Documentation for syntax DOC assembled from the following types:

language documentation Phasers

From Phasers

(Phasers) Asynchronous Phasers DOC DOC

The phasers BEGIN, CHECK and INIT are run only in documentation mode when prefixed with the DOC keyword. The compiler is in documentation mode when run with --doc.

DOC INIT { say 'init'  }  # prints 'init' at initialization time when in documentation mode.