Auto merge of rust-lang#130871 - matthiaskrgr:rollup-2cfpxt7, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#130820 (Fix diagnostics for coroutines with () as input.)
 - rust-lang#130833 (Fix the misleading diagnostic for `let_underscore_drop` on type without `Drop` implementation)
 - rust-lang#130845 (Utf8Chunks: add link to Utf8Chunk)
 - rust-lang#130860 (Fix directives for lint-non-snake-case-crate)
 - rust-lang#130861 (Use `mem::offset_of!` for `sockaddr_un.sun_path`)
 - rust-lang#130865 (Use `&raw` in the standard library)
 - rust-lang#130868 (Update FIXME comment in s390x_unknown_linux_*.rs)

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

Author: bors

compiler/rustc_lint/messages.ftl

@@ -531,7 +531,7 @@ lint_non_binding_let_multi_suggestion =
     consider immediately dropping the value
 
 lint_non_binding_let_on_drop_type =
-    non-binding let on a type that implements `Drop`
+    non-binding let on a type that has a destructor
 
 lint_non_binding_let_on_sync_lock = non-binding let on a synchronization lock
     .label = this lock is not assigned to a binding and is immediately dropped

compiler/rustc_lint/src/let_underscore.rs

@@ -51,7 +51,7 @@ declare_lint! {
     /// intent.
     pub LET_UNDERSCORE_DROP,
     Allow,
-    "non-binding let on a type that implements `Drop`"
+    "non-binding let on a type that has a destructor"
 }
 
 declare_lint! {

compiler/rustc_target/src/spec/targets/s390x_unknown_linux_gnu.rs

@@ -6,9 +6,8 @@ pub(crate) fn target() -> Target {
     base.endian = Endian::Big;
     // z10 is the oldest CPU supported by LLVM
     base.cpu = "z10".into();
-    // FIXME: The ABI implementation in cabi_s390x.rs is for now hard-coded to assume the no-vector
-    // ABI. Pass the -vector feature string to LLVM to respect this assumption. On LLVM < 16, we
-    // also strip v128 from the data_layout below to match the older LLVM's expectation.
+    // FIXME: The ABI implementation in abi/call/s390x.rs is for now hard-coded to assume the no-vector
+    // ABI. Pass the -vector feature string to LLVM to respect this assumption.
     base.features = "-vector".into();
     base.max_atomic_width = Some(128);
     base.min_global_align = Some(16);

compiler/rustc_target/src/spec/targets/s390x_unknown_linux_musl.rs

@@ -6,9 +6,8 @@ pub(crate) fn target() -> Target {
     base.endian = Endian::Big;
     // z10 is the oldest CPU supported by LLVM
     base.cpu = "z10".into();
-    // FIXME: The ABI implementation in cabi_s390x.rs is for now hard-coded to assume the no-vector
-    // ABI. Pass the -vector feature string to LLVM to respect this assumption. On LLVM < 16, we
-    // also strip v128 from the data_layout below to match the older LLVM's expectation.
+    // FIXME: The ABI implementation in abi/call/s390x.rs is for now hard-coded to assume the no-vector
+    // ABI. Pass the -vector feature string to LLVM to respect this assumption.
     base.features = "-vector".into();
     base.max_atomic_width = Some(128);
     base.min_global_align = Some(16);

compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs

@@ -2635,49 +2635,47 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         // This shouldn't be common unless manually implementing one of the
         // traits manually, but don't make it more confusing when it does
         // happen.
-        Ok(
-            if Some(expected_trait_ref.def_id) != self.tcx.lang_items().coroutine_trait()
-                && not_tupled
-            {
-                self.report_and_explain_type_error(
-                    TypeTrace::trait_refs(
-                        &obligation.cause,
-                        true,
-                        expected_trait_ref,
-                        found_trait_ref,
-                    ),
-                    ty::error::TypeError::Mismatch,
-                )
-            } else if found.len() == expected.len() {
-                self.report_closure_arg_mismatch(
-                    span,
-                    found_span,
-                    found_trait_ref,
-                    expected_trait_ref,
-                    obligation.cause.code(),
-                    found_node,
-                    obligation.param_env,
-                )
-            } else {
-                let (closure_span, closure_arg_span, found) = found_did
-                    .and_then(|did| {
-                        let node = self.tcx.hir().get_if_local(did)?;
-                        let (found_span, closure_arg_span, found) =
-                            self.get_fn_like_arguments(node)?;
-                        Some((Some(found_span), closure_arg_span, found))
-                    })
-                    .unwrap_or((found_span, None, found));
-
-                self.report_arg_count_mismatch(
+        if Some(expected_trait_ref.def_id) != self.tcx.lang_items().coroutine_trait() && not_tupled
+        {
+            return Ok(self.report_and_explain_type_error(
+                TypeTrace::trait_refs(&obligation.cause, true, expected_trait_ref, found_trait_ref),
+                ty::error::TypeError::Mismatch,
+            ));
+        }
+        if found.len() != expected.len() {
+            let (closure_span, closure_arg_span, found) = found_did
+                .and_then(|did| {
+                    let node = self.tcx.hir().get_if_local(did)?;
+                    let (found_span, closure_arg_span, found) = self.get_fn_like_arguments(node)?;
+                    Some((Some(found_span), closure_arg_span, found))
+                })
+                .unwrap_or((found_span, None, found));
+
+            // If the coroutine take a single () as its argument,
+            // the trait argument would found the coroutine take 0 arguments,
+            // but get_fn_like_arguments would give 1 argument.
+            // This would result in "Expected to take 1 argument, but it takes 1 argument".
+            // Check again to avoid this.
+            if found.len() != expected.len() {
+                return Ok(self.report_arg_count_mismatch(
                     span,
                     closure_span,
                     expected,
                     found,
                     found_trait_ty.is_closure(),
                     closure_arg_span,
-                )
-            },
-        )
+                ));
+            }
+        }
+        Ok(self.report_closure_arg_mismatch(
+            span,
+            found_span,
+            found_trait_ref,
+            expected_trait_ref,
+            obligation.cause.code(),
+            found_node,
+            obligation.param_env,
+        ))
     }
 
     /// Given some node representing a fn-like thing in the HIR map,

library/alloc/src/boxed.rs

@@ -199,7 +199,7 @@ use core::ops::{
     DerefPure, DispatchFromDyn, Receiver,
 };
 use core::pin::{Pin, PinCoerceUnsized};
-use core::ptr::{self, NonNull, Unique, addr_of_mut};
+use core::ptr::{self, NonNull, Unique};
 use core::task::{Context, Poll};
 use core::{borrow, fmt, slice};
 
@@ -1277,7 +1277,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     #[inline]
     pub fn into_raw(b: Self) -> *mut T {
         // Make sure Miri realizes that we transition from a noalias pointer to a raw pointer here.
-        unsafe { addr_of_mut!(*&mut *Self::into_raw_with_allocator(b).0) }
+        unsafe { &raw mut *&mut *Self::into_raw_with_allocator(b).0 }
     }
 
     /// Consumes the `Box`, returning a wrapped `NonNull` pointer.
@@ -1396,7 +1396,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
         // want *no* aliasing requirements here!
         // In case `A` *is* `Global`, this does not quite have the right behavior; `into_raw`
         // works around that.
-        let ptr = addr_of_mut!(**b);
+        let ptr = &raw mut **b;
         let alloc = unsafe { ptr::read(&b.1) };
         (ptr, alloc)
     }
@@ -1506,7 +1506,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     pub fn as_mut_ptr(b: &mut Self) -> *mut T {
         // This is a primitive deref, not going through `DerefMut`, and therefore not materializing
         // any references.
-        ptr::addr_of_mut!(**b)
+        &raw mut **b
     }
 
     /// Returns a raw pointer to the `Box`'s contents.
@@ -1554,7 +1554,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     pub fn as_ptr(b: &Self) -> *const T {
         // This is a primitive deref, not going through `DerefMut`, and therefore not materializing
         // any references.
-        ptr::addr_of!(**b)
+        &raw const **b
     }
 
     /// Returns a reference to the underlying allocator.

library/alloc/src/boxed/thin.rs

@@ -186,7 +186,7 @@ impl<T: ?Sized> ThinBox<T> {
 
     fn with_header(&self) -> &WithHeader<<T as Pointee>::Metadata> {
         // SAFETY: both types are transparent to `NonNull<u8>`
-        unsafe { &*(core::ptr::addr_of!(self.ptr) as *const WithHeader<_>) }
+        unsafe { &*((&raw const self.ptr) as *const WithHeader<_>) }
     }
 }
 

library/alloc/src/collections/btree/node.rs

@@ -72,8 +72,8 @@ impl<K, V> LeafNode<K, V> {
         // be both slightly faster and easier to track in Valgrind.
         unsafe {
             // parent_idx, keys, and vals are all MaybeUninit
-            ptr::addr_of_mut!((*this).parent).write(None);
-            ptr::addr_of_mut!((*this).len).write(0);
+            (&raw mut (*this).parent).write(None);
+            (&raw mut (*this).len).write(0);
         }
     }
 
@@ -114,7 +114,7 @@ impl<K, V> InternalNode<K, V> {
         unsafe {
             let mut node = Box::<Self, _>::new_uninit_in(alloc);
             // We only need to initialize the data; the edges are MaybeUninit.
-            LeafNode::init(ptr::addr_of_mut!((*node.as_mut_ptr()).data));
+            LeafNode::init(&raw mut (*node.as_mut_ptr()).data);
             node.assume_init()
         }
     }
@@ -525,8 +525,8 @@ impl<'a, K, V, Type> NodeRef<marker::ValMut<'a>, K, V, Type> {
         // to avoid aliasing with outstanding references to other elements,
         // in particular, those returned to the caller in earlier iterations.
         let leaf = Self::as_leaf_ptr(&mut self);
-        let keys = unsafe { ptr::addr_of!((*leaf).keys) };
-        let vals = unsafe { ptr::addr_of_mut!((*leaf).vals) };
+        let keys = unsafe { &raw const (*leaf).keys };
+        let vals = unsafe { &raw mut (*leaf).vals };
         // We must coerce to unsized array pointers because of Rust issue #74679.
         let keys: *const [_] = keys;
         let vals: *mut [_] = vals;

library/alloc/src/rc.rs

@@ -787,7 +787,7 @@ impl<T, A: Allocator> Rc<T, A> {
 
         let strong = unsafe {
             let inner = init_ptr.as_ptr();
-            ptr::write(ptr::addr_of_mut!((*inner).value), data);
+            ptr::write(&raw mut (*inner).value, data);
 
             let prev_value = (*inner).strong.get();
             debug_assert_eq!(prev_value, 0, "No prior strong references should exist");
@@ -1442,7 +1442,7 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
         // SAFETY: This cannot go through Deref::deref or Rc::inner because
         // this is required to retain raw/mut provenance such that e.g. `get_mut` can
         // write through the pointer after the Rc is recovered through `from_raw`.
-        unsafe { ptr::addr_of_mut!((*ptr).value) }
+        unsafe { &raw mut (*ptr).value }
     }
 
     /// Constructs an `Rc<T, A>` from a raw pointer in the provided allocator.
@@ -2042,8 +2042,8 @@ impl<T: ?Sized> Rc<T> {
         unsafe {
             debug_assert_eq!(Layout::for_value_raw(inner), layout);
 
-            ptr::addr_of_mut!((*inner).strong).write(Cell::new(1));
-            ptr::addr_of_mut!((*inner).weak).write(Cell::new(1));
+            (&raw mut (*inner).strong).write(Cell::new(1));
+            (&raw mut (*inner).weak).write(Cell::new(1));
         }
 
         Ok(inner)
@@ -2072,8 +2072,8 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
 
             // Copy value as bytes
             ptr::copy_nonoverlapping(
-                core::ptr::addr_of!(*src) as *const u8,
-                ptr::addr_of_mut!((*ptr).value) as *mut u8,
+                (&raw const *src) as *const u8,
+                (&raw mut (*ptr).value) as *mut u8,
                 value_size,
             );
 
@@ -2107,11 +2107,7 @@ impl<T> Rc<[T]> {
     unsafe fn copy_from_slice(v: &[T]) -> Rc<[T]> {
         unsafe {
             let ptr = Self::allocate_for_slice(v.len());
-            ptr::copy_nonoverlapping(
-                v.as_ptr(),
-                ptr::addr_of_mut!((*ptr).value) as *mut T,
-                v.len(),
-            );
+            ptr::copy_nonoverlapping(v.as_ptr(), (&raw mut (*ptr).value) as *mut T, v.len());
             Self::from_ptr(ptr)
         }
     }
@@ -2149,7 +2145,7 @@ impl<T> Rc<[T]> {
             let layout = Layout::for_value_raw(ptr);
 
             // Pointer to first element
-            let elems = ptr::addr_of_mut!((*ptr).value) as *mut T;
+            let elems = (&raw mut (*ptr).value) as *mut T;
 
             let mut guard = Guard { mem: NonNull::new_unchecked(mem), elems, layout, n_elems: 0 };
 
@@ -2577,7 +2573,7 @@ impl<T: ?Sized + fmt::Debug, A: Allocator> fmt::Debug for Rc<T, A> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized, A: Allocator> fmt::Pointer for Rc<T, A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Pointer::fmt(&core::ptr::addr_of!(**self), f)
+        fmt::Pointer::fmt(&(&raw const **self), f)
     }
 }
 
@@ -2718,7 +2714,7 @@ impl<T, A: Allocator> From<Vec<T, A>> for Rc<[T], A> {
             let (vec_ptr, len, cap, alloc) = v.into_raw_parts_with_alloc();
 
             let rc_ptr = Self::allocate_for_slice_in(len, &alloc);
-            ptr::copy_nonoverlapping(vec_ptr, ptr::addr_of_mut!((*rc_ptr).value) as *mut T, len);
+            ptr::copy_nonoverlapping(vec_ptr, (&raw mut (*rc_ptr).value) as *mut T, len);
 
             // Create a `Vec<T, &A>` with length 0, to deallocate the buffer
             // without dropping its contents or the allocator
@@ -3084,7 +3080,7 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
             // SAFETY: if is_dangling returns false, then the pointer is dereferenceable.
             // The payload may be dropped at this point, and we have to maintain provenance,
             // so use raw pointer manipulation.
-            unsafe { ptr::addr_of_mut!((*ptr).value) }
+            unsafe { &raw mut (*ptr).value }
         }
     }
 

library/alloc/src/sync.rs

@@ -797,7 +797,7 @@ impl<T, A: Allocator> Arc<T, A> {
         // reference into a strong reference.
         let strong = unsafe {
             let inner = init_ptr.as_ptr();
-            ptr::write(ptr::addr_of_mut!((*inner).data), data);
+            ptr::write(&raw mut (*inner).data, data);
 
             // The above write to the data field must be visible to any threads which
             // observe a non-zero strong count. Therefore we need at least "Release" ordering
@@ -1583,7 +1583,7 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
         // SAFETY: This cannot go through Deref::deref or RcBoxPtr::inner because
         // this is required to retain raw/mut provenance such that e.g. `get_mut` can
         // write through the pointer after the Rc is recovered through `from_raw`.
-        unsafe { ptr::addr_of_mut!((*ptr).data) }
+        unsafe { &raw mut (*ptr).data }
     }
 
     /// Constructs an `Arc<T, A>` from a raw pointer.
@@ -1955,8 +1955,8 @@ impl<T: ?Sized> Arc<T> {
         debug_assert_eq!(unsafe { Layout::for_value_raw(inner) }, layout);
 
         unsafe {
-            ptr::addr_of_mut!((*inner).strong).write(atomic::AtomicUsize::new(1));
-            ptr::addr_of_mut!((*inner).weak).write(atomic::AtomicUsize::new(1));
+            (&raw mut (*inner).strong).write(atomic::AtomicUsize::new(1));
+            (&raw mut (*inner).weak).write(atomic::AtomicUsize::new(1));
         }
 
         inner
@@ -1986,8 +1986,8 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
 
             // Copy value as bytes
             ptr::copy_nonoverlapping(
-                core::ptr::addr_of!(*src) as *const u8,
-                ptr::addr_of_mut!((*ptr).data) as *mut u8,
+                (&raw const *src) as *const u8,
+                (&raw mut (*ptr).data) as *mut u8,
                 value_size,
             );
 
@@ -2022,7 +2022,7 @@ impl<T> Arc<[T]> {
         unsafe {
             let ptr = Self::allocate_for_slice(v.len());
 
-            ptr::copy_nonoverlapping(v.as_ptr(), ptr::addr_of_mut!((*ptr).data) as *mut T, v.len());
+            ptr::copy_nonoverlapping(v.as_ptr(), (&raw mut (*ptr).data) as *mut T, v.len());
 
             Self::from_ptr(ptr)
         }
@@ -2061,7 +2061,7 @@ impl<T> Arc<[T]> {
             let layout = Layout::for_value_raw(ptr);
 
             // Pointer to first element
-            let elems = ptr::addr_of_mut!((*ptr).data) as *mut T;
+            let elems = (&raw mut (*ptr).data) as *mut T;
 
             let mut guard = Guard { mem: NonNull::new_unchecked(mem), elems, layout, n_elems: 0 };
 
@@ -2805,7 +2805,7 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
             // SAFETY: if is_dangling returns false, then the pointer is dereferenceable.
             // The payload may be dropped at this point, and we have to maintain provenance,
             // so use raw pointer manipulation.
-            unsafe { ptr::addr_of_mut!((*ptr).data) }
+            unsafe { &raw mut (*ptr).data }
         }
     }
 
@@ -3428,7 +3428,7 @@ impl<T: ?Sized + fmt::Debug, A: Allocator> fmt::Debug for Arc<T, A> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized, A: Allocator> fmt::Pointer for Arc<T, A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Pointer::fmt(&core::ptr::addr_of!(**self), f)
+        fmt::Pointer::fmt(&(&raw const **self), f)
     }
 }
 
@@ -3678,7 +3678,7 @@ impl<T, A: Allocator + Clone> From<Vec<T, A>> for Arc<[T], A> {
             let (vec_ptr, len, cap, alloc) = v.into_raw_parts_with_alloc();
 
             let rc_ptr = Self::allocate_for_slice_in(len, &alloc);
-            ptr::copy_nonoverlapping(vec_ptr, ptr::addr_of_mut!((*rc_ptr).data) as *mut T, len);
+            ptr::copy_nonoverlapping(vec_ptr, (&raw mut (*rc_ptr).data) as *mut T, len);
 
             // Create a `Vec<T, &A>` with length 0, to deallocate the buffer
             // without dropping its contents or the allocator

library/alloc/src/vec/into_iter.rs

@@ -21,11 +21,11 @@ use crate::raw_vec::RawVec;
 macro non_null {
     (mut $place:expr, $t:ident) => {{
         #![allow(unused_unsafe)] // we're sometimes used within an unsafe block
-        unsafe { &mut *(ptr::addr_of_mut!($place) as *mut NonNull<$t>) }
+        unsafe { &mut *((&raw mut $place) as *mut NonNull<$t>) }
     }},
     ($place:expr, $t:ident) => {{
         #![allow(unused_unsafe)] // we're sometimes used within an unsafe block
-        unsafe { *(ptr::addr_of!($place) as *const NonNull<$t>) }
+        unsafe { *((&raw const $place) as *const NonNull<$t>) }
     }},
 }