Auto merge of #127486 - matthiaskrgr:rollup-lvv018b, r=matthiaskrgr

Rollup of 5 pull requests

Successful merges:

 - #120248 (Make casts of pointers to trait objects stricter)
 - #127355 (Mark format! with must_use hint)
 - #127399 (Verify that allocations output by GVN are sufficiently aligned.)
 - #127460 (clarify `sys::unix::fd::FileDesc::drop` comment)
 - #127467 (bootstrap: once_cell::sync::Lazy -> std::sync::LazyLock)

Failed merges:

 - #127357 (Remove `StructuredDiag`)

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

Author: bors

crates/stdx/src/anymap.rs

@@ -68,8 +68,6 @@ pub type RawMap<A> = hash_map::HashMap<TypeId, Box<A>, BuildHasherDefault<TypeId
 /// The type parameter `A` allows you to use a different value type; normally you will want
 /// it to be `core::any::Any` (also known as `std::any::Any`), but there are other choices:
 ///
-/// - If you want the entire map to be cloneable, use `CloneAny` instead of `Any`; with
-///   that, you can only add types that implement `Clone` to the map.
 /// - You can add on `+ Send` or `+ Send + Sync` (e.g. `Map<dyn Any + Send>`) to add those
 ///   auto traits.
 ///
@@ -79,9 +77,6 @@ pub type RawMap<A> = hash_map::HashMap<TypeId, Box<A>, BuildHasherDefault<TypeId
 ///   also spelled [`AnyMap`] for convenience.
 /// - <code>[Map]&lt;dyn [core::any::Any] + Send&gt;</code>
 /// - <code>[Map]&lt;dyn [core::any::Any] + Send + Sync&gt;</code>
-/// - <code>[Map]&lt;dyn [CloneAny]&gt;</code>
-/// - <code>[Map]&lt;dyn [CloneAny] + Send&gt;</code>
-/// - <code>[Map]&lt;dyn [CloneAny] + Send + Sync&gt;</code>
 ///
 /// ## Example
 ///
@@ -205,12 +200,6 @@ mod tests {
         assert_debug::<Map<dyn Any>>();
         assert_debug::<Map<dyn Any + Send>>();
         assert_debug::<Map<dyn Any + Send + Sync>>();
-        assert_send::<Map<dyn CloneAny + Send>>();
-        assert_send::<Map<dyn CloneAny + Send + Sync>>();
-        assert_sync::<Map<dyn CloneAny + Send + Sync>>();
-        assert_debug::<Map<dyn CloneAny>>();
-        assert_debug::<Map<dyn CloneAny + Send>>();
-        assert_debug::<Map<dyn CloneAny + Send + Sync>>();
     }
 
     #[test]
@@ -232,53 +221,6 @@ mod tests {
     }
 }
 
-// impl some traits for dyn Any
-use core::fmt;
-
-#[doc(hidden)]
-pub trait CloneToAny {
-    /// Clone `self` into a new `Box<dyn CloneAny>` object.
-    fn clone_to_any(&self) -> Box<dyn CloneAny>;
-}
-
-impl<T: Any + Clone> CloneToAny for T {
-    #[inline]
-    fn clone_to_any(&self) -> Box<dyn CloneAny> {
-        Box::new(self.clone())
-    }
-}
-
-macro_rules! impl_clone {
-    ($t:ty) => {
-        impl Clone for Box<$t> {
-            #[inline]
-            fn clone(&self) -> Box<$t> {
-                // SAFETY: this dance is to reapply any Send/Sync marker. I’m not happy about this
-                // approach, given that I used to do it in safe code, but then came a dodgy
-                // future-compatibility warning where_clauses_object_safety, which is spurious for
-                // auto traits but still super annoying (future-compatibility lints seem to mean
-                // your bin crate needs a corresponding allow!). Although I explained my plight¹
-                // and it was all explained and agreed upon, no action has been taken. So I finally
-                // caved and worked around it by doing it this way, which matches what’s done for
-                // core::any², so it’s probably not *too* bad.
-                //
-                // ¹ https://github.com/rust-lang/rust/issues/51443#issuecomment-421988013
-                // ² https://github.com/rust-lang/rust/blob/e7825f2b690c9a0d21b6f6d84c404bb53b151b38/library/alloc/src/boxed.rs#L1613-L1616
-                let clone: Box<dyn CloneAny> = (**self).clone_to_any();
-                let raw: *mut dyn CloneAny = Box::into_raw(clone);
-                unsafe { Box::from_raw(raw as *mut $t) }
-            }
-        }
-
-        impl fmt::Debug for $t {
-            #[inline]
-            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                f.pad(stringify!($t))
-            }
-        }
-    };
-}
-
 /// Methods for downcasting from an `Any`-like trait object.
 ///
 /// This should only be implemented on trait objects for subtraits of `Any`, though you can
@@ -350,16 +292,3 @@ macro_rules! implement {
 implement!(Any);
 implement!(Any + Send);
 implement!(Any + Send + Sync);
-
-/// [`Any`], but with cloning.
-///
-/// Every type with no non-`'static` references that implements `Clone` implements `CloneAny`.
-/// See [`core::any`] for more details on `Any` in general.
-pub trait CloneAny: Any + CloneToAny {}
-impl<T: Any + Clone> CloneAny for T {}
-implement!(CloneAny);
-implement!(CloneAny + Send);
-implement!(CloneAny + Send + Sync);
-impl_clone!(dyn CloneAny);
-impl_clone!(dyn CloneAny + Send);
-impl_clone!(dyn CloneAny + Send + Sync);