{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"self.dcx().emit_err(errors::FrontmatterUnclosed"}]}
            self.dcx().emit_err(errors::FrontmatterUnclosed {
            let label_span = self.mk_sp(frontmatter_opening_pos, frontmatter_opening_end_pos);
                span: frontmatter_span,