Also remove #![feature(control_flow_enum)] where possible

Author: scottmcm

compiler/rustc_const_eval/src/lib.rs

@@ -6,7 +6,6 @@ Rust MIR: a lowered representation of Rust.
 
 #![feature(assert_matches)]
 #![feature(box_patterns)]
-#![feature(control_flow_enum)]
 #![feature(decl_macro)]
 #![feature(exact_size_is_empty)]
 #![feature(let_chains)]

compiler/rustc_data_structures/src/lib.rs

@@ -11,7 +11,6 @@
 #![feature(associated_type_bounds)]
 #![feature(auto_traits)]
 #![feature(cell_leak)]
-#![feature(control_flow_enum)]
 #![feature(extend_one)]
 #![feature(hash_raw_entry)]
 #![feature(hasher_prefixfree_extras)]

compiler/rustc_mir_build/src/lib.rs

@@ -5,7 +5,6 @@
 #![feature(assert_matches)]
 #![feature(associated_type_bounds)]
 #![feature(box_patterns)]
-#![feature(control_flow_enum)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(min_specialization)]

compiler/rustc_monomorphize/src/lib.rs

@@ -1,5 +1,4 @@
 #![feature(array_windows)]
-#![feature(control_flow_enum)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]
 #![deny(rustc::untranslatable_diagnostic)]

compiler/rustc_privacy/src/lib.rs

@@ -1,6 +1,5 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(associated_type_defaults)]
-#![feature(control_flow_enum)]
 #![feature(rustc_private)]
 #![feature(try_blocks)]
 #![feature(let_chains)]

compiler/rustc_transmute/src/lib.rs

@@ -1,4 +1,4 @@
-#![feature(alloc_layout_extra, control_flow_enum, decl_macro, iterator_try_reduce, never_type)]
+#![feature(alloc_layout_extra, decl_macro, iterator_try_reduce, never_type)]
 #![allow(dead_code, unused_variables)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]

compiler/rustc_ty_utils/src/lib.rs

@@ -6,7 +6,6 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(let_chains)]
-#![feature(control_flow_enum)]
 #![feature(never_type)]
 #![feature(box_patterns)]
 #![recursion_limit = "256"]