Rollup merge of #99011 - oli-obk:UnsoundCell, r=eddyb

`UnsafeCell` blocks niches inside its nested type from being available outside fixes #87341 This implements the plan by `@eddyb` in rust-lang/rust#87341 (comment) Somewhat related PR (not strictly necessary, but that cleanup made this PR simpler): #94527
tcdi · Jul 13, 2022 · e515d1c · e515d1c
2 parents 3769a57 + 78fe1bd
commit e515d1c
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diff --git a/core/src/cell.rs b/core/src/cell.rs
@@ -1856,7 +1856,6 @@ impl<T: ?Sized + fmt::Display> fmt::Display for RefMut<'_, T> {
 #[lang = "unsafe_cell"]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[repr(transparent)]
-#[repr(no_niche)] // rust-lang/rust#68303.
 pub struct UnsafeCell<T: ?Sized> {
     value: T,
 }

diff --git a/core/src/lib.rs b/core/src/lib.rs
@@ -191,7 +191,6 @@
 #![feature(never_type)]
 #![feature(no_core)]
 #![feature(no_coverage)] // rust-lang/rust#84605
-#![feature(no_niche)] // rust-lang/rust#68303
 #![feature(platform_intrinsics)]
 #![feature(prelude_import)]
 #![feature(repr_simd)]