{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
        // only differentiates -O0 and -O1. It does not apply to LTO.
        // The -O flag is, as of late 2023, only used for merging of strings and debuginfo, and
        self.link_arg(match self.sess.opts.optimize {