Some cleanup

Author: Aaron1011

src/librustc/traits/select.rs

@@ -2748,17 +2748,17 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             }
 
             ty::GeneratorWitness(did, types) => {
-				let use_mir = if did.is_local() {
+                let use_mir = if did.is_local() {
                     self.tcx().features().generator_mir_traits
                 } else {
                     self.tcx().uses_generator_mir_traits(did.krate)
                 };
 
                 if !use_mir {
-					// This is sound because no regions in the witness can refer to
-					// the binder outside the witness. So we'll effectivly reuse
-					// the implicit binder around the witness.
-					return types.skip_binder().to_vec()
+                    // This is sound because no regions in the witness can refer to
+                    // the binder outside the witness. So we'll effectivly reuse
+                    // the implicit binder around the witness.
+                    return types.skip_binder().to_vec()
                 }
                 // Note that we need to use optimized_mir here,
                 // in order to have the `StateTransform` pass run

src/librustc_feature/active.rs

@@ -526,7 +526,7 @@ declare_features! (
     /// Allows using `&mut` in constant functions.
     (active, const_mut_refs, "1.41.0", Some(57349), None),
 
-    (active, generator_mir_traits, "1.41.0", None, None),
+    (active, generator_mir_traits, "1.41.0", Some(0), None),
 
     // -------------------------------------------------------------------------
     // feature-group-end: actual feature gates