{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"///"}]}
/// is contained in `body_span` and has the same [syntax context] as `body_span`.
/// Walks through the expansion ancestors of `original_span` to find a span that
pub(crate) fn unexpand_into_body_span(original_span: Span, body_span: Span) -> Option<Span> {