Use source generator to generate Zip overloads

Ix.NET/Source/System.Linq.Async/System/Linq/AsyncEnumerable.AsyncOverloads.cs

@@ -11,27 +11,10 @@ namespace System.Linq
     partial class AsyncEnumerable
     {
 #if SUPPORT_FLAT_ASYNC_API
-        public static IAsyncEnumerable<TResult> Zip<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, ValueTask<TResult>> selector) => ZipAwaitCore<TFirst, TSecond, TResult>(first, second, selector);
-
 #if !NO_DEEP_CANCELLATION
-        public static IAsyncEnumerable<TResult> Zip<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, CancellationToken, ValueTask<TResult>> selector) => ZipAwaitWithCancellationCore<TFirst, TSecond, TResult>(first, second, selector);
 #endif
 #else
-        /// <summary>
-        /// Merges two async-enumerable sequences into one async-enumerable sequence by combining their elements in a pairwise fashion.
-        /// </summary>
-        /// <typeparam name="TFirst">The type of the elements in the first source sequence.</typeparam>
-        /// <typeparam name="TSecond">The type of the elements in the second source sequence.</typeparam>
-        /// <typeparam name="TResult">The type of the elements in the result sequence, returned by the selector function.</typeparam>
-        /// <param name="first">First async-enumerable source.</param>
-        /// <param name="second">Second async-enumerable source.</param>
-        /// <param name="selector">An asynchronous function to invoke and await for each consecutive pair of elements from the first and second source.</param>
-        /// <returns>An async-enumerable sequence containing the result of pairwise combining the elements of the first and second source using the specified result selector function.</returns>
-        /// <exception cref="ArgumentNullException"><paramref name="first"/> or <paramref name="second"/> or <paramref name="selector"/> is null.</exception>
-        public static IAsyncEnumerable<TResult> ZipAwait<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, ValueTask<TResult>> selector) => ZipAwaitCore<TFirst, TSecond, TResult>(first, second, selector);
-
 #if !NO_DEEP_CANCELLATION
-        public static IAsyncEnumerable<TResult> ZipAwaitWithCancellation<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, CancellationToken, ValueTask<TResult>> selector) => ZipAwaitWithCancellationCore<TFirst, TSecond, TResult>(first, second, selector);
 #endif
 #endif
     }

Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Zip.cs

@@ -67,7 +67,19 @@ namespace System.Linq
             }
         }
 
-        internal static IAsyncEnumerable<TResult> ZipAwaitCore<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, ValueTask<TResult>> selector)
+        /// <summary>
+        /// Merges two async-enumerable sequences into one async-enumerable sequence by combining their elements in a pairwise fashion.
+        /// </summary>
+        /// <typeparam name="TFirst">The type of the elements in the first source sequence.</typeparam>
+        /// <typeparam name="TSecond">The type of the elements in the second source sequence.</typeparam>
+        /// <typeparam name="TResult">The type of the elements in the result sequence, returned by the selector function.</typeparam>
+        /// <param name="first">First async-enumerable source.</param>
+        /// <param name="second">Second async-enumerable source.</param>
+        /// <param name="selector">An asynchronous function to invoke and await for each consecutive pair of elements from the first and second source.</param>
+        /// <returns>An async-enumerable sequence containing the result of pairwise combining the elements of the first and second source using the specified result selector function.</returns>
+        /// <exception cref="ArgumentNullException"><paramref name="first"/> or <paramref name="second"/> or <paramref name="selector"/> is null.</exception>
+        [GenerateAsyncOverload]
+        private static IAsyncEnumerable<TResult> ZipAwaitCore<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, ValueTask<TResult>> selector)
         {
             if (first == null)
                 throw Error.ArgumentNull(nameof(first));
@@ -91,7 +103,8 @@ namespace System.Linq
         }
 
 #if !NO_DEEP_CANCELLATION
-        internal static IAsyncEnumerable<TResult> ZipAwaitWithCancellationCore<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, CancellationToken, ValueTask<TResult>> selector)
+        [GenerateAsyncOverload]
+        private static IAsyncEnumerable<TResult> ZipAwaitWithCancellationCore<TFirst, TSecond, TResult>(this IAsyncEnumerable<TFirst> first, IAsyncEnumerable<TSecond> second, Func<TFirst, TSecond, CancellationToken, ValueTask<TResult>> selector)
         {
             if (first == null)
                 throw Error.ArgumentNull(nameof(first));