syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // the root (most of them do) and saves us from retracing many sub-paths
context_before:     // node along the way. This cache records which nodes trace all the way to
context_after:     // many times, and rechecking many nodes.