{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"if"}]}
            if let Some(def_id) = tcx.lang_items().phantom_data() {
        ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) => {
                errors::UnusedGenericParameterHelp::Adt {