```rust use orgize::{Org, ast::Clock}; let clock = Org::parse("CLOCK: [2003-09-16 Tue 09:39]").first_node:: ().unwrap(); assert!(!clock.is_closed()); let clock = Org::parse("CLOCK: [2003-09-16 Tue 09:39] =>12:00").first_node:: ().unwrap(); assert!(clock.is_closed()); ```
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