Auto merge of #72120 - Dylan-DPC:rollup-ca0tur2, r=Dylan-DPC

Rollup of 10 pull requests

Successful merges:

 - #72014 (Deprecated emoji)
 - #72019 (Fix debug assertion in error code)
 - #72027 (Use CDN for ci-caches on download)
 - #72044 (use min_specialization for some rustc crates where it requires no changes)
 - #72052 (display `ConstKind::Param`)
 - #72067 (Emit a warning when optimization fuel runs out)
 - #72072 (doc: minus (U+2212) instead of dash (U+002D) for negative infinity)
 - #72077 (Improve E0571 wording)
 - #72107 (Clean up E0579 explanation)
 - #72109 (Fix clippy warnings)

Failed merges:

r? @ghost

.github/workflows/ci.yml

@@ -34,6 +34,7 @@ jobs:
       CI_JOB_NAME: "${{ matrix.name }}"
       SCCACHE_BUCKET: rust-lang-gha-caches
       TOOLSTATE_REPO: "https://github.com/pietroalbini/rust-toolstate"
+      CACHE_DOMAIN: ci-caches-gha.rust-lang.org
     if: "github.event_name == 'pull_request'"
     strategy:
       matrix:
@@ -146,6 +147,7 @@ jobs:
       TOOLSTATE_PUBLISH: 1
       CACHES_AWS_ACCESS_KEY_ID: AKIA46X5W6CZOMUQATD5
       ARTIFACTS_AWS_ACCESS_KEY_ID: AKIA46X5W6CZH5AYXDVF
+      CACHE_DOMAIN: ci-caches-gha.rust-lang.org
     if: "github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
     strategy:
       matrix:
@@ -255,6 +257,7 @@ jobs:
       TOOLSTATE_PUBLISH: 1
       CACHES_AWS_ACCESS_KEY_ID: AKIA46X5W6CZOMUQATD5
       ARTIFACTS_AWS_ACCESS_KEY_ID: AKIA46X5W6CZH5AYXDVF
+      CACHE_DOMAIN: ci-caches-gha.rust-lang.org
     if: "github.event_name == 'push' && github.ref == 'refs/heads/auto' && github.repository == 'rust-lang-ci/rust'"
     strategy:
       matrix:
@@ -606,6 +609,7 @@ jobs:
       TOOLSTATE_PUBLISH: 1
       CACHES_AWS_ACCESS_KEY_ID: AKIA46X5W6CZOMUQATD5
       ARTIFACTS_AWS_ACCESS_KEY_ID: AKIA46X5W6CZH5AYXDVF
+      CACHE_DOMAIN: ci-caches-gha.rust-lang.org
     if: "github.event_name == 'push' && github.ref == 'refs/heads/master' && github.repository == 'rust-lang-ci/rust'"
     steps:
       - name: checkout the source code

src/ci/docker/run.sh

@@ -17,6 +17,8 @@ dist=$objdir/build/dist
 
 source "$ci_dir/shared.sh"
 
+CACHE_DOMAIN="${CACHE_DOMAIN:-ci-caches.rust-lang.org}"
+
 if [ -f "$docker_dir/$image/Dockerfile" ]; then
     if [ "$CI" != "" ]; then
       hash_key=/tmp/.docker-hash-key.txt
@@ -38,9 +40,7 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
       cksum=$(sha512sum $hash_key | \
         awk '{print $1}')
 
-      s3url="s3://$SCCACHE_BUCKET/docker/$cksum"
-      url="https://$SCCACHE_BUCKET.s3.amazonaws.com/docker/$cksum"
-      upload="aws s3 cp - $s3url"
+      url="https://$CACHE_DOMAIN/docker/$cksum"
 
       echo "Attempting to download $url"
       rm -f /tmp/rustci_docker_cache
@@ -65,7 +65,9 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
       -f "$dockerfile" \
       "$context"
 
-    if [ "$upload" != "" ]; then
+    if [ "$CI" != "" ]; then
+      s3url="s3://$SCCACHE_BUCKET/docker/$cksum"
+      upload="aws s3 cp - $s3url"
       digest=$(docker inspect rust-ci --format '{{.Id}}')
       echo "Built container $digest"
       if ! grep -q "$digest" <(echo "$loaded_images"); then

src/ci/github-actions/ci.yml

@@ -37,6 +37,7 @@ x--expand-yaml-anchors--remove:
   - &public-variables
     SCCACHE_BUCKET: rust-lang-gha-caches
     TOOLSTATE_REPO: https://github.com/pietroalbini/rust-toolstate
+    CACHE_DOMAIN: ci-caches-gha.rust-lang.org
 
   - &prod-variables
     SCCACHE_BUCKET: rust-lang-gha-caches
@@ -51,6 +52,7 @@ x--expand-yaml-anchors--remove:
     # (caches, artifacts...).
     CACHES_AWS_ACCESS_KEY_ID: AKIA46X5W6CZOMUQATD5
     ARTIFACTS_AWS_ACCESS_KEY_ID: AKIA46X5W6CZH5AYXDVF
+    CACHE_DOMAIN: ci-caches-gha.rust-lang.org
 
   - &base-job
     env: {}

src/libcore/num/f32.rs

@@ -367,7 +367,7 @@ impl f32 {
     /// Infinity (∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const INFINITY: f32 = 1.0_f32 / 0.0_f32;
-    /// Negative infinity (-∞).
+    /// Negative infinity (−∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const NEG_INFINITY: f32 = -1.0_f32 / 0.0_f32;
 

src/libcore/num/f64.rs

@@ -366,7 +366,7 @@ impl f64 {
     /// Infinity (∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const INFINITY: f64 = 1.0_f64 / 0.0_f64;
-    /// Negative infinity (-∞).
+    /// Negative infinity (−∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const NEG_INFINITY: f64 = -1.0_f64 / 0.0_f64;
 

src/librustc_ast_lowering/lib.rs

@@ -33,7 +33,7 @@
 #![feature(array_value_iter)]
 #![feature(crate_visibility_modifier)]
 #![feature(marker_trait_attr)]
-#![feature(specialization)]
+#![feature(specialization)] // FIXME: min_specialization does not work
 #![feature(or_patterns)]
 #![recursion_limit = "256"]
 

src/librustc_attr/builtin.rs

@@ -634,7 +634,7 @@ pub fn eval_condition(
                 [NestedMetaItem::Literal(Lit { span, .. })
                 | NestedMetaItem::MetaItem(MetaItem { span, .. })] => {
                     sess.span_diagnostic
-                        .struct_span_err(*span, &*format!("expected a version literal"))
+                        .struct_span_err(*span, "expected a version literal")
                         .emit();
                     return false;
                 }

src/librustc_data_structures/lib.rs

@@ -12,7 +12,7 @@
 #![feature(generators)]
 #![feature(generator_trait)]
 #![feature(fn_traits)]
-#![feature(specialization)]
+#![feature(min_specialization)]
 #![feature(optin_builtin_traits)]
 #![feature(nll)]
 #![feature(allow_internal_unstable)]

src/librustc_data_structures/tiny_list.rs

@@ -52,7 +52,7 @@ impl<T: PartialEq> TinyList<T> {
             if &e.data == data {
                 return true;
             }
-            elem = e.next.as_ref().map(|e| &**e);
+            elem = e.next.as_deref();
         }
         false
     }
@@ -62,7 +62,7 @@ impl<T: PartialEq> TinyList<T> {
         let (mut elem, mut count) = (self.head.as_ref(), 0);
         while let Some(ref e) = elem {
             count += 1;
-            elem = e.next.as_ref().map(|e| &**e);
+            elem = e.next.as_deref();
         }
         count
     }

src/librustc_error_codes/error_codes/E0571.md

@@ -7,7 +7,7 @@ Example of erroneous code:
 # fn satisfied(n: usize) -> bool { n % 23 == 0 }
 let result = while true {
     if satisfied(i) {
-        break 2*i; // error: `break` with value from a `while` loop
+        break 2 * i; // error: `break` with value from a `while` loop
     }
     i += 1;
 };
@@ -22,9 +22,9 @@ Make sure `break value;` statements only occur in `loop` loops:
 ```
 # let mut i = 1;
 # fn satisfied(n: usize) -> bool { n % 23 == 0 }
-let result = loop { // ok!
+let result = loop { // This is now a "loop" loop.
     if satisfied(i) {
-        break 2*i;
+        break 2 * i; // ok!
     }
     i += 1;
 };

src/librustc_error_codes/error_codes/E0579.md

@@ -1,7 +1,4 @@
-When matching against an exclusive range, the compiler verifies that the range
-is non-empty. Exclusive range patterns include the start point but not the end
-point, so this is equivalent to requiring the start of the range to be less
-than the end of the range.
+A lower range wasn't less than the upper range.
 
 Erroneous code example:
 
@@ -17,3 +14,8 @@ fn main() {
     }
 }
 ```
+
+When matching against an exclusive range, the compiler verifies that the range
+is non-empty. Exclusive range patterns include the start point but not the end
+point, so this is equivalent to requiring the start of the range to be less
+than the end of the range.

src/librustc_hir/lib.rs

@@ -8,7 +8,7 @@
 #![feature(const_panic)]
 #![feature(in_band_lifetimes)]
 #![feature(or_patterns)]
-#![feature(specialization)]
+#![feature(min_specialization)]
 #![recursion_limit = "256"]
 
 #[macro_use]

src/librustc_infer/traits/util.rs

@@ -112,8 +112,7 @@ pub fn elaborate_predicates<'tcx>(
     tcx: TyCtxt<'tcx>,
     predicates: impl Iterator<Item = ty::Predicate<'tcx>>,
 ) -> Elaborator<'tcx> {
-    let obligations =
-        predicates.into_iter().map(|predicate| predicate_obligation(predicate, None)).collect();
+    let obligations = predicates.map(|predicate| predicate_obligation(predicate, None)).collect();
     elaborate_obligations(tcx, obligations)
 }
 
@@ -149,7 +148,7 @@ impl Elaborator<'tcx> {
                 // Get predicates declared on the trait.
                 let predicates = tcx.super_predicates_of(data.def_id());
 
-                let obligations = predicates.predicates.into_iter().map(|(pred, span)| {
+                let obligations = predicates.predicates.iter().map(|(pred, span)| {
                     predicate_obligation(
                         pred.subst_supertrait(tcx, &data.to_poly_trait_ref()),
                         Some(*span),

src/librustc_interface/queries.rs

@@ -137,7 +137,7 @@ impl<'tcx> Queries<'tcx> {
             let result = passes::register_plugins(
                 self.session(),
                 &*self.codegen_backend().metadata_loader(),
-                self.compiler.register_lints.as_ref().map(|p| &**p).unwrap_or_else(|| empty),
+                self.compiler.register_lints.as_deref().unwrap_or_else(|| empty),
                 krate,
                 &crate_name,
             );

src/librustc_metadata/lib.rs

@@ -7,7 +7,7 @@
 #![feature(nll)]
 #![feature(or_patterns)]
 #![feature(proc_macro_internals)]
-#![feature(specialization)]
+#![feature(specialization)] // FIXME: min_specialization ICEs
 #![feature(stmt_expr_attributes)]
 #![recursion_limit = "256"]
 

src/librustc_middle/dep_graph/mod.rs

@@ -72,9 +72,9 @@ impl rustc_query_system::dep_graph::DepKind for DepKind {
         })
     }
 
-    fn read_deps<OP>(op: OP) -> ()
+    fn read_deps<OP>(op: OP)
     where
-        OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps>>) -> (),
+        OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps>>),
     {
         ty::tls::with_context_opt(|icx| {
             let icx = if let Some(icx) = icx { icx } else { return };

src/librustc_middle/hir/mod.rs

@@ -78,7 +78,6 @@ pub fn provide(providers: &mut Providers<'_>) {
         &tcx.untracked_crate.modules[&module]
     };
     providers.hir_owner = |tcx, id| tcx.index_hir(LOCAL_CRATE).map[id].signature;
-    providers.hir_owner_nodes =
-        |tcx, id| tcx.index_hir(LOCAL_CRATE).map[id].with_bodies.as_ref().map(|nodes| &**nodes);
+    providers.hir_owner_nodes = |tcx, id| tcx.index_hir(LOCAL_CRATE).map[id].with_bodies.as_deref();
     map::provide(providers);
 }

src/librustc_middle/lib.rs

@@ -41,7 +41,7 @@
 #![feature(option_expect_none)]
 #![feature(or_patterns)]
 #![feature(range_is_empty)]
-#![feature(specialization)]
+#![feature(specialization)] // FIXME: min_specialization does not work
 #![feature(track_caller)]
 #![feature(trusted_len)]
 #![feature(vec_remove_item)]

src/librustc_middle/ty/mod.rs

@@ -280,7 +280,7 @@ impl<'tcx> AssociatedItems<'tcx> {
         &self,
         name: Symbol,
     ) -> impl '_ + Iterator<Item = &ty::AssocItem> {
-        self.items.get_by_key(&name).map(|v| *v)
+        self.items.get_by_key(&name).copied()
     }
 
     /// Returns an iterator over all associated items with the given name.

src/librustc_middle/ty/print/pretty.rs

@@ -701,12 +701,14 @@ pub trait PrettyPrinter<'tcx>:
                 if self.tcx().sess.verbose() {
                     p!(write("{:?}", sz));
                 } else if let ty::ConstKind::Unevaluated(..) = sz.val {
-                    // do not try to evaluate unevaluated constants. If we are const evaluating an
+                    // Do not try to evaluate unevaluated constants. If we are const evaluating an
                     // array length anon const, rustc will (with debug assertions) print the
                     // constant's path. Which will end up here again.
                     p!(write("_"));
                 } else if let Some(n) = sz.val.try_to_bits(self.tcx().data_layout.pointer_size) {
                     p!(write("{}", n));
+                } else if let ty::ConstKind::Param(param) = sz.val {
+                    p!(write("{}", param));
                 } else {
                     p!(write("_"));
                 }

src/librustc_middle/ty/trait_def.rs

@@ -171,10 +171,7 @@ impl<'tcx> TyCtxt<'tcx> {
     pub fn all_impls(self, def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
         let TraitImpls { blanket_impls, non_blanket_impls } = self.trait_impls_of(def_id);
 
-        blanket_impls
-            .into_iter()
-            .chain(non_blanket_impls.into_iter().map(|(_, v)| v).flatten())
-            .cloned()
+        blanket_impls.iter().chain(non_blanket_impls.iter().map(|(_, v)| v).flatten()).cloned()
     }
 }
 

src/librustc_mir/lib.rs

@@ -19,7 +19,7 @@ Rust MIR: a lowered representation of Rust.
 #![feature(exhaustive_patterns)]
 #![feature(iter_order_by)]
 #![feature(never_type)]
-#![feature(specialization)]
+#![feature(min_specialization)]
 #![feature(trusted_len)]
 #![feature(try_blocks)]
 #![feature(associated_type_bounds)]

src/librustc_mir_build/hair/pattern/check_match.rs

@@ -246,7 +246,7 @@ impl<'tcx> MatchVisitor<'_, 'tcx> {
             );
         }
 
-        adt_defined_here(&mut cx, &mut err, pattern_ty, &witnesses);
+        adt_defined_here(&cx, &mut err, pattern_ty, &witnesses);
         err.note(&format!("the matched value is of type `{}`", pattern_ty));
         err.emit();
     }

src/librustc_mir_build/hair/pattern/const_to_pat.rs

@@ -121,7 +121,7 @@ impl<'a, 'tcx> ConstToPat<'a, 'tcx> {
                         )
                     }
                     traits::NonStructuralMatchTy::Dynamic => {
-                        format!("trait objects cannot be used in patterns")
+                        "trait objects cannot be used in patterns".to_string()
                     }
                     traits::NonStructuralMatchTy::Param => {
                         bug!("use of constant whose type is a parameter inside a pattern")

src/librustc_passes/liveness.rs

@@ -931,7 +931,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
         if blk.targeted_by_break {
             self.break_ln.insert(blk.hir_id, succ);
         }
-        let succ = self.propagate_through_opt_expr(blk.expr.as_ref().map(|e| &**e), succ);
+        let succ = self.propagate_through_opt_expr(blk.expr.as_deref(), succ);
         blk.stmts.iter().rev().fold(succ, |succ, stmt| self.propagate_through_stmt(stmt, succ))
     }
 
@@ -952,7 +952,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
                 // initialization, which is mildly more complex than checking
                 // once at the func header but otherwise equivalent.
 
-                let succ = self.propagate_through_opt_expr(local.init.as_ref().map(|e| &**e), succ);
+                let succ = self.propagate_through_opt_expr(local.init.as_deref(), succ);
                 self.define_bindings_in_pat(&local.pat, succ)
             }
             hir::StmtKind::Item(..) => succ,

src/librustc_passes/region.rs

@@ -797,7 +797,7 @@ impl<'tcx> Visitor<'tcx> for RegionResolutionVisitor<'tcx> {
         resolve_expr(self, ex);
     }
     fn visit_local(&mut self, l: &'tcx Local<'tcx>) {
-        resolve_local(self, Some(&l.pat), l.init.as_ref().map(|e| &**e));
+        resolve_local(self, Some(&l.pat), l.init.as_deref());
     }
 }
 

src/librustc_query_system/dep_graph/dep_node.rs

@@ -80,7 +80,7 @@ impl<K: DepKind> DepNode<K> {
             }
         }
 
-        return dep_node;
+        dep_node
     }
 }
 

src/librustc_query_system/dep_graph/mod.rs

@@ -77,9 +77,9 @@ pub trait DepKind: Copy + fmt::Debug + Eq + Ord + Hash {
         OP: FnOnce() -> R;
 
     /// Access dependencies from current implicit context.
-    fn read_deps<OP>(op: OP) -> ()
+    fn read_deps<OP>(op: OP)
     where
-        OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps<Self>>>) -> ();
+        OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps<Self>>>);
 
     fn can_reconstruct_query_key(&self) -> bool;
 }

src/librustc_query_system/lib.rs

@@ -4,7 +4,7 @@
 #![feature(const_panic)]
 #![feature(core_intrinsics)]
 #![feature(hash_raw_entry)]
-#![feature(specialization)]
+#![feature(specialization)] // FIXME: min_specialization rejects `default const`
 #![feature(stmt_expr_attributes)]
 #![feature(vec_remove_item)]
 

src/librustc_session/session.rs

@@ -808,7 +808,7 @@ impl Session {
                 let mut fuel = self.optimization_fuel.lock();
                 ret = fuel.remaining != 0;
                 if fuel.remaining == 0 && !fuel.out_of_fuel {
-                    eprintln!("optimization-fuel-exhausted: {}", msg());
+                    self.warn(&format!("optimization-fuel-exhausted: {}", msg()));
                     fuel.out_of_fuel = true;
                 } else if fuel.remaining > 0 {
                     fuel.remaining -= 1;

src/librustc_span/lib.rs

@@ -12,7 +12,7 @@
 #![feature(negative_impls)]
 #![feature(nll)]
 #![feature(optin_builtin_traits)]
-#![feature(specialization)]
+#![feature(min_specialization)]
 
 // FIXME(#56935): Work around ICEs during cross-compilation.
 #[allow(unused)]