{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"ty::Alias(ty::Opaque"}]}
                ty::Alias(ty::Opaque | ty::Projection, ty::AliasTy { def_id: def, .. }) => {
                ty::Adt(def, _) => is_def_must_use(cx, def.did(), span),
                    elaborate(cx.tcx, cx.tcx.explicit_item_self_bounds(def).iter_identity_copied())