--- a/Implab/Safe.cs	Fri Apr 13 00:44:57 2018 +0300
+++ b/Implab/Safe.cs	Fri Apr 13 03:57:39 2018 +0300
@@ -7,6 +7,7 @@
 using System.Collections;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
+using System.Threading;
 
 #if NET_4_5
 using System.Threading.Tasks;
@@ -151,6 +152,21 @@
         public static void NoWait<T>(Task<T> promise) {
         }
 
+        public static void Noop() {
+        }
+
+        public static void Noop(CancellationToken ct) {
+            ct.ThrowIfCancellationRequested();
+        }
+
+        public static Task CreateTask() {
+            return new Task(Noop);
+        }
+
+        public static Task CreateTask(CancellationToken ct) {
+            return new Task(Noop, ct);
+        }
+
         [DebuggerStepThrough]
         public static IPromise<T> Run<T>(Func<IPromise<T>> action) {
             ArgumentNotNull(action, "action");
@@ -162,10 +178,5 @@
             }
         }
 
-#if NET_4_5
-        public static void NoWait(Task t) {
-        }
-#endif
-
     }
 }