Auto merge of #106023 - JohnTitor:rollup-k8mettz, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - #105584 (add assert messages if chunks/windows are length 0)
 - #105602 (interpret: add read_machine_[ui]size convenience methods)
 - #105824 (str.lines() docstring: clarify that line endings are not returned)
 - #105980 (Refer to "Waker" rather than "RawWaker" in `drop` comment)
 - #105986 (Fix typo in reading_half_a_pointer.rs)
 - #105995 (Add regression test for #96530)
 - #106008 (Sort lint_groups in no_lint_suggestion)
 - #106014 (Add comment explaining what the scrape-examples-toggle.goml GUI test is about)

Failed merges:

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

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -303,15 +303,15 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             }
             sym::offset => {
                 let ptr = self.read_pointer(&args[0])?;
-                let offset_count = self.read_scalar(&args[1])?.to_machine_isize(self)?;
+                let offset_count = self.read_machine_isize(&args[1])?;
                 let pointee_ty = substs.type_at(0);
 
                 let offset_ptr = self.ptr_offset_inbounds(ptr, pointee_ty, offset_count)?;
                 self.write_pointer(offset_ptr, dest)?;
             }
             sym::arith_offset => {
                 let ptr = self.read_pointer(&args[0])?;
-                let offset_count = self.read_scalar(&args[1])?.to_machine_isize(self)?;
+                let offset_count = self.read_machine_isize(&args[1])?;
                 let pointee_ty = substs.type_at(0);
 
                 let pointee_size = i64::try_from(self.layout_of(pointee_ty)?.size.bytes()).unwrap();
@@ -670,7 +670,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         count: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>,
         nonoverlapping: bool,
     ) -> InterpResult<'tcx> {
-        let count = self.read_scalar(&count)?.to_machine_usize(self)?;
+        let count = self.read_machine_usize(&count)?;
         let layout = self.layout_of(src.layout.ty.builtin_deref(true).unwrap().ty)?;
         let (size, align) = (layout.size, layout.align.abi);
         // `checked_mul` enforces a too small bound (the correct one would probably be machine_isize_max),
@@ -698,7 +698,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 
         let dst = self.read_pointer(&dst)?;
         let byte = self.read_scalar(&byte)?.to_u8()?;
-        let count = self.read_scalar(&count)?.to_machine_usize(self)?;
+        let count = self.read_machine_usize(&count)?;
 
         // `checked_mul` enforces a too small bound (the correct one would probably be machine_isize_max),
         // but no actual allocation can be big enough for the difference to be noticeable.

compiler/rustc_const_eval/src/interpret/operand.rs

@@ -404,13 +404,24 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         Ok(self.read_immediate(op)?.to_scalar())
     }
 
+    // Pointer-sized reads are fairly common and need target layout access, so we wrap them in
+    // convenience functions.
+
     /// Read a pointer from a place.
     pub fn read_pointer(
         &self,
         op: &OpTy<'tcx, M::Provenance>,
     ) -> InterpResult<'tcx, Pointer<Option<M::Provenance>>> {
         self.read_scalar(op)?.to_pointer(self)
     }
+    /// Read a pointer-sized unsigned integer from a place.
+    pub fn read_machine_usize(&self, op: &OpTy<'tcx, M::Provenance>) -> InterpResult<'tcx, u64> {
+        self.read_scalar(op)?.to_machine_usize(self)
+    }
+    /// Read a pointer-sized signed integer from a place.
+    pub fn read_machine_isize(&self, op: &OpTy<'tcx, M::Provenance>) -> InterpResult<'tcx, i64> {
+        self.read_scalar(op)?.to_machine_isize(self)
+    }
 
     /// Turn the wide MPlace into a string (must already be dereferenced!)
     pub fn read_str(&self, mplace: &MPlaceTy<'tcx, M::Provenance>) -> InterpResult<'tcx, &str> {

compiler/rustc_const_eval/src/interpret/projection.rs

@@ -363,7 +363,7 @@ where
             Index(local) => {
                 let layout = self.layout_of(self.tcx.types.usize)?;
                 let n = self.local_to_op(self.frame(), local, Some(layout))?;
-                let n = self.read_scalar(&n)?.to_machine_usize(self)?;
+                let n = self.read_machine_usize(&n)?;
                 self.place_index(base, n)?
             }
             ConstantIndex { offset, min_length, from_end } => {
@@ -392,7 +392,7 @@ where
             Index(local) => {
                 let layout = self.layout_of(self.tcx.types.usize)?;
                 let n = self.local_to_op(self.frame(), local, Some(layout))?;
-                let n = self.read_scalar(&n)?.to_machine_usize(self)?;
+                let n = self.read_machine_usize(&n)?;
                 self.operand_index(base, n)?
             }
             ConstantIndex { offset, min_length, from_end } => {

compiler/rustc_lint/src/context.rs

@@ -483,7 +483,16 @@ impl LintStore {
             return CheckLintNameResult::NoLint(Some(Symbol::intern(&name_lower)));
         }
         // ...if not, search for lints with a similar name
-        let groups = self.lint_groups.keys().copied().map(Symbol::intern);
+        // Note: find_best_match_for_name depends on the sort order of its input vector.
+        // To ensure deterministic output, sort elements of the lint_groups hash map.
+        // Also, never suggest deprecated lint groups.
+        let mut groups: Vec<_> = self
+            .lint_groups
+            .iter()
+            .filter_map(|(k, LintGroup { depr, .. })| if depr.is_none() { Some(k) } else { None })
+            .collect();
+        groups.sort();
+        let groups = groups.iter().map(|k| Symbol::intern(k));
         let lints = self.lints.iter().map(|l| Symbol::intern(&l.name_lower()));
         let names: Vec<Symbol> = groups.chain(lints).collect();
         let suggestion = find_best_match_for_name(&names, Symbol::intern(&name_lower), None);

library/core/src/slice/mod.rs

@@ -893,7 +893,7 @@ impl<T> [T] {
     #[stable(feature = "chunks_exact", since = "1.31.0")]
     #[inline]
     pub fn chunks_exact(&self, chunk_size: usize) -> ChunksExact<'_, T> {
-        assert_ne!(chunk_size, 0);
+        assert_ne!(chunk_size, 0, "chunks cannot have a size of zero");
         ChunksExact::new(self, chunk_size)
     }
 
@@ -935,7 +935,7 @@ impl<T> [T] {
     #[stable(feature = "chunks_exact", since = "1.31.0")]
     #[inline]
     pub fn chunks_exact_mut(&mut self, chunk_size: usize) -> ChunksExactMut<'_, T> {
-        assert_ne!(chunk_size, 0);
+        assert_ne!(chunk_size, 0, "chunks cannot have a size of zero");
         ChunksExactMut::new(self, chunk_size)
     }
 
@@ -1017,7 +1017,7 @@ impl<T> [T] {
     #[inline]
     #[must_use]
     pub fn as_chunks<const N: usize>(&self) -> (&[[T; N]], &[T]) {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "chunks cannot have a size of zero");
         let len = self.len() / N;
         let (multiple_of_n, remainder) = self.split_at(len * N);
         // SAFETY: We already panicked for zero, and ensured by construction
@@ -1048,7 +1048,7 @@ impl<T> [T] {
     #[inline]
     #[must_use]
     pub fn as_rchunks<const N: usize>(&self) -> (&[T], &[[T; N]]) {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "chunks cannot have a size of zero");
         let len = self.len() / N;
         let (remainder, multiple_of_n) = self.split_at(self.len() - len * N);
         // SAFETY: We already panicked for zero, and ensured by construction
@@ -1087,7 +1087,7 @@ impl<T> [T] {
     #[unstable(feature = "array_chunks", issue = "74985")]
     #[inline]
     pub fn array_chunks<const N: usize>(&self) -> ArrayChunks<'_, T, N> {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "chunks cannot have a size of zero");
         ArrayChunks::new(self)
     }
 
@@ -1166,7 +1166,7 @@ impl<T> [T] {
     #[inline]
     #[must_use]
     pub fn as_chunks_mut<const N: usize>(&mut self) -> (&mut [[T; N]], &mut [T]) {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "chunks cannot have a size of zero");
         let len = self.len() / N;
         let (multiple_of_n, remainder) = self.split_at_mut(len * N);
         // SAFETY: We already panicked for zero, and ensured by construction
@@ -1203,7 +1203,7 @@ impl<T> [T] {
     #[inline]
     #[must_use]
     pub fn as_rchunks_mut<const N: usize>(&mut self) -> (&mut [T], &mut [[T; N]]) {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "chunks cannot have a size of zero");
         let len = self.len() / N;
         let (remainder, multiple_of_n) = self.split_at_mut(self.len() - len * N);
         // SAFETY: We already panicked for zero, and ensured by construction
@@ -1244,7 +1244,7 @@ impl<T> [T] {
     #[unstable(feature = "array_chunks", issue = "74985")]
     #[inline]
     pub fn array_chunks_mut<const N: usize>(&mut self) -> ArrayChunksMut<'_, T, N> {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "chunks cannot have a size of zero");
         ArrayChunksMut::new(self)
     }
 
@@ -1276,7 +1276,7 @@ impl<T> [T] {
     #[unstable(feature = "array_windows", issue = "75027")]
     #[inline]
     pub fn array_windows<const N: usize>(&self) -> ArrayWindows<'_, T, N> {
-        assert_ne!(N, 0);
+        assert_ne!(N, 0, "windows cannot have a size of zero");
         ArrayWindows::new(self)
     }
 

library/core/src/str/mod.rs

@@ -970,8 +970,10 @@ impl str {
 
     /// An iterator over the lines of a string, as string slices.
     ///
-    /// Lines are ended with either a newline (`\n`) or a carriage return with
-    /// a line feed (`\r\n`).
+    /// Lines are split at line endings that are either newlines (`\n`) or
+    /// sequences of a carriage return followed by a line feed (`\r\n`).
+    ///
+    /// Line terminators are not included in the lines returned by the iterator.
     ///
     /// The final line ending is optional. A string that ends with a final line
     /// ending will return the same lines as an otherwise identical string

library/core/src/task/wake.rs

@@ -104,7 +104,7 @@ pub struct RawWakerVTable {
     /// pointer.
     wake_by_ref: unsafe fn(*const ()),
 
-    /// This function gets called when a [`RawWaker`] gets dropped.
+    /// This function gets called when a [`Waker`] gets dropped.
     ///
     /// The implementation of this function must make sure to release any
     /// resources that are associated with this instance of a [`RawWaker`] and
@@ -151,7 +151,7 @@ impl RawWakerVTable {
     ///
     /// # `drop`
     ///
-    /// This function gets called when a [`RawWaker`] gets dropped.
+    /// This function gets called when a [`Waker`] gets dropped.
     ///
     /// The implementation of this function must make sure to release any
     /// resources that are associated with this instance of a [`RawWaker`] and

src/test/rustdoc-gui/scrape-examples-toggle.goml

@@ -1,3 +1,4 @@
+// This tests checks that the "scraped examples" toggle is working as expected.
 goto: "file://" + |DOC_PATH| + "/scrape_examples/fn.test_many.html"
 
 // Clicking "More examples..." will open additional examples

src/test/ui/typeck/issue-96530.rs

@@ -0,0 +1,20 @@
+struct Person {
+    first_name: String,
+    age: u32,
+}
+
+fn first_woman(man: &Person) -> Person {
+    Person {
+        first_name: "Eve".to_string(),
+        ..man.clone() //~ ERROR: mismatched types
+    }
+}
+
+fn main() {
+    let adam = Person {
+        first_name: "Adam".to_string(),
+        age: 0,
+    };
+
+    let eve = first_woman(&adam);
+}

src/test/ui/typeck/issue-96530.stderr

@@ -0,0 +1,9 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-96530.rs:9:11
+   |
+LL |         ..man.clone()
+   |           ^^^^^^^^^^^ expected struct `Person`, found `&Person`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.

src/tools/miri/src/eval.rs

@@ -233,7 +233,7 @@ impl MainThreadState {
                     this.machine.main_fn_ret_place.unwrap().ptr,
                     this.machine.layouts.isize,
                 );
-                let exit_code = this.read_scalar(&ret_place.into())?.to_machine_isize(this)?;
+                let exit_code = this.read_machine_isize(&ret_place.into())?;
                 // Need to call this ourselves since we are not going to return to the scheduler
                 // loop, and we want the main thread TLS to not show up as memory leaks.
                 this.terminate_active_thread()?;

src/tools/miri/src/shims/env.rs

@@ -321,7 +321,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
         this.assert_target_os_is_unix("getcwd");
 
         let buf = this.read_pointer(buf_op)?;
-        let size = this.read_scalar(size_op)?.to_machine_usize(&*this.tcx)?;
+        let size = this.read_machine_usize(size_op)?;
 
         if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op {
             this.reject_in_isolation("`getcwd`", reject_with)?;

src/tools/miri/src/shims/foreign_items.rs

@@ -485,14 +485,14 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             // Standard C allocation
             "malloc" => {
                 let [size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let size = this.read_scalar(size)?.to_machine_usize(this)?;
+                let size = this.read_machine_usize(size)?;
                 let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C)?;
                 this.write_pointer(res, dest)?;
             }
             "calloc" => {
                 let [items, len] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let items = this.read_scalar(items)?.to_machine_usize(this)?;
-                let len = this.read_scalar(len)?.to_machine_usize(this)?;
+                let items = this.read_machine_usize(items)?;
+                let len = this.read_machine_usize(len)?;
                 let size =
                     items.checked_mul(len).ok_or_else(|| err_ub_format!("overflow during calloc size computation"))?;
                 let res = this.malloc(size, /*zero_init:*/ true, MiriMemoryKind::C)?;
@@ -506,16 +506,16 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             "realloc" => {
                 let [old_ptr, new_size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
                 let old_ptr = this.read_pointer(old_ptr)?;
-                let new_size = this.read_scalar(new_size)?.to_machine_usize(this)?;
+                let new_size = this.read_machine_usize(new_size)?;
                 let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
                 this.write_pointer(res, dest)?;
             }
 
             // Rust allocation
             "__rust_alloc" | "miri_alloc" => {
                 let [size, align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
-                let size = this.read_scalar(size)?.to_machine_usize(this)?;
-                let align = this.read_scalar(align)?.to_machine_usize(this)?;
+                let size = this.read_machine_usize(size)?;
+                let align = this.read_machine_usize(align)?;
 
                 let default = |this: &mut MiriInterpCx<'mir, 'tcx>| {
                     Self::check_alloc_request(size, align)?;
@@ -546,8 +546,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             }
             "__rust_alloc_zeroed" => {
                 let [size, align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
-                let size = this.read_scalar(size)?.to_machine_usize(this)?;
-                let align = this.read_scalar(align)?.to_machine_usize(this)?;
+                let size = this.read_machine_usize(size)?;
+                let align = this.read_machine_usize(align)?;
 
                 return this.emulate_allocator(Symbol::intern("__rg_alloc_zeroed"), |this| {
                     Self::check_alloc_request(size, align)?;
@@ -566,8 +566,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             "__rust_dealloc" | "miri_dealloc" => {
                 let [ptr, old_size, align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
-                let old_size = this.read_scalar(old_size)?.to_machine_usize(this)?;
-                let align = this.read_scalar(align)?.to_machine_usize(this)?;
+                let old_size = this.read_machine_usize(old_size)?;
+                let align = this.read_machine_usize(align)?;
 
                 let default = |this: &mut MiriInterpCx<'mir, 'tcx>| {
                     let memory_kind = match link_name.as_str() {
@@ -596,9 +596,9 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             "__rust_realloc" => {
                 let [ptr, old_size, align, new_size] = this.check_shim(abi, Abi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
-                let old_size = this.read_scalar(old_size)?.to_machine_usize(this)?;
-                let align = this.read_scalar(align)?.to_machine_usize(this)?;
-                let new_size = this.read_scalar(new_size)?.to_machine_usize(this)?;
+                let old_size = this.read_machine_usize(old_size)?;
+                let align = this.read_machine_usize(align)?;
+                let new_size = this.read_machine_usize(new_size)?;
                 // No need to check old_size; we anyway check that they match the allocation.
 
                 return this.emulate_allocator(Symbol::intern("__rg_realloc"), |this| {
@@ -621,7 +621,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let [left, right, n] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
                 let left = this.read_pointer(left)?;
                 let right = this.read_pointer(right)?;
-                let n = Size::from_bytes(this.read_scalar(n)?.to_machine_usize(this)?);
+                let n = Size::from_bytes(this.read_machine_usize(n)?);
 
                 let result = {
                     let left_bytes = this.read_bytes_ptr_strip_provenance(left, n)?;
@@ -641,7 +641,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let [ptr, val, num] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let val = this.read_scalar(val)?.to_i32()?;
-                let num = this.read_scalar(num)?.to_machine_usize(this)?;
+                let num = this.read_machine_usize(num)?;
                 // The docs say val is "interpreted as unsigned char".
                 #[allow(clippy::cast_sign_loss, clippy::cast_possible_truncation)]
                 let val = val as u8;
@@ -664,7 +664,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let [ptr, val, num] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let val = this.read_scalar(val)?.to_i32()?;
-                let num = this.read_scalar(num)?.to_machine_usize(this)?;
+                let num = this.read_machine_usize(num)?;
                 // The docs say val is "interpreted as unsigned char".
                 #[allow(clippy::cast_sign_loss, clippy::cast_possible_truncation)]
                 let val = val as u8;

src/tools/miri/src/shims/intrinsics/mod.rs

@@ -111,7 +111,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let ty_layout = this.layout_of(ty)?;
                 let val_byte = this.read_scalar(val_byte)?.to_u8()?;
                 let ptr = this.read_pointer(ptr)?;
-                let count = this.read_scalar(count)?.to_machine_usize(this)?;
+                let count = this.read_machine_usize(count)?;
                 // `checked_mul` enforces a too small bound (the correct one would probably be machine_isize_max),
                 // but no actual allocation can be big enough for the difference to be noticeable.
                 let byte_count = ty_layout.size.checked_mul(count, this).ok_or_else(|| {
@@ -124,7 +124,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let [ptr, mask] = check_arg_count(args)?;
 
                 let ptr = this.read_pointer(ptr)?;
-                let mask = this.read_scalar(mask)?.to_machine_usize(this)?;
+                let mask = this.read_machine_usize(mask)?;
 
                 let masked_addr = Size::from_bytes(ptr.addr().bytes() & mask);
 

src/tools/miri/src/shims/mod.rs

@@ -80,7 +80,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             return Ok(false);
         }
 
-        let req_align = this.read_scalar(align_op)?.to_machine_usize(this)?;
+        let req_align = this.read_machine_usize(align_op)?;
 
         // Stop if the alignment is not a power of two.
         if !req_align.is_power_of_two() {