namespace System.Runtime.CompilerServices { public struct AsyncIteratorMethodBuilder { public static AsyncIteratorMethodBuilder Create(); public void MoveNext<[System.Runtime.CompilerServices.Nullable(0)] TStateMachine>(ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine; public void AwaitOnCompleted<[System.Runtime.CompilerServices.Nullable(0)] TAwaiter, [System.Runtime.CompilerServices.Nullable(0)] TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : INotifyCompletion where TStateMachine : IAsyncStateMachine; public void AwaitUnsafeOnCompleted<[System.Runtime.CompilerServices.Nullable(0)] TAwaiter, [System.Runtime.CompilerServices.Nullable(0)] TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : ICriticalNotifyCompletion where TStateMachine : IAsyncStateMachine; public void Complete(); } }