syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"assert!(span_data.hi"}]}
source_snippet:         assert!(span_data.hi >= hi.line.start);
context_before:         assert!(span_data.lo <= lo.line.end);
context_after:         assert!(span_data.hi <= hi.line.end);