Make bare_trait_object not be an epoch lint

Author: Manishearth

src/librustc_lint/lib.rs

@@ -276,12 +276,7 @@ pub fn register_builtins(store: &mut lint::LintStore, sess: Option<&Session>) {
             id: LintId::of(TYVAR_BEHIND_RAW_POINTER),
             reference: "issue #46906 <https://github.com/rust-lang/rust/issues/46906>",
             epoch: Some(Epoch::Epoch2018),
-        },
-         FutureIncompatibleInfo {
-             id: LintId::of(lint::builtin::BARE_TRAIT_OBJECT),
-             reference: "issue #48457 <https://github.com/rust-lang/rust/issues/48457>",
-             epoch: Some(Epoch::Epoch2018),
-         }
+        }
         ]);
 
     // Register renamed and removed lints