{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
        let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
    pub fn expr_ok(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
        self.expr_call_global(sp, ok, thin_vec![expr])