{"ast_node_type":"variable","tokens":[{"end":96,"kind":"keyword","start":0,"text":"let"}]}
                    let usages = FindUsages::find_nodes(this.sema, name, file_id, &tree, offset)
                for offset in FindUsages::match_indices(&file_text, finder, search_range) {
                        .filter_map(ast::NameRef::cast);