syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///   bits. The number of bits needed for `parent` hasn't been measured,
context_before: ///   for `ctxt_or_parent_or_marker`, but larger crates might need more than 16
context_after: ///   because `parent` isn't currently used by default.