```rust use orgize::{Org, ast::SourceBlock}; let block = Org::parse("#+begin_src c :tangle yes\n#+end_src").first_node:: ().unwrap(); assert_eq!(block.parameters().unwrap(), ":tangle yes"); let block = Org::parse("#+begin_src c :tangle \n#+end_src").first_node:: ().unwrap(); assert_eq!(block.parameters().unwrap(), ":tangle"); let block = Org::parse("#+begin_src c\n#+end
(&self)
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