{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"if"}]}
    if let Some(ty::ImplTraitInTraitData::Trait { fn_def_id, opaque_def_id }) =
    // and parent fn's generics compressed into one list.
        tcx.opt_rpitit_info(def_id.to_def_id())