cnum_map: &'x IndexVec<CrateNum, Option<CrateNum>>,
synthetic_expansion_infos: &'x Lock<FxHashMap<AbsoluteBytePos, SyntaxContext>>,
file_index_to_file: &'x Lock<FxHashMap<FileMapIndex, Lrc<FileMap>>>,
cnum_map: &'x IndexVec<CrateNum, Option<CrateNum>>,
synthetic_expansion_infos: &'x Lock<FxHashMap<AbsoluteBytePos, SyntaxContext>>,
file_index_to_file: &'x Lock<FxHashMap<FileMapIndex, Lrc<FileMap>>>,