syntax_data: {"ast_node_type":"impl","tokens":[{"end":69,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Option<impl Iterator<Item = (String, &'s SearchPathFile)>> {
context_before:         suffix: &str,
context_after:         let start = self.0.partition_point(|(k, _)| **k < *prefix);