--- a/Implab/IPromiseT.cs	Tue Jan 23 19:39:21 2018 +0300
+++ b/Implab/IPromiseT.cs	Wed Jan 24 03:03:21 2018 +0300
@@ -3,23 +3,10 @@
 namespace Implab {
     public interface IPromise<out T> : IPromise {
 
-        IPromise<T> On(Action<T> success, Action<Exception> error, Action<Exception> cancel);
-        
-        IPromise<T> On(Action<T> success, Action<Exception> error);
-
-        IPromise<T> On(Action<T> success);
+        void On(Action<T> success, Action<Exception> error);
 
         new T Join();
 
         new T Join(int timeout);
-
-        new IPromise<T> On(Action success, Action<Exception> error, Action<Exception> cancel);
-
-        new IPromise<T> On(Action success, Action<Exception> error);
-
-        new IPromise<T> On(Action success);
-
-        new IPromise<T> On(Action handler, PromiseEventType events);
-
     }
 }