==================
Unknown first flow header cannot rebase to nested statements
==================
flow first:
  repeat =
    run worker
    until: Ready.
  ## Following.
  run after
## Next.
flow next:
  pass

---

(program
  (flow
    (runnable_name)
    (newline)
    (flow_body
      (ERROR)
      (blank_line)
      (ERROR)
      (blank_line)
      (ERROR)
      (blank_line)
      (item_doc
        (text))
      (run_statement
        (runnable_name)
        (newline))))
  (item_doc
    (text))
  (flow
    (runnable_name)
    (newline)
    (flow_body
      (newline))))

==================
Unknown first agic header cannot rebase to nested messages
==================
agic first:
  modles += fast
    user: Orphaned content.
  ## Following.
  user: Following.
## Next.
flow next:
  pass

---

(program
  (agic
    (runnable_name)
    (newline)
    (agic_body
      (ERROR)
      (blank_line)
      (ERROR)
      (blank_line)
      (item_doc
        (text))
      (message
        (role)
        (content
          (text))
        (newline))))
  (item_doc
    (text))
  (flow
    (runnable_name)
    (newline)
    (flow_body
      (newline))))
