This module is confused. It doesn't really know what it wants to be. Source filter for extra OO syntax? Filter for implementing subroutine signatures? Foreign language inlining? HTML templating? HTML inlining? Go on, you'll find a little bit of everything.
That is, if you do, since the documentation struggles to list all of the features, without managing to even attempt a coherent explanation of why and how all the features should be used. Not surprisingly for such a formless amalgamation of unrelated concepts, the module's name is meaningless.
If you think you need this module, you should probably be looking at Perl 6 instead.