Rollup merge of rust-lang#140111 - jogru0:redundant_pattern, r=compiler-errors

cleanup redundant pattern instances

Just two small code cleanups.

Author: ChrisDenton

compiler/rustc_transmute/src/layout/tree.rs

@@ -514,7 +514,7 @@ pub(crate) mod rustc {
                 }
             }
             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 @@ impl Hash for Path {
                 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,
                     };
                 }