Check if step has changed since since enqueuing RELEASE

Author: Felix Schlitter

src/Effect/Aff.js

@@ -455,7 +455,7 @@ var Aff = function () {
                 result   = util.fromRight(step);
                 // We need to enqueue the Release with the same interrupt
                 // status as the Bracket that is initiating it.
-                attempts = new Aff(CONS, new Aff(RELEASE, attempt._2, result), attempts, tmp);
+                attempts = new Aff(CONS, new Aff(RELEASE, attempt._2, step), attempts, tmp);
                 // We should only coninue as long as the interrupt status has not changed or
                 // we are currently within a non-interruptable finalizer.
                 if (interrupt === tmp || bracketCount > 0) {
@@ -474,16 +474,17 @@ var Aff = function () {
               // since we enqueued the item, and the bracket count is 0. If the
               // bracket count is non-zero then we are in a masked state so it's
               // impossible to be killed.
+              var v = util.fromRight(attempt._2);
               if (interrupt && interrupt !== tmp && bracketCount === 0) {
-               if (step == null || util.isLeft(step)) {
-                 step = attempt._1.killed(util.fromLeft(interrupt))(attempt._2);
+               if (step == attempt._2 || step == null || util.isLeft(step)) {
+                 step = attempt._1.killed(util.fromLeft(interrupt))(v);
                } else {
-                 step = attempt._1.completed(util.fromRight(step))(attempt._2);
+                 step = attempt._1.completed(util.fromRight(step))(v);
                }
              } else if (fail) {
-                step = attempt._1.failed(util.fromLeft(fail))(attempt._2);
+                step = attempt._1.failed(util.fromLeft(fail))(v);
               } else {
-                step = attempt._1.completed(util.fromRight(step))(attempt._2);
+                step = attempt._1.completed(util.fromRight(step))(v);
               }
               fail = null;
               bracketCount++;