Splitting IsEmpty into separate file.

Ix.NET/Source/System.Interactive.Async/AsyncEnumerable.cs

@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information. 
 
 using System.Collections.Generic;
-using System.Threading;
 using System.Threading.Tasks;
 
 namespace System.Linq
@@ -23,31 +22,14 @@ namespace System.Linq
             return CreateEnumerable(() => CreateEnumerator<TValue>(ct => TaskExt.False, current: null, dispose: null));
         }
 
-        public static Task<bool> IsEmpty<TSource>(this IAsyncEnumerable<TSource> source)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-
-            return source.IsEmpty(CancellationToken.None);
-        }
-
-        public static Task<bool> IsEmpty<TSource>(this IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-
-            return IsEmpty_(source, cancellationToken);
-        }
-
         public static IAsyncEnumerable<TValue> Never<TValue>()
         {
             return CreateEnumerable(() => CreateEnumerator<TValue>(tcs => tcs.Task, current: null, dispose: null));
         }
 
-
         public static IAsyncEnumerable<TValue> Return<TValue>(TValue value)
         {
-            return new[] {value}.ToAsyncEnumerable();
+            return new[] { value }.ToAsyncEnumerable();
         }
 
         public static IAsyncEnumerable<TValue> Throw<TValue>(Exception exception)
@@ -67,10 +49,5 @@ namespace System.Linq
                     dispose: null)
             );
         }
-
-        private static async Task<bool> IsEmpty_<TSource>(IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
-        {
-            return !await source.Any(cancellationToken).ConfigureAwait(false);
-        }
     }
 }

Ix.NET/Source/System.Interactive.Async/IsEmpty.cs

@@ -0,0 +1,34 @@
+// 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.Threading;
+using System.Threading.Tasks;
+
+namespace System.Linq
+{
+    public static partial class AsyncEnumerable
+    {
+        public static Task<bool> IsEmpty<TSource>(this IAsyncEnumerable<TSource> source)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            return source.IsEmpty(CancellationToken.None);
+        }
+
+        public static Task<bool> IsEmpty<TSource>(this IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            return IsEmpty_(source, cancellationToken);
+        }
+
+        private static async Task<bool> IsEmpty_<TSource>(IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
+        {
+            return !await source.Any(cancellationToken).ConfigureAwait(false);
+        }
+    }
+}