Auto merge of #120242 - matthiaskrgr:rollup-a93yj3i, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #117910 (Refactor uses of `objc_msgSend` to no longer have clashing definitions)
 - #118639 (Undeprecate lint `unstable_features` and make use of it in the compiler)
 - #119801 (Fix deallocation with wrong allocator in (A)Rc::from_box_in)
 - #120058 (bootstrap: improvements for compiler builds)
 - #120059 (Make generic const type mismatches not hide trait impls from the trait solver)
 - #120097 (Report unreachable subpatterns consistently)
 - #120137 (Validate AggregateKind types in MIR)
 - #120164 (`maybe_lint_impl_trait`: separate `is_downgradable` from `is_object_safe`)
 - #120181 (Allow any `const` expression blocks in `thread_local!`)
 - #120218 (rustfmt: Check that a token can begin a nonterminal kind before parsing it as a macro arg)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 3 insertions, 2 deletions

diff --git a/compiler/rustc_parse_format/src/lib.rs b/compiler/rustc_parse_format/src/lib.rs
index 1e1d45d6f70..625764876a6 100644
--- a/compiler/rustc_parse_format/src/lib.rs
+++ b/compiler/rustc_parse_format/src/lib.rs
@@ -11,8 +11,9 @@
 )]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
-// WARNING: We want to be able to build this crate with a stable compiler,
-//          so no `#![feature]` attributes should be added!
+// We want to be able to build this crate with a stable compiler,
+// so no `#![feature]` attributes should be added.
+#![deny(unstable_features)]
 
 use rustc_lexer::unescape;
 pub use Alignment::*;