anchor.diff:  depending on that will happen inside the catch handler.
   
   
  -==== Collections of promises
  +=== Working with collections
   
   In some circumstances you will want wait a completion of few promises at same time, and _futura_
   also provides helpers for that:
  
positive.code: [funcool/futura "0.2.0"]
  ----
  
  == User Guide
  
  
  === Promises
  
  Is the abstraction that represents the result of an asynchronous operation that will be eventually
  available.
  
negative.code: ----
  
  
  === Subscription as channel
  
  One interesting thing is that open subscriptions can be used as channels so them are fully compatible
  for usage in _core.async_ go block like any other channel:
  