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, 1 insertions, 0 deletions

diff --git a/src/tools/rustfmt/tests/source/macros/rewrite-const-item.rs b/src/tools/rustfmt/tests/source/macros/rewrite-const-item.rs
new file mode 100644
index 00000000000..3db2c26ab5a
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/macros/rewrite-const-item.rs
@@ -0,0 +1 @@
+m!(const N: usize = 0;);