Remove a couple of unused feature enables

compiler/rustc_infer/src/lib.rs

@@ -27,8 +27,6 @@
 #![feature(iterator_try_collect)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
-#![feature(try_blocks)]
-#![feature(yeet_expr)]
 #![recursion_limit = "512"] // For rustdoc
 // tidy-alphabetical-end
 

compiler/rustc_macros/src/lib.rs

@@ -1,7 +1,5 @@
 // tidy-alphabetical-start
-#![allow(internal_features)]
 #![allow(rustc::default_hash_types)]
-#![feature(allow_internal_unstable)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(never_type)]