Dancer2 uses Template::Tiny (whereas Dancer < 2 uses its own Dancer::Template::Simple). However Template::Tiny currently misses some features I need to have my FlashMessage plugin working. These are : - be able to change the start / end tags - be able to evaluate CodeRefs I've opened a ticket and attached patches in the Template::Tiny RT queue. Link for reference : https://rt.cpan.org/Ticket/Display.html?id=79704 dams.