diff --git a/js-assembler/runtime-src/baselib-functions.js b/js-assembler/runtime-src/baselib-functions.js
index 86b6b3e..de51c18 100644
--- a/js-assembler/runtime-src/baselib-functions.js
+++ b/js-assembler/runtime-src/baselib-functions.js
@@ -205,12 +205,12 @@
         if (! baselib.arity.isArityMatching(proc.racketArity, args.length - 4)) {
             var msg = baselib.format.format("arity mismatch: ~s expected ~s arguments, but received ~s",
                                             [proc.displayName, proc.racketArity, args.length - 4]);
-            fail(baselib.exceptions.makeExnFailContractArity(msg,
-                                                             MACHINE.captureContinuationMarks()));
+            return fail(baselib.exceptions.makeExnFailContractArity(msg,
+                                                                    MACHINE.captureContinuationMarks()));
         }
 
         if (! isClosure(proc)) {
-            fail(baselib.exceptions.makeExnFail(
+            return fail(baselib.exceptions.makeExnFail(
                 baselib.format.format(
                     "Not a procedure: ~e",
                     [proc]),
@@ -232,7 +232,7 @@
                 MACHINE.v = oldVal;
                 MACHINE.a = oldArgcount;
                 MACHINE.p = oldProc;
-                success(returnValue);
+                return success(returnValue);
             });
         };
         afterGoodInvoke.mvr = function (MACHINE) {
@@ -246,7 +246,7 @@
                 MACHINE.v = oldVal;
                 MACHINE.a = oldArgcount;
                 MACHINE.p = oldProc;
-                success.apply(null, returnValues);
+                return success.apply(null, returnValues);
             });
         };
 
@@ -264,7 +264,7 @@
             MACHINE.p = oldProc;
             MACHINE.c.length = oldControlLength;
             MACHINE.e.length = oldEnvLength;
-            fail(e);
+            return fail(e);
         };
         MACHINE._trampoline(proc.label, 
                             false, 
diff --git a/web-world/js-impl.js b/web-world/js-impl.js
index 82b875f..86ccb79 100644
--- a/web-world/js-impl.js
+++ b/web-world/js-impl.js
@@ -1306,15 +1306,15 @@
                                             mockView,
                                             onGoodWorldUpdate,
                                             fail);
-                    } else if (isArityMatching(racketWorldCallback.racketArity, 2 + args.length)){
+                    } else { //if (isArityMatching(racketWorldCallback.racketArity, 2 + args.length)){
                         console.log("arity match 3");
                         args = ([internalCall, world, mockView]
                                 .concat(args)
                                 .concat([onGoodWorldUpdate, fail]));
                         racketWorldCallback.apply(null, args);
-                    } else {
-                        fail(makeArityMismatchError(MACHINE, racketWorldCallback, 2+args.length));
-                    }
+                    }//  else {
+                    //     fail(makeArityMismatchError(MACHINE, racketWorldCallback, 2+args.length));
+                    // }
                 } else {
                     console.log("dispatched all events");
                     dispatchingEvents = false;