{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"file_index_to_file:"}]}
    file_index_to_file: &'a Lock<FxHashMap<SourceFileIndex, Arc<SourceFile>>>,
    opaque: MemDecoder<'a>,
    file_index_to_stable_id: &'a FxHashMap<SourceFileIndex, EncodedSourceFileId>,