syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // lookup will be a miss. So we only do lookups for nodes up the parent chain, where
context_before:             // `orig_id` passed in to this function is almost always previously unseen, for which a
context_after:             // cache lookups have a very high hit rate.