Reduce rightward drift

src/librustdoc/clean/mod.rs

@@ -1215,24 +1215,23 @@ fn clean_qpath(hir_ty: &hir::Ty<'_>, cx: &mut DocContext<'_>) -> Type {
 }
 
 fn maybe_expand_private_type_alias(cx: &mut DocContext<'_>, path: &hir::Path<'_>) -> Option<Type> {
-    let mut alias = None;
-    if let Res::Def(DefKind::TyAlias, def_id) = path.res {
+    let Res::Def(DefKind::TyAlias, def_id) = path.res else { return None };
     // Substitute private type aliases
-        if let Some(def_id) = def_id.as_local() {
+    let Some(def_id) = def_id.as_local() else { return None };
     let hir_id = cx.tcx.hir().local_def_id_to_hir_id(def_id);
-            if !cx.cache.access_levels.is_exported(def_id.to_def_id()) {
-                alias = Some(&cx.tcx.hir().expect_item(hir_id).kind);
-            }
-        }
+    let alias = if !cx.cache.access_levels.is_exported(def_id.to_def_id()) {
+        &cx.tcx.hir().expect_item(hir_id).kind
+    } else {
+        return None;
     };
+    let hir::ItemKind::TyAlias(ty, generics) = alias else { return None };
 
-    if let Some(&hir::ItemKind::TyAlias(ref ty, ref generics)) = alias {
     let provided_params = &path.segments.last().expect("segments were empty");
     let mut ty_substs = FxHashMap::default();
     let mut lt_substs = FxHashMap::default();
     let mut ct_substs = FxHashMap::default();
     let generic_args = provided_params.args();
-        {
+
     let mut indices: hir::GenericParamCount = Default::default();
     for param in generics.params.iter() {
         match param.kind {
@@ -1300,11 +1299,8 @@ fn maybe_expand_private_type_alias(cx: &mut DocContext<'_>, path: &hir::Path<'_>
             }
         }
     }
-        }
+
     Some(cx.enter_alias(ty_substs, lt_substs, ct_substs, |cx| ty.clean(cx)))
-    } else {
-        None
-    }
 }
 
 impl Clean<Type> for hir::Ty<'_> {

src/librustdoc/lib.rs

@@ -9,6 +9,7 @@
 #![feature(control_flow_enum)]
 #![feature(box_syntax)]
 #![feature(in_band_lifetimes)]
+#![feature(let_else)]
 #![feature(nll)]
 #![feature(test)]
 #![feature(crate_visibility_modifier)]