The 'Vim syntax file'
./vim/syntax/asciidoc3.vim
was not edited - except 'let b:current_syntax = "asciidoc3" ',
and should work with AsciiDoc3, too.
Thx to the contributors!
Author: Stuart Rackham <srackham@gmail.com> (inspired by Felix
Obenhuber's original asciidoc.vim script).
See userguide 'appendix e: 'vim syntax highlighter'
