{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
    let assign_stmt = make::expr_stmt(make::expr_assignment(lhs, rhs));
    let rhs = make::expr_path(make::ext::ident_path(field_name));
    let body = make::block_expr([assign_stmt.into()], None);