syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // entry contains a position, the only ramification of the above is that we will get cache
context_before:     // Since the containment aspect of this range is only used to see whether or not the cache
context_after:     // misses for these rare positions. A line lookup for the position via `SourceMap::lookup_line`