rustup https://github.com/rust-lang/rust/pull/67712

slice_patterns have been stabilized.

clippy_lints/src/lib.rs

@@ -3,7 +3,6 @@
 #![feature(box_syntax)]
 #![feature(box_patterns)]
 #![feature(rustc_private)]
-#![feature(slice_patterns)]
 #![feature(stmt_expr_attributes)]
 #![allow(clippy::missing_docs_in_private_items, clippy::must_use_candidate)]
 #![recursion_limit = "512"]

tests/ui/patterns.fixed

@@ -1,7 +1,6 @@
 // run-rustfix
 #![allow(unused)]
 #![warn(clippy::all)]
-#![feature(slice_patterns)]
 
 fn main() {
     let v = Some(true);

tests/ui/patterns.rs

@@ -1,7 +1,6 @@
 // run-rustfix
 #![allow(unused)]
 #![warn(clippy::all)]
-#![feature(slice_patterns)]
 
 fn main() {
     let v = Some(true);

tests/ui/patterns.stderr

@@ -1,5 +1,5 @@
 error: the `y @ _` pattern can be written as just `y`
-  --> $DIR/patterns.rs:11:9
+  --> $DIR/patterns.rs:10:9
    |
 LL |         y @ _ => (),
    |         ^^^^^ help: try: `y`