module to manage flow of control in Continuation Passing Style

 CPS is a Perl module that enables developers to write code in Continuation
 Passing Style, which is a style of writing code where the normal call/return
 mechanism is replaced by explicit "continuations". It is useful whenever some
 form of asynchronous or event-based programming is in use.
 .
 Note: This module is entirely deprecated now. It is maintained for
 compatibility for any code still using it, but please consider rewriting to
 use Future instead, which offers a far neater method of representing
 asynchronous program and data flow. In addition, Future::AsyncAwait can
 further improve readability of Future-based code by letting it use the
 familiar kinds of Perl control structure while still being asynchronous.