using System.Runtime.CompilerServices; namespace System.Security.Policy { public abstract class EvidenceBase { protected EvidenceBase() { throw new PlatformNotSupportedException(System.SR.PlatformNotSupported_AccessControl); } [System.Runtime.CompilerServices.NullableContext(2)] public virtual EvidenceBase Clone() { throw new PlatformNotSupportedException(System.SR.PlatformNotSupported_AccessControl); } } }