Rollup of 11 pull requests

.github/workflows/ci.yml

@@ -72,6 +72,9 @@ jobs:
       - name: decide whether to skip this job
         run: src/ci/scripts/should-skip-this.sh
         if: success() && !env.SKIP_JOB
+      - name: ensure the channel matches the target branch
+        run: src/ci/scripts/verify-channel.sh
+        if: success() && !env.SKIP_JOB
       - name: configure GitHub Actions to kill the build when outdated
         uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
         with:
@@ -434,6 +437,9 @@ jobs:
       - name: decide whether to skip this job
         run: src/ci/scripts/should-skip-this.sh
         if: success() && !env.SKIP_JOB
+      - name: ensure the channel matches the target branch
+        run: src/ci/scripts/verify-channel.sh
+        if: success() && !env.SKIP_JOB
       - name: configure GitHub Actions to kill the build when outdated
         uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
         with:
@@ -541,6 +547,9 @@ jobs:
       - name: decide whether to skip this job
         run: src/ci/scripts/should-skip-this.sh
         if: success() && !env.SKIP_JOB
+      - name: ensure the channel matches the target branch
+        run: src/ci/scripts/verify-channel.sh
+        if: success() && !env.SKIP_JOB
       - name: configure GitHub Actions to kill the build when outdated
         uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
         with:

compiler/rustc_builtin_macros/src/deriving/cmp/eq.rs

@@ -15,20 +15,12 @@ pub fn expand_deriving_eq(
     item: &Annotatable,
     push: &mut dyn FnMut(Annotatable),
 ) {
+    let span = cx.with_def_site_ctxt(span);
     let inline = cx.meta_word(span, sym::inline);
-    let no_coverage_ident =
-        rustc_ast::attr::mk_nested_word_item(Ident::new(sym::no_coverage, span));
-    let no_coverage_feature =
-        rustc_ast::attr::mk_list_item(Ident::new(sym::feature, span), vec![no_coverage_ident]);
-    let no_coverage = cx.meta_word(span, sym::no_coverage);
     let hidden = rustc_ast::attr::mk_nested_word_item(Ident::new(sym::hidden, span));
     let doc = rustc_ast::attr::mk_list_item(Ident::new(sym::doc, span), vec![hidden]);
-    let attrs = vec![
-        cx.attribute(inline),
-        cx.attribute(no_coverage_feature),
-        cx.attribute(no_coverage),
-        cx.attribute(doc),
-    ];
+    let no_coverage = cx.meta_word(span, sym::no_coverage);
+    let attrs = vec![cx.attribute(inline), cx.attribute(doc), cx.attribute(no_coverage)];
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),

compiler/rustc_feature/src/builtin_attrs.rs

@@ -273,13 +273,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         template!(List: "address, memory, thread"),
         experimental!(no_sanitize)
     ),
-    ungated!(
-        // Not exclusively gated at the crate level (though crate-level is
-        // supported). The feature can alternatively be enabled on individual
-        // functions.
-        no_coverage, AssumedUsed,
-        template!(Word),
-    ),
+    gated!(no_coverage, AssumedUsed, template!(Word), experimental!(no_coverage)),
 
     // FIXME: #14408 assume docs are used since rustdoc looks at them.
     ungated!(doc, AssumedUsed, template!(List: "hidden|inline|...", NameValueStr: "string")),

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -2398,9 +2398,6 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                 self.tcx.associated_item(def_id).ident
             ),
             infer::EarlyBoundRegion(_, name) => format!(" for lifetime parameter `{}`", name),
-            infer::BoundRegionInCoherence(name) => {
-                format!(" for lifetime parameter `{}` in coherence check", name)
-            }
             infer::UpvarRegion(ref upvar_id, _) => {
                 let var_name = self.tcx.hir().name(upvar_id.var_path.hir_id);
                 format!(" for capture of `{}` by closure", var_name)

compiler/rustc_infer/src/infer/mod.rs

@@ -453,8 +453,6 @@ pub enum RegionVariableOrigin {
 
     UpvarRegion(ty::UpvarId, Span),
 
-    BoundRegionInCoherence(Symbol),
-
     /// This origin is used for the inference variables that we create
     /// during NLL region processing.
     Nll(NllRegionVariableOrigin),
@@ -1749,7 +1747,6 @@ impl RegionVariableOrigin {
             | EarlyBoundRegion(a, ..)
             | LateBoundRegion(a, ..)
             | UpvarRegion(_, a) => a,
-            BoundRegionInCoherence(_) => rustc_span::DUMMY_SP,
             Nll(..) => bug!("NLL variable used with `span`"),
         }
     }

compiler/rustc_mir/src/interpret/intrinsics.rs

@@ -323,7 +323,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 self.write_scalar(result, dest)?;
             }
             sym::copy => {
-                self.copy(&args[0], &args[1], &args[2], /*nonoverlapping*/ false)?;
+                self.copy_intrinsic(&args[0], &args[1], &args[2], /*nonoverlapping*/ false)?;
             }
             sym::offset => {
                 let ptr = self.read_scalar(&args[0])?.check_init()?;
@@ -530,4 +530,36 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         )?;
         Ok(offset_ptr)
     }
+
+    /// Copy `count*size_of::<T>()` many bytes from `*src` to `*dst`.
+    pub(crate) fn copy_intrinsic(
+        &mut self,
+        src: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::PointerTag>,
+        dst: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::PointerTag>,
+        count: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::PointerTag>,
+        nonoverlapping: bool,
+    ) -> InterpResult<'tcx> {
+        let count = self.read_scalar(&count)?.to_machine_usize(self)?;
+        let layout = self.layout_of(src.layout.ty.builtin_deref(true).unwrap().ty)?;
+        let (size, align) = (layout.size, layout.align.abi);
+        let size = size.checked_mul(count, self).ok_or_else(|| {
+            err_ub_format!(
+                "overflow computing total size of `{}`",
+                if nonoverlapping { "copy_nonoverlapping" } else { "copy" }
+            )
+        })?;
+
+        // Make sure we check both pointers for an access of the total size and aligment,
+        // *even if* the total size is 0.
+        let src =
+            self.memory.check_ptr_access(self.read_scalar(&src)?.check_init()?, size, align)?;
+
+        let dst =
+            self.memory.check_ptr_access(self.read_scalar(&dst)?.check_init()?, size, align)?;
+
+        if let (Some(src), Some(dst)) = (src, dst) {
+            self.memory.copy(src, dst, size, nonoverlapping)?;
+        }
+        Ok(())
+    }
 }

compiler/rustc_mir/src/interpret/step.rs

@@ -2,7 +2,6 @@
 //!
 //! The main entry point is the `step` method.
 
-use crate::interpret::OpTy;
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::{InterpResult, Scalar};
 use rustc_target::abi::LayoutOf;
@@ -119,7 +118,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let src = self.eval_operand(src, None)?;
                 let dst = self.eval_operand(dst, None)?;
                 let count = self.eval_operand(count, None)?;
-                self.copy(&src, &dst, &count, /* nonoverlapping */ true)?;
+                self.copy_intrinsic(&src, &dst, &count, /* nonoverlapping */ true)?;
             }
 
             // Statements we do not track.
@@ -149,37 +148,6 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         Ok(())
     }
 
-    pub(crate) fn copy(
-        &mut self,
-        src: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::PointerTag>,
-        dst: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::PointerTag>,
-        count: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::PointerTag>,
-        nonoverlapping: bool,
-    ) -> InterpResult<'tcx> {
-        let count = self.read_scalar(&count)?.to_machine_usize(self)?;
-        let layout = self.layout_of(src.layout.ty.builtin_deref(true).unwrap().ty)?;
-        let (size, align) = (layout.size, layout.align.abi);
-        let size = size.checked_mul(count, self).ok_or_else(|| {
-            err_ub_format!(
-                "overflow computing total size of `{}`",
-                if nonoverlapping { "copy_nonoverlapping" } else { "copy" }
-            )
-        })?;
-
-        // Make sure we check both pointers for an access of the total size and aligment,
-        // *even if* the total size is 0.
-        let src =
-            self.memory.check_ptr_access(self.read_scalar(&src)?.check_init()?, size, align)?;
-
-        let dst =
-            self.memory.check_ptr_access(self.read_scalar(&dst)?.check_init()?, size, align)?;
-
-        if let (Some(src), Some(dst)) = (src, dst) {
-            self.memory.copy(src, dst, size, nonoverlapping)?;
-        }
-        Ok(())
-    }
-
     /// Evaluate an assignment statement.
     ///
     /// There is no separate `eval_rvalue` function. Instead, the code for handling each rvalue

compiler/rustc_parse/src/parser/ty.rs

@@ -470,7 +470,7 @@ impl<'a> Parser<'a> {
     /// Is a `dyn B0 + ... + Bn` type allowed here?
     fn is_explicit_dyn_type(&mut self) -> bool {
         self.check_keyword(kw::Dyn)
-            && (self.token.uninterpolated_span().rust_2018()
+            && (!self.token.uninterpolated_span().rust_2015()
                 || self.look_ahead(1, |t| {
                     t.can_begin_bound() && !can_continue_type_after_non_fn_ident(t)
                 }))
@@ -539,7 +539,21 @@ impl<'a> Parser<'a> {
     ) -> PResult<'a, GenericBounds> {
         let mut bounds = Vec::new();
         let mut negative_bounds = Vec::new();
-        while self.can_begin_bound() {
+
+        while self.can_begin_bound() || self.token.is_keyword(kw::Dyn) {
+            if self.token.is_keyword(kw::Dyn) {
+                // Account for `&dyn Trait + dyn Other`.
+                self.struct_span_err(self.token.span, "invalid `dyn` keyword")
+                    .help("`dyn` is only needed at the start of a trait `+`-separated list")
+                    .span_suggestion(
+                        self.token.span,
+                        "remove this keyword",
+                        String::new(),
+                        Applicability::MachineApplicable,
+                    )
+                    .emit();
+                self.bump();
+            }
             match self.parse_generic_bound()? {
                 Ok(bound) => bounds.push(bound),
                 Err(neg_sp) => negative_bounds.push(neg_sp),
@@ -721,7 +735,26 @@ impl<'a> Parser<'a> {
         let lifetime_defs = self.parse_late_bound_lifetime_defs()?;
         let path = self.parse_path(PathStyle::Type)?;
         if has_parens {
-            self.expect(&token::CloseDelim(token::Paren))?;
+            if self.token.is_like_plus() {
+                // Someone has written something like `&dyn (Trait + Other)`. The correct code
+                // would be `&(dyn Trait + Other)`, but we don't have access to the appropriate
+                // span to suggest that. When written as `&dyn Trait + Other`, an appropriate
+                // suggestion is given.
+                let bounds = vec![];
+                self.parse_remaining_bounds(bounds, true)?;
+                self.expect(&token::CloseDelim(token::Paren))?;
+                let sp = vec![lo, self.prev_token.span];
+                let sugg: Vec<_> = sp.iter().map(|sp| (*sp, String::new())).collect();
+                self.struct_span_err(sp, "incorrect braces around trait bounds")
+                    .multipart_suggestion(
+                        "remove the parentheses",
+                        sugg,
+                        Applicability::MachineApplicable,
+                    )
+                    .emit();
+            } else {
+                self.expect(&token::CloseDelim(token::Paren))?;
+            }
         }
 
         let modifier = modifiers.to_trait_bound_modifier();

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

@@ -1044,8 +1044,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     }
 
     /// Returns `true` if the global caches can be used.
-    /// Do note that if the type itself is not in the
-    /// global tcx, the local caches will be used.
     fn can_use_global_caches(&self, param_env: ty::ParamEnv<'tcx>) -> bool {
         // If there are any inference variables in the `ParamEnv`, then we
         // always use a cache local to this particular scope. Otherwise, we

compiler/rustc_typeck/src/collect.rs

@@ -2661,8 +2661,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
     let mut inline_span = None;
     let mut link_ordinal_span = None;
     let mut no_sanitize_span = None;
-    let mut no_coverage_feature_enabled = false;
-    let mut no_coverage_attr = None;
     for attr in attrs.iter() {
         if tcx.sess.check_name(attr, sym::cold) {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::COLD;
@@ -2726,15 +2724,8 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::NAKED;
         } else if tcx.sess.check_name(attr, sym::no_mangle) {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_MANGLE;
-        } else if attr.has_name(sym::feature) {
-            if let Some(list) = attr.meta_item_list() {
-                if list.iter().any(|nested_meta_item| nested_meta_item.has_name(sym::no_coverage)) {
-                    tcx.sess.mark_attr_used(attr);
-                    no_coverage_feature_enabled = true;
-                }
-            }
         } else if tcx.sess.check_name(attr, sym::no_coverage) {
-            no_coverage_attr = Some(attr);
+            codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_COVERAGE;
         } else if tcx.sess.check_name(attr, sym::rustc_std_internal_symbol) {
             codegen_fn_attrs.flags |= CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL;
         } else if tcx.sess.check_name(attr, sym::used) {
@@ -2945,23 +2936,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
         }
     }
 
-    if let Some(no_coverage_attr) = no_coverage_attr {
-        if tcx.sess.features_untracked().no_coverage || no_coverage_feature_enabled {
-            codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_COVERAGE
-        } else {
-            let mut err = feature_err(
-                &tcx.sess.parse_sess,
-                sym::no_coverage,
-                no_coverage_attr.span,
-                "the `#[no_coverage]` attribute is an experimental feature",
-            );
-            if tcx.sess.parse_sess.unstable_features.is_nightly_build() {
-                err.help("or, alternatively, add `#[feature(no_coverage)]` to the function");
-            }
-            err.emit();
-        }
-    }
-
     codegen_fn_attrs.inline = attrs.iter().fold(InlineAttr::None, |ia, attr| {
         if !attr.has_name(sym::inline) {
             return ia;

library/core/src/cmp.rs

@@ -274,8 +274,7 @@ pub trait Eq: PartialEq<Self> {
     //
     // This should never be implemented by hand.
     #[doc(hidden)]
-    #[cfg_attr(not(bootstrap), feature(no_coverage))]
-    #[cfg_attr(not(bootstrap), no_coverage)]
+    #[cfg_attr(not(bootstrap), no_coverage)] // rust-lang/rust#84605
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn assert_receiver_is_total_eq(&self) {}
@@ -284,7 +283,7 @@ pub trait Eq: PartialEq<Self> {
 /// Derive macro generating an impl of the trait `Eq`.
 #[rustc_builtin_macro]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
-#[allow_internal_unstable(core_intrinsics, derive_eq, structural_match)]
+#[allow_internal_unstable(core_intrinsics, derive_eq, structural_match, no_coverage)]
 pub macro Eq($item:item) {
     /* compiler built-in */
 }