/// a wrong way to match lines...
/// produces an infinite number of lines

ometa M {
  eol = '\n' | end,
  line = (~eol char)*:a eol -> a.join(''),
  document = line*
}
test = "line1\nbbbb\nccc\nline4";
alert(M.matchAll(test, "document"));


/// a right way

ometa M {
  eol = '\n',
  line = (~eol char)*:a eol -> a.join('')
       | char+:a end        -> a.join(''),
  document = line*
}
test = "line1\nbbbb\nccc\nline4";
alert(M.matchAll(test, "document"));