Remove unused features

Author: smoelius

clippy_lints/src/lib.rs

@@ -1,13 +1,9 @@
 // error-pattern:cargo-clippy
 
-#![feature(bindings_after_at)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
-#![feature(concat_idents)]
-#![feature(crate_visibility_modifier)]
 #![feature(drain_filter)]
 #![feature(in_band_lifetimes)]
-#![feature(once_cell)]
 #![feature(or_patterns)]
 #![feature(rustc_private)]
 #![feature(stmt_expr_attributes)]

clippy_utils/src/lib.rs

@@ -1,15 +1,8 @@
-#![feature(bindings_after_at)]
 #![feature(box_patterns)]
-#![feature(box_syntax)]
-#![feature(concat_idents)]
-#![feature(crate_visibility_modifier)]
-#![feature(drain_filter)]
 #![feature(in_band_lifetimes)]
 #![feature(once_cell)]
 #![feature(or_patterns)]
 #![feature(rustc_private)]
-#![feature(stmt_expr_attributes)]
-#![feature(control_flow_enum)]
 #![recursion_limit = "512"]
 #![allow(clippy::missing_errors_doc, clippy::missing_panics_doc, clippy::must_use_candidate)]