try selectmany

src/UniTask.NetCore/Linq/AsyncEnumeratorBase.cs

@@ -46,8 +46,21 @@ namespace Cysharp.Threading.Tasks.Linq
                 return false;
             }
         }
-    }
 
+        protected bool TryGetResult(UniTask.Awaiter awaiter)
+        {
+            try
+            {
+                awaiter.GetResult();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                completionSource.TrySetException(ex);
+                return false;
+            }
+        }
+    }
 
     public abstract class AsyncEnumeratorBase<TSource, TResult> : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
     {

src/UniTask.NetCore/Linq/_FileMaker.cs

@@ -305,11 +305,6 @@ namespace ___Dummy
 
   
 
-        public static IUniTaskAsyncEnumerable<TSource> Reverse<TSource>(this IUniTaskAsyncEnumerable<TSource> source)
-        {
-            throw new NotImplementedException();
-        }
-
 
 
         public static IUniTaskAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, IUniTaskAsyncEnumerable<TResult>> selector)