{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
        let blackbox_path = ecx.std_path(&[sym::hint, sym::black_box]);
    ) -> (P<ast::Block>, P<ast::Expr>, P<ast::Expr>, P<ast::Expr>) {
        let noop = ast::InlineAsm {