{"ast_node_type":"other","tokens":[{"end":107,"kind":"keyword","start":0,"text":"self.validate_frontmatter(start,"}]}
                    self.validate_frontmatter(start, has_invalid_preceding_whitespace, invalid_infostring);
                rustc_lexer::TokenKind::Frontmatter { has_invalid_preceding_whitespace, invalid_infostring } => {
                    preceded_by_whitespace = true;