{"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
        let candidate = field_name.syntax().parent().and_then(ast::RecordPatField::cast)?;
    pub fn for_field_name_ref(field_name: &ast::NameRef) -> Option<ast::RecordPatField> {
        match candidate.field_name()? {