{"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
            let assoc_name = tcx.item_name(assoc_item_def_id);
            let trait_name = tcx.item_name(trait_def_id);
            Some(format!("impl {trait_name}<{assoc_name} = {item_ty}>"))