Make RSVP#all cancellable.

Cancel all sub promises as soon as cancelled.

lib/rsvp/all.js

@@ -37,6 +37,15 @@ function all(promises) {
         resolveAll(i, promise);
       }
     }
+  }, function() {
+    var promise;
+    for (var i = 0; i < promises.length; i++) {
+      promise = promises[i];
+
+      if (promise && typeof promise.then === 'function') {
+        promise.cancel();
+      }
+    }
   });
 }
 

test/tests/extension_test.js

@@ -691,6 +691,38 @@ describe("RSVP extensions", function() {
         done();
       });
     });
+
+    specify('cancel the array of promise as soon as cancelled', function(done) {
+      var firstResolver, secondResolver;
+
+      var first = new RSVP.Promise(function(resolve, reject) {
+        firstResolver = { resolve: resolve, reject: reject };
+      });
+
+      var second = new RSVP.Promise(function(resolve, reject) {
+        secondResolver = { resolve: resolve, reject: reject };
+      });
+
+      setTimeout(function() {
+        firstResolver.reject({});
+      }, 0);
+
+      setTimeout(function() {
+        secondResolver.resolve(true);
+      }, 5000);
+
+      var all_promise = RSVP.all(["nonPromiseValue", first, second]);
+
+      all_promise.cancel();
+
+      setTimeout(function() {
+        assert(first.isRejected);
+        assert(first.rejectedReason instanceof RSVP.CancellationError);
+        assert(second.isRejected);
+        assert(second.rejectedReason instanceof RSVP.CancellationError);
+        done();
+      }, 20);
+    });
   });
 
   describe("RSVP.reject", function(){