{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"///"}]}
    /// The extern prelude which contains all root modules of external crates that are in scope.
    // need to be careful with things that block def maps also have.
    extern_prelude: FxIndexMap<Name, (CrateRootModuleId, Option<ExternCrateId>)>,