Ignore default reject handler when looking for reject handlers.

src/promise.js

Index: src/promise.js
diff --git a/src/promise.js b/src/promise.js
index 2d8314a42fa5d8d5b0ec05638efec2d9a5ccbf03..bbc832d0f446cc62372e1ba3b883b3786bb70058 100644
--- a/src/promise.js
+++ b/src/promise.js
@@ -324,12 +324,23 @@ var lastMicrotaskId = 0;
 
 
   // Utility for debugger
+  
+  function PromiseHasRejectHandlerRecursive(promise) {
+    var queue = GET_PRIVATE(promise, promiseOnReject);
+    if (IS_UNDEFINED(queue)) return false;
+    // Do a depth first search for a reject handler that's not
+    // the default PromiseIdRejectHandler.
+    for (var i = 0; i < queue.length; i += 2) {
+      if (queue[i] != PromiseIdRejectHandler) return true;
+      if (PromiseHasRejectHandlerRecursive(queue[i + 1])) return true;
+    }
+    return false;
+  }
 
   PromiseHasRejectHandler = function PromiseHasRejectHandler() {
     // Mark promise as already having triggered a reject event.
     SET_PRIVATE(this, promiseDebug, true);
-    var queue = GET_PRIVATE(this, promiseOnReject);
-    return !IS_UNDEFINED(queue) && queue.length > 0;
+    return PromiseHasRejectHandlerRecursive(this);
   };
 
   // -------------------------------------------------------------------