librustdoc: Address some clippy lints

Also ignore clippy's "collapsible if..." lints.

src/librustdoc/html/render/mod.rs

@@ -1190,11 +1190,9 @@ fn render_deref_methods(
             }
         }
         render_assoc_items_inner(w, cx, container_item, did, what, derefs);
-    } else {
-        if let Some(prim) = target.primitive_type() {
-            if let Some(&did) = cache.primitive_locations.get(&prim) {
-                render_assoc_items_inner(w, cx, container_item, did, what, derefs);
-            }
+    } else if let Some(prim) = target.primitive_type() {
+        if let Some(&did) = cache.primitive_locations.get(&prim) {
+            render_assoc_items_inner(w, cx, container_item, did, what, derefs);
         }
     }
 }

src/librustdoc/html/render/print_item.rs

@@ -127,12 +127,12 @@ pub(super) fn print_item(cx: &Context<'_>, item: &clean::Item, buf: &mut Buffer,
     };
 
     let item_vars = ItemVars {
-        page: page,
+        page,
         static_root_path: page.get_static_root_path(),
-        typ: typ,
+        typ,
         name: item.name.as_ref().unwrap().as_str(),
         item_type: &item.type_().to_string(),
-        path_components: path_components,
+        path_components,
         stability_since_raw: &stability_since_raw,
         src_href: src_href.as_deref(),
     };

src/librustdoc/lib.rs

@@ -18,6 +18,7 @@
 #![feature(iter_intersperse)]
 #![recursion_limit = "256"]
 #![warn(rustc::internal)]
+#![allow(clippy::collapsible_if, clippy::collapsible_else_if)]
 
 #[macro_use]
 extern crate tracing;

src/librustdoc/passes/stripper.rs

@@ -43,11 +43,10 @@ impl<'a> DocFolder for Stripper<'a> {
             | clean::TraitAliasItem(..)
             | clean::MacroItem(..)
             | clean::ForeignTypeItem => {
-                if i.def_id.is_local() {
-                    if !self.access_levels.is_exported(i.def_id.expect_def_id()) {
-                        debug!("Stripper: stripping {:?} {:?}", i.type_(), i.name);
-                        return None;
-                    }
+                if i.def_id.is_local() && !self.access_levels.is_exported(i.def_id.expect_def_id())
+                {
+                    debug!("Stripper: stripping {:?} {:?}", i.type_(), i.name);
+                    return None;
                 }
             }