {
-            var patterns = PatternVariableFinder.FindPatternVariables(node, nodes);
+            var patterns = ArrayBuilder<DeclarationPatternSyntax>.GetInstance();
+            PatternVariableFinder.FindPatternVariables(patterns, node, nodes);
             foreach (var pattern in patterns)
             {
                 builder.Add(SourceLocalSymbol.MakeLocal(ContainingMemberOrLambda, this, RefKind.None, pattern.Type, pattern.Identifier, LocalDeclarationKind.PatternVariable));
diff --git a/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs b/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs
index ecaae1e9dc55574ddcbba05ee029b1b2bf2c9d39..d3fbbb189f8608491b832020545f65bb15caef68 100644
--- a/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs
+++ b/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs
@@ -796,9 +796,9 @@ private TypeSymbol BindVariableType(CSharpSyntaxNode declarationNode, Diagnostic
             // Step out of the PatternVariableBinder for locals declared in variable declaration statement
             if (this is PatternVariableBinder)
             {
-                CSharpSyntaxNode parent;
-                if ((parent = declarator.Parent)?.Kind() == SyntaxKind.VariableDeclaration &&
-                     parent.Parent?.Kind() == SyntaxKind.LocalDeclarationStatement)
+                CSharpSyntaxNode parent = declarator.Parent;
+                if (parent?.Kind() == SyntaxKind.VariableDeclaration &&
+                    parent.Parent?.Kind() == SyntaxKind.LocalDeclarationStatement)
                 {
                     nameConflictChecker = this.Next;
                 }
diff --git a/src/Compilers/CSharp/Portable/Binder/PatternVariableFinder.cs b/src/Compilers/CSharp/Portable/Binder/PatternVariableFinder.cs
index 9f163f7df0a94e00206a70851deb49e9e8f38cec..62ec014663587d2b0d47c7f824837cfdff5eb6ad 100644
--- a/src/Compilers/CSharp/Portable/Binder/PatternVariableFinder.cs
+++ b/src/Compilers/CSharp/Portable/Binder/PatternVariableFinder.cs
@@ -13,12 +13,14 @@ namespace Microsoft.CodeAnalysis.CSharp
     class PatternVariableFinder : CSharpSyntaxWalker
     {
         ArrayBuilder<DeclarationPatternSyntax> declarationPatterns;
-        internal static ArrayBuilder<DeclarationPatternSyntax> FindPatternVariables(
+
+        internal static void FindPatternVariables(
+            ArrayBuilder<DeclarationPatternSyntax> builder,
             CSharpSyntaxNode node = null,
             ImmutableArray<CSharpSyntaxNode> nodes = default(ImmutableArray<CSharpSyntaxNode>))
         {
             var finder = s_poolInstance.Allocate();
-            finder.declarationPatterns = ArrayBuilder<DeclarationPatternSyntax>.GetInstance();
+            finder.declarationPatterns = builder;
             finder.Visit(node);
             if (!nodes.IsDefaultOrEmpty)
             {
@@ -28,10 +30,8 @@ class PatternVariableFinder : CSharpSyntaxWalker
                 }
             }
 
-            var result = finder.declarationPatterns;
             finder.declarationPatterns = null;
             s_poolInstance.Free(finder);
-            return result;
         }
 
         public override void VisitDeclarationPattern(DeclarationPatternSyntax node)