syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"debug_assert_eq!(span,"}]}
source_snippet:         debug_assert_eq!(span, removed_span);
context_before:         let removed_span = self.spans.borrow_mut().entry(feature).or_default().pop().unwrap();
context_after:     }