   autorun: (f) ->
     throw new Error 'Tracker.autorun requires a function argument' unless typeof f is 'function'
 
-    c = new Tracker.Computation(f, Tracker.currentComputation, privateObject)
+    c = new Tracker.Computation f, Tracker.currentComputation, privateObject
 
     if Tracker.active
       Tracker.onInvalidate ->

# External code can't access this, and so won't be able to directly construct a Tracker.Computation instance
privateObject = {}
nextId = 1
afterFlushCallbacks = []
queue = new Meteor._SynchronousQueue()

      !!Tracker._currentComputation.get()

class Tracker.Computation
  constructor: (f, @_parent, _private) ->
    throw new Error "Tracker.Computation constructor is private; use Tracker.autorun" if _private isnt privateObject

    @stopped = false
    @invalidated = false
