Remove redundant patterns when matching ( x @ _ to x) (clippy::redundant_pattern)

src/librustc_resolve/imports.rs

@@ -1432,7 +1432,7 @@ impl<'a, 'b> ImportResolver<'a, 'b> {
                             }
                             msg
                         }
-                        ref s @ _ => bug!("unexpected import subclass {:?}", s),
+                        ref s => bug!("unexpected import subclass {:?}", s),
                     };
                     let mut err = this.session.struct_span_err(binding.span, &msg);
 

src/librustdoc/html/item_type.rs

@@ -62,7 +62,7 @@ impl<'a> From<&'a clean::Item> for ItemType {
     fn from(item: &'a clean::Item) -> ItemType {
         let inner = match item.inner {
             clean::StrippedItem(box ref item) => item,
-            ref inner @ _ => inner,
+            ref inner => inner,
         };
 
         match *inner {

src/librustdoc/html/render.rs

@@ -2727,7 +2727,7 @@ fn naive_assoc_href(it: &clean::Item, link: AssocItemLink<'_>) -> String {
     let name = it.name.as_ref().unwrap();
     let ty = match it.type_() {
         Typedef | AssocType => AssocType,
-        s @ _ => s,
+        s => s,
     };
 
     let anchor = format!("#{}.{}", ty, name);