syntax_data: {"ast_node_type":"function","tokens":[{"end":80,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn reverse_map_prefix_heuristically(&self, path: &Path) -> Option<PathBuf> {
context_before:     #[instrument(level = "debug", skip(self), ret)]
context_after:         let mut found = None;