syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// - `span.len_with_tag_or_marker` has top bit (`PARENT_TAG`) set
context_before: ///   (must be `<= MAX_LEN`)
context_after: /// - `span.ctxt_or_parent_or_marker == span_data.parent` (must be `<= MAX_CTXT`)