rustdoc: remove unneeded Box from ItemKind

src/librustdoc/clean/mod.rs

@@ -1080,7 +1080,7 @@ fn clean_trait_item<'tcx>(trait_item: &hir::TraitItem<'tcx>, cx: &mut DocContext
             hir::TraitItemKind::Type(bounds, None) => {
                 let generics = enter_impl_trait(cx, |cx| clean_generics(trait_item.generics, cx));
                 let bounds = bounds.iter().filter_map(|x| clean_generic_bound(x, cx)).collect();
-                TyAssocTypeItem(Box::new(generics), bounds)
+                TyAssocTypeItem(generics, bounds)
             }
         };
         Item::from_def_id_and_parts(local_did, Some(trait_item.ident.name), inner, cx)
@@ -1297,7 +1297,7 @@ pub(crate) fn clean_middle_assoc_item<'tcx>(
                         bounds,
                     )
                 } else {
-                    TyAssocTypeItem(Box::new(generics), bounds)
+                    TyAssocTypeItem(generics, bounds)
                 }
             } else {
                 // FIXME: when could this happen? Associated items in inherent impls?

src/librustdoc/clean/types.rs

@@ -795,7 +795,7 @@ pub(crate) enum ItemKind {
     /// A required associated type in a trait declaration.
     ///
     /// The bounds may be non-empty if there is a `where` clause.
-    TyAssocTypeItem(Box<Generics>, Vec<GenericBound>),
+    TyAssocTypeItem(Generics, Vec<GenericBound>),
     /// An associated type in a trait impl or a provided one in a trait declaration.
     AssocTypeItem(Box<Typedef>, Vec<GenericBound>),
     /// An item that has been stripped by a rustdoc pass

src/librustdoc/json/conversions.rs

@@ -284,7 +284,7 @@ fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: Some(default.expr(tcx)) }
         }
         TyAssocTypeItem(g, b) => ItemEnum::AssocType {
-            generics: (*g).into_tcx(tcx),
+            generics: g.into_tcx(tcx),
             bounds: b.into_tcx(tcx),
             default: None,
         },