ometa IndirectLeftRecursion <: Parser {
  digit    = char:d ?(d >= '0' && d <= '9') -> d.digitValue(),
  number   = number:n digit:d               -> (10*n + d)
           | digit,

  x        = term, 
  term     = x:t "+" number:n               -> ['Add', t, n]
           | number
}
IndirectLeftRecursion.matchAll('1+2+3', 'term') 

// I would expect [Add, [Add, 1, 2], 3] as a result instead of 1