<PackageReference Include="NETStandard.Library" Version="2.0.0-preview2-25401-01" />

System.Threading.CancellationTokenRegistration

namespace System.Threading { public struct CancellationTokenRegistration : IDisposable, IEquatable<CancellationTokenRegistration> { public void Dispose(); public bool Equals(CancellationTokenRegistration other); public static bool operator ==(CancellationTokenRegistration left, CancellationTokenRegistration right); public static bool operator !=(CancellationTokenRegistration left, CancellationTokenRegistration right); } }