remove global

tests/send.cm

@@ -1,9 +1,9 @@
 return {
     test_send: function() {
-        $_.start(e => {
+        $start(e => {
           send(e.actor, { message: "Hello! Good to go?" }, msg => {
             log.console(`Original sender got message back: ${msg}. Stopping!`)
-            // $_.stop() // Removed
+            // $stop() // Removed
           })
         }, "tests/reply_actor")
     }