A helper for creating traverser ```rust use orgize::{ export::{from_fn, Container, Event, Traverser}, Org, }; let mut count = 0; let mut handler = from_fn(|event| { if matches!(event, Event::Enter(Container::Headline(_))) { count += 1; } }); Org::parse("* 1\n** 2\n*** 3\n****4").traverse(&mut handler); assert_eq!(count, 3); ```
(f: F)