syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"lo.touch(self.time_stamp);"}]}
source_snippet:                 lo.touch(self.time_stamp);
context_before:                 let lo = &mut self.line_cache[lo_cache_idx as usize];
context_after:                 (lo_cache_idx as usize, oldest)