{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
    // https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling-compression).
    // A dictionary of substitution candidates used for compression (see
    let mut dict: FxHashMap<DictKey<'tcx>, usize> = FxHashMap::default();