Proper check.

src/Features/Core/Portable/UseCollectionInitializer/ObjectCreationExpressionAnalyzer.cs

@@ -238,7 +238,7 @@ private bool TryInitializeVariableDeclarationCase()
                 return false;
             }
 
-            var containingDeclarator = _objectCreationExpression.Parent as TVariableDeclaratorSyntax;
+            var containingDeclarator = _objectCreationExpression.Parent.Parent as TVariableDeclaratorSyntax;
             if (containingDeclarator == null)
             {
                 return false;

src/Features/Core/Portable/UseObjectInitializer/ObjectCreationExpressionAnalyzer.cs

@@ -248,7 +248,7 @@ private bool TryInitializeVariableDeclarationCase()
                 return false;
             }
 
-            var containingDeclarator = _objectCreationExpression.Parent as TVariableDeclaratorSyntax;
+            var containingDeclarator = _objectCreationExpression.Parent.Parent as TVariableDeclaratorSyntax;
             if (containingDeclarator == null)
             {
                 return false;