syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"debug!(\"span_to_lines(sp={:?})\","}]}
source_snippet:         debug!("span_to_lines(sp={:?})", sp);
context_before:     pub fn span_to_lines(&self, sp: Span) -> FileLinesResult {
context_after:         let (lo, hi) = self.is_valid_span(sp)?;