dotnet-core/release-notes/5.0/netstandard2.1/5.0-preview5_System.IO.Pipes.md

System.IO.Pipes

 namespace System.IO.Pipes {
     public sealed class AnonymousPipeClientStream : PipeStream {
+        ~AnonymousPipeClientStream();
     }
     public sealed class AnonymousPipeServerStream : PipeStream {
+        ~AnonymousPipeServerStream();
     }
     public sealed class NamedPipeClientStream : PipeStream {
+        ~NamedPipeClientStream();
     }
     public sealed class NamedPipeServerStream : PipeStream {
+        ~NamedPipeServerStream();
     }
     public abstract class PipeStream : Stream {
+        public override Task FlushAsync(CancellationToken cancellationToken);
     }
 }