--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/RejectedPromise`1.cs	Tue Jan 30 01:37:17 2018 +0300
@@ -0,0 +1,52 @@
+using System;
+
+namespace Implab
+{
+    public struct RejectedPromise<T> : IPromise<T> {
+        readonly Exception m_reason;
+
+        public Type ResultType => typeof(void);
+
+        public bool IsResolved => true;
+
+        public bool IsRejected => true;
+
+        public bool IsFulfilled => false;
+
+        public Exception RejectReason => m_reason;
+
+        public RejectedPromise(Exception reason) {
+            m_reason = reason;
+        }
+
+        public IPromise<T2> Cast<T2>() {
+            return (IPromise<T2>)(IPromise<T>)this;
+        }
+
+        void IPromise.Join() {
+            m_reason.ThrowInvocationException();
+        }
+
+        void IPromise.Join(int timeout) {
+            m_reason.ThrowInvocationException();
+        }
+
+        public T Join() {
+            m_reason.ThrowInvocationException();
+            throw new Exception(); // unreachable code
+        }
+
+        public T Join(int timeout) {
+            m_reason.ThrowInvocationException();
+            throw new Exception(); // unreachable code
+        }
+
+        public void Then(IResolvable next) {
+            next.Reject(m_reason);
+        }
+
+        public void Then(IResolvable<T> next) {
+            next.Reject(m_reason);
+        }
+    }
+}
\ No newline at end of file