syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"assert!(source_file_end"}]}
source_snippet:         assert!(source_file_end >= last_line_start);
context_before:         let source_file_end = RelativeBytePos::from_usize(src.len());
context_after:         if last_line_start == source_file_end {