Make GetConfiguredAsyncEnumerator internal.

Ix.NET/Source/System.Interactive.Async/System.Interactive.Async.csproj

@@ -12,6 +12,7 @@
     <Compile Include="..\System.Linq.Async\System\Linq\AsyncIterator.cs" Link="System\Linq\AsyncIterator.cs" />
     <Compile Include="..\System.Linq.Async\System\Linq\Set.cs" Link="System\Linq\Set.cs" />
     <Compile Include="..\System.Linq.Async\System\Strings.cs" Link="System\Strings.cs" />
+    <Compile Include="..\System.Linq.Async\System\Threading\Tasks\AsyncEnumerableExt.cs" Link="System\Threading\Tasks\AsyncEnumerableExt.cs" />
   </ItemGroup>
 
   <ItemGroup>
@@ -21,5 +22,9 @@
   <ItemGroup>
     <ProjectReference Include="..\System.Linq.Async\System.Linq.Async.csproj" />
   </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="System\Threading\Tasks\" />
+  </ItemGroup>
   
 </Project>

Ix.NET/Source/System.Linq.Async/System/Threading/Tasks/AsyncEnumerableExt.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+namespace System.Threading.Tasks
+{
+    internal static class AsyncEnumerableExt
+    {
+        public static ConfiguredCancelableAsyncEnumerable<T>.Enumerator GetConfiguredAsyncEnumerator<T>(this IAsyncEnumerable<T> enumerable, CancellationToken cancellationToken, bool continueOnCapturedContext)
+        {
+            return AsyncEnumerableExtensions.ConfigureAwait(enumerable, continueOnCapturedContext).WithCancellation(cancellationToken).GetAsyncEnumerator();
+        }
+    }
+}

Ix.NET/Source/System.Linq.Async/System/Threading/Tasks/AsyncEnumerableExtensions.cs

@@ -95,14 +95,5 @@ namespace System.Threading.Tasks
         internal static ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(
             this IAsyncEnumerable<T> source, CancellationToken cancellationToken) => TaskExtensions.WithCancellation(source, cancellationToken);
 #endif
-
-        public static ConfiguredCancelableAsyncEnumerable<T>.Enumerator GetConfiguredAsyncEnumerator<T>(this IAsyncEnumerable<T> enumerable, CancellationToken cancellationToken, bool continueOnCapturedContext)
-        {
-#if REFERENCE_ASSEMBLY
-            return default;
-#else
-            return ConfigureAwait(enumerable, continueOnCapturedContext).WithCancellation(cancellationToken).GetAsyncEnumerator();
-#endif
-        }
     }
 }