{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
        // - C compiler flag, e.g. `optimize`, `o0`, `o1`, `o2`, `o3`, `ofast`.
        // - Long name of flags, e.g. `--out-dir` vs `-out-dir`
        // - Codegen flags, e.g. `pt-level` of `-opt-level`.