ro.first_class_continuation">first-class
      continuation</a>
    </h4>
<p>
      A first-class continuation can be passed as an argument, returned by a function
      and stored in a data structure to be used later. In some implementations (for
      instance C# <span class="emphasis"><em>yield</em></span>) the continuation can not be directly
      accessed or directly manipulated.
    </p>
<p>
      Without stackfulness and first-class semantics, some useful execution control
      flows cannot be supp