syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"debug!(\"char"}]}
source_snippet:                 debug!("char pos {:?} is on the line at char pos {:?}", chpos, linechpos);
context_before:                 debug!("byte pos {:?} is on the line at byte pos {:?}", pos, linebpos);
context_after:                 debug!("byte is on line: {}", line);