Fix rustdoc breakage

Author: sgrif

src/librustdoc/clean/auto_trait.rs

@@ -684,14 +684,12 @@ impl<'a, 'tcx, 'rcx> AutoTraitFinder<'a, 'tcx, 'rcx> {
             new_env = ty::ParamEnv::new(
                 tcx.mk_predicates(normalized_preds),
                 param_env.reveal,
-                ty::UniverseIndex::ROOT,
             );
         }
 
         let final_user_env = ty::ParamEnv::new(
             tcx.mk_predicates(user_computed_preds.into_iter()),
             user_env.reveal,
-            ty::UniverseIndex::ROOT,
         );
         debug!(
             "evaluate_nested_obligations(ty_did={:?}, trait_did={:?}): succeeded with '{:?}' \