gistfile1.txt

grammar Confusion {
  token TOP { ^ <element> $ }
  rule element { <name> <list> }
  rule list { '(' ~ ')' [ <name> ]+ % ',' }
  rule name { \w+ }
}

class Build {
  method element ($/) { }
# method list ($/) { }
}

say Confusion.parse('html (head, body)', :actions(Build));