Adjust cfgs

clippy_dev/src/lib.rs

@@ -1,4 +1,3 @@
-#![cfg_attr(bootstrap, feature(let_chains))]
 #![feature(let_else)]
 #![feature(once_cell)]
 #![feature(rustc_private)]

clippy_lints/src/lib.rs

@@ -4,7 +4,6 @@
 #![feature(control_flow_enum)]
 #![feature(drain_filter)]
 #![feature(iter_intersperse)]
-#![cfg_attr(bootstrap, feature(let_chains))]
 #![feature(let_else)]
 #![feature(lint_reasons)]
 #![feature(never_type)]

clippy_utils/src/lib.rs

@@ -2,7 +2,6 @@
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
 #![feature(let_else)]
-#![cfg_attr(bootstrap, feature(let_chains))]
 #![feature(lint_reasons)]
 #![feature(once_cell)]
 #![feature(rustc_private)]

src/driver.rs

@@ -95,7 +95,7 @@ struct ClippyCallbacks {
 
 impl rustc_driver::Callbacks for ClippyCallbacks {
     // JUSTIFICATION: necessary in clippy driver to set `mir_opt_level`
-    #[cfg_attr(not(bootstrap), allow(rustc::bad_opt_access))]
+    #[allow(rustc::bad_opt_access)]
     fn config(&mut self, config: &mut interface::Config) {
         let previous = config.register_lints.take();
         let clippy_args_var = self.clippy_args_var.take();