Auto merge of rust-lang#102520 - matthiaskrgr:rollup-7nreat0, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#102276 (Added more const_closure functionality)
 - rust-lang#102382 (Manually order `DefId` on 64-bit big-endian)
 - rust-lang#102421 (remove the unused :: between trait and type to give user correct diag…)
 - rust-lang#102495 (Reinstate `hir-stats.rs` test for stage 1.)
 - rust-lang#102505 (rustdoc: remove no-op CSS `h3.variant, .sub-variant h4 { border-bottom: none }`)
 - rust-lang#102506 (Specify `DynKind::Dyn`)

Failed merges:

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

Author: bors

compiler/rustc_span/src/def_id.rs

@@ -218,7 +218,9 @@ impl<D: Decoder> Decodable<D> for DefIndex {
 /// index and a def index.
 ///
 /// You can create a `DefId` from a `LocalDefId` using `local_def_id.to_def_id()`.
-#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Copy)]
+#[derive(Clone, PartialEq, Eq, Copy)]
+// Don't derive order on 64-bit big-endian, so we can be consistent regardless of field order.
+#[cfg_attr(not(all(target_pointer_width = "64", target_endian = "big")), derive(PartialOrd, Ord))]
 // On below-64 bit systems we can simply use the derived `Hash` impl
 #[cfg_attr(not(target_pointer_width = "64"), derive(Hash))]
 #[repr(C)]
@@ -260,6 +262,22 @@ impl Hash for DefId {
     }
 }
 
+// Implement the same comparison as derived with the other field order.
+#[cfg(all(target_pointer_width = "64", target_endian = "big"))]
+impl Ord for DefId {
+    #[inline]
+    fn cmp(&self, other: &DefId) -> std::cmp::Ordering {
+        Ord::cmp(&(self.index, self.krate), &(other.index, other.krate))
+    }
+}
+#[cfg(all(target_pointer_width = "64", target_endian = "big"))]
+impl PartialOrd for DefId {
+    #[inline]
+    fn partial_cmp(&self, other: &DefId) -> Option<std::cmp::Ordering> {
+        Some(Ord::cmp(self, other))
+    }
+}
+
 impl DefId {
     /// Makes a local `DefId` from the given `DefIndex`.
     #[inline]

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

@@ -2263,13 +2263,22 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
                                     trait_impls.non_blanket_impls().len()
                                 )
                             };
-
+                            let mut suggestions = vec![(
+                                trait_path_segment.ident.span.shrink_to_lo(),
+                                format!("<{} as ", self.tcx.def_path(impl_def_id).to_string_no_crate_verbose())
+                            )];
+                            if let Some(generic_arg) = trait_path_segment.args {
+                                let between_span = trait_path_segment.ident.span.between(generic_arg.span_ext);
+                                // get rid of :: between Trait and <type>
+                                // must be '::' between them, otherwise the parser won't accept the code
+                                suggestions.push((between_span, "".to_string(),));
+                                suggestions.push((generic_arg.span_ext.shrink_to_hi(), format!(">")));
+                            } else {
+                                suggestions.push((trait_path_segment.ident.span.shrink_to_hi(), format!(">")));
+                            }
                             err.multipart_suggestion(
                                 message,
-                                vec![
-                                    (trait_path_segment.ident.span.shrink_to_lo(), format!("<{} as ", self.tcx.def_path(impl_def_id).to_string_no_crate_verbose())),
-                                    (trait_path_segment.ident.span.shrink_to_hi(), format!(">"))
-                                ],
+                                suggestions,
                                 Applicability::MaybeIncorrect
                             );
                         }

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

@@ -1425,7 +1425,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
         let mut spans_and_needs_box = vec![];
 
         match liberated_sig.output().kind() {
-            ty::Dynamic(predicates, _, _) => {
+            ty::Dynamic(predicates, _, ty::Dyn) => {
                 let cause = ObligationCause::misc(ret_ty.span, fn_hir_id);
                 let param_env = ty::ParamEnv::empty();
 

library/core/src/const_closure.rs

@@ -16,15 +16,18 @@ use crate::marker::Destruct;
 /// assert!(7 == cl(2));
 /// assert!(8 == cl(1));
 /// ```
-pub(crate) struct ConstFnMutClosure<'a, CapturedData: ?Sized, Function> {
-    data: &'a mut CapturedData,
-    func: Function,
+pub(crate) struct ConstFnMutClosure<CapturedData, Function> {
+    /// The Data captured by the Closure.
+    /// Must be either a (mutable) reference or a tuple of (mutable) references.
+    pub data: CapturedData,
+    /// The Function of the Closure, must be: Fn(CapturedData, ClosureArgs) -> ClosureReturn
+    pub func: Function,
 }
-
-impl<'a, CapturedData: ?Sized, Function> ConstFnMutClosure<'a, CapturedData, Function> {
+impl<'a, CapturedData: ?Sized, Function> ConstFnMutClosure<&'a mut CapturedData, Function> {
     /// Function for creating a new closure.
     ///
     /// `data` is the a mutable borrow of data that is captured from the environment.
+    /// If you want Data to be a tuple of mutable Borrows, the struct must be constructed manually.
     ///
     /// `func` is the function of the closure, it gets the data and a tuple of the arguments closure
     ///   and return the return value of the closure.
@@ -39,25 +42,36 @@ impl<'a, CapturedData: ?Sized, Function> ConstFnMutClosure<'a, CapturedData, Fun
     }
 }
 
-impl<'a, CapturedData: ?Sized, ClosureArguments, Function, ClosureReturnValue> const
-    FnOnce<ClosureArguments> for ConstFnMutClosure<'a, CapturedData, Function>
-where
-    Function:
-        ~const Fn(&mut CapturedData, ClosureArguments) -> ClosureReturnValue + ~const Destruct,
-{
-    type Output = ClosureReturnValue;
+macro_rules! impl_fn_mut_tuple {
+    ($($var:ident)*) => {
+        #[allow(unused_parens)]
+        impl<'a, $($var,)* ClosureArguments, Function, ClosureReturnValue> const
+            FnOnce<ClosureArguments> for ConstFnMutClosure<($(&'a mut $var),*), Function>
+        where
+            Function: ~const Fn(($(&mut $var),*), ClosureArguments) -> ClosureReturnValue+ ~const Destruct,
+        {
+            type Output = ClosureReturnValue;
 
-    extern "rust-call" fn call_once(mut self, args: ClosureArguments) -> Self::Output {
-        self.call_mut(args)
-    }
-}
-
-impl<'a, CapturedData: ?Sized, ClosureArguments, Function, ClosureReturnValue> const
-    FnMut<ClosureArguments> for ConstFnMutClosure<'a, CapturedData, Function>
-where
-    Function: ~const Fn(&mut CapturedData, ClosureArguments) -> ClosureReturnValue,
-{
-    extern "rust-call" fn call_mut(&mut self, args: ClosureArguments) -> Self::Output {
-        (self.func)(self.data, args)
-    }
+            extern "rust-call" fn call_once(mut self, args: ClosureArguments) -> Self::Output {
+            self.call_mut(args)
+            }
+        }
+        #[allow(unused_parens)]
+        impl<'a, $($var,)* ClosureArguments, Function, ClosureReturnValue> const
+            FnMut<ClosureArguments> for ConstFnMutClosure<($(&'a mut $var),*), Function>
+        where
+            Function: ~const Fn(($(&mut $var),*), ClosureArguments)-> ClosureReturnValue,
+        {
+            extern "rust-call" fn call_mut(&mut self, args: ClosureArguments) -> Self::Output {
+                #[allow(non_snake_case)]
+                let ($($var),*) = &mut self.data;
+                (self.func)(($($var),*), args)
+            }
+        }
+    };
 }
+impl_fn_mut_tuple!(A);
+impl_fn_mut_tuple!(A B);
+impl_fn_mut_tuple!(A B C);
+impl_fn_mut_tuple!(A B C D);
+impl_fn_mut_tuple!(A B C D E);

library/core/src/ops/try_trait.rs

@@ -379,7 +379,7 @@ pub(crate) type ChangeOutputType<T, V> = <<T as Try>::Residual as Residual<V>>::
 pub(crate) struct NeverShortCircuit<T>(pub T);
 
 impl<T> NeverShortCircuit<T> {
-    /// Wrap a binary `FnMut` to return its result wrapped in a `NeverShortCircuit`.
+    /// Implementation for building `ConstFnMutClosure` for wrapping the output of a ~const FnMut in a `NeverShortCircuit`.
     #[inline]
     pub const fn wrap_mut_2_imp<A, B, F: ~const FnMut(A, B) -> T>(
         f: &mut F,

src/librustdoc/html/static/css/rustdoc.css

@@ -1245,13 +1245,11 @@ h3.variant {
 	font-weight: 600;
 	font-size: 1.125rem;
 	margin-bottom: 10px;
-	border-bottom: none;
 }
 
 .sub-variant h4 {
 	font-size: 1rem;
 	font-weight: 400;
-	border-bottom: none;
 	margin-top: 0;
 	margin-bottom: 0;
 }

src/test/ui/stats/hir-stats.rs

@@ -1,7 +1,6 @@
 // check-pass
 // compile-flags: -Zhir-stats
 // only-x86_64
-// ignore-stage1
 
 // The aim here is to include at least one of every different type of top-level
 // AST/HIR node reported by `-Zhir-stats`.

src/test/ui/type/issue-101866.rs

@@ -0,0 +1,15 @@
+trait TraitA<T> {
+    fn func();
+}
+
+struct StructA {}
+
+impl TraitA<i32> for StructA {
+    fn func() {}
+}
+
+fn main() {
+    TraitA::<i32>::func();
+    //~^ ERROR: cannot call associated function on trait without specifying the corresponding `impl` type [E0790]
+    //~| help: use the fully-qualified path to the only available implementation
+}

src/test/ui/type/issue-101866.stderr

@@ -0,0 +1,18 @@
+error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type
+  --> $DIR/issue-101866.rs:12:5
+   |
+LL |     fn func();
+   |     ---------- `TraitA::func` defined here
+...
+LL |     TraitA::<i32>::func();
+   |     ^^^^^^^^^^^^^^^^^^^ cannot call associated function of trait
+   |
+help: use the fully-qualified path to the only available implementation
+   |
+LL -     TraitA::<i32>::func();
+LL +     <::StructA as TraitA<i32>>::func();
+   |
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0790`.