1 files changed, 4 insertions, 3 deletions
diff --git a/js/src/tests/ecma_6/shell.js b/js/src/tests/ecma_6/shell.js
index 4da9221d6..756da9f36 100644
--- a/js/src/tests/ecma_6/shell.js
+++ b/js/src/tests/ecma_6/shell.js
@@ -21,10 +21,11 @@
 
     /** Make an iterator with a return method. */
     global.makeIterator = function makeIterator(overrides) {
+        var throwMethod;
+        if (overrides && overrides.throw)
+            throwMethod = overrides.throw;
         var iterator = {
-            throw: function(e) {
-                throw e;
-            },
+            throw: throwMethod,
             next: function(x) {
                 if (overrides && overrides.next)
                     return overrides.next(x);