syntax_data: {"ast_node_type":"other","tokens":[{"end":3,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///
context_before: /// - `span.ctxt_or_parent_or_marker == span_data.ctxt` (must be `<= MAX_CTXT`)
context_after: /// Inline-parent format (requires non-huge length, root context, and non-huge parent):