{"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"//"}]}
    // pick the first CGU as a fallback.
    // If there are no CGUs that have externally linked items, then we just
    let dead_code_cgu = if let Some(cgu) = dead_code_cgu { cgu } else { &mut codegen_units[0] };