Remove unused features

compiler/rustc_middle/src/lib.rs

@@ -33,7 +33,6 @@
 #![feature(discriminant_kind)]
 #![feature(exhaustive_patterns)]
 #![feature(coroutines)]
-#![feature(get_mut_unchecked)]
 #![feature(if_let_guard)]
 #![feature(inline_const)]
 #![feature(iter_from_coroutine)]
@@ -50,19 +49,14 @@
 #![feature(rustc_attrs)]
 #![feature(control_flow_enum)]
 #![cfg_attr(not(bootstrap), feature(trait_upcasting))]
-#![feature(trusted_step)]
 #![feature(try_blocks)]
-#![feature(try_reserve_kind)]
-#![feature(nonzero_ops)]
 #![feature(decl_macro)]
 #![feature(extract_if)]
 #![feature(intra_doc_pointers)]
 #![feature(yeet_expr)]
 #![feature(const_option)]
-#![feature(trait_alias)]
 #![feature(ptr_alignment_type)]
 #![feature(macro_metavar_expr)]
-#![recursion_limit = "512"]
 #![allow(rustc::potential_query_instability)]
 #![allow(internal_features)]