syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"assert_eq!(sf.lookup_line(RelativeBytePos(26)),"}]}
source_snippet:     assert_eq!(sf.lookup_line(RelativeBytePos(26)), Some(2));
context_before:     assert_eq!(sf.lookup_line(RelativeBytePos(25)), Some(2));
context_after: }