cleanup redundant pattern instances

compiler/rustc_transmute/src/layout/tree.rs

@@ -514,7 +514,7 @@ fn ty_field<'tcx>(
                 }
             }
             ty::Tuple(fields) => fields[i.as_usize()],
-            kind @ _ => unimplemented!(
+            kind => unimplemented!(
                 "only a subset of `Ty::ty_and_layout_field`'s functionality is implemented. implementation needed for {:?}",
                 kind
             ),

library/std/src/path.rs

@@ -3265,7 +3265,7 @@ fn hash<H: Hasher>(&self, h: &mut H) {
                 if !verbatim {
                     component_start += match tail {
                         [b'.'] => 1,
-                        [b'.', sep @ _, ..] if is_sep_byte(*sep) => 1,
+                        [b'.', sep, ..] if is_sep_byte(*sep) => 1,
                         _ => 0,
                     };
                 }