{"ast_node_type":"variable","tokens":[{"end":39,"kind":"keyword","start":0,"text":"let"}]}
    let (range, new_name) = match def {
        .ok_or_else(|| format_err!("No identifier available to rename"))?;
        Definition::ExternCrateDecl(decl) if decl.alias(sema.db).is_none() => (