Moving IgnoreElements to AsyncEnumerableEx.

Ix.NET/Source/System.Interactive.Async.Tests/AsyncTests.Single.cs

@@ -2889,7 +2889,7 @@ namespace Tests
         [Fact]
         public void IgnoreElements_Null()
         {
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.IgnoreElements(default(IAsyncEnumerable<int>)));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerableEx.IgnoreElements(default(IAsyncEnumerable<int>)));
         }
 
         [Fact]

Ix.NET/Source/System.Interactive.Async/IgnoreElements.cs → Ix.NET/Source/System.Interactive.Async/System/Linq/Operators/IgnoreElements.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace System.Linq
 {
-    public static partial class AsyncEnumerable
+    public static partial class AsyncEnumerableEx
     {
         public static IAsyncEnumerable<TSource> IgnoreElements<TSource>(this IAsyncEnumerable<TSource> source)
         {