syntax_data: {"ast_node_type":"import","tokens":[{"end":70,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// the root and towards its use site, as the var index increases.
context_before:     /// `lifetime_depths.start + index`, going away from the
context_after:     /// This is used to flatten rustc's pairing of `BrAnon`