syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"assert_eq!(file_lines.lines.len(),"}]}
source_snippet:     assert_eq!(file_lines.lines.len(), 1);
context_before:     assert_eq!(file_lines.file.name, PathBuf::from("blork.rs").into());
context_after:     assert_eq!(file_lines.lines[0].line_index, 1);