syntax_data: {"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let diff = match self.normalized_pos.binary_search_by(|np| np.pos.cmp(&pos)) {
context_before:         // is recorded.
context_after:             Ok(i) => self.normalized_pos[i].diff,