dotnet-core/release-notes/2.1/Preview/api-diff/preview1/2.1-preview1_System.Runtime.CompilerServices.md

System.Runtime.CompilerServices

 namespace System.Runtime.CompilerServices {
     public static class RuntimeFeature {
+        public const string PortablePdb = "PortablePdb";
     }
     public sealed class RuntimeWrappedException : Exception {
+        public RuntimeWrappedException(object thrownObject);
     }
 }