[beta] backports

compiler/rustc_attr_parsing/src/attributes/link_attrs.rs

@@ -466,8 +466,14 @@ impl<S: Stage> SingleAttributeParser<S> for LinkSectionParser {
     const PATH: &[Symbol] = &[sym::link_section];
     const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepInnermost;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError;
-    const ALLOWED_TARGETS: AllowedTargets =
-        AllowedTargets::AllowListWarnRest(&[Allow(Target::Static), Allow(Target::Fn)]);
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowListWarnRest(&[
+        Allow(Target::Static),
+        Allow(Target::Fn),
+        Allow(Target::Method(MethodKind::Inherent)),
+        Allow(Target::Method(MethodKind::Trait { body: false })),
+        Allow(Target::Method(MethodKind::Trait { body: true })),
+        Allow(Target::Method(MethodKind::TraitImpl)),
+    ]);
     const TEMPLATE: AttributeTemplate = template!(
         NameValueStr: "name",
         "https://doc.rust-lang.org/reference/abi.html#the-link_section-attribute"

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

@@ -423,19 +423,24 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 constituents.types,
             );
 
-            // FIXME(coroutine_clone): We could uplift this into `collect_predicates_for_types`
-            // and do this for `Copy`/`Clone` too, but that's feature-gated so it doesn't really
-            // matter yet.
-            for assumption in constituents.assumptions {
-                let assumption = normalize_with_depth_to(
-                    self,
-                    obligation.param_env,
-                    cause.clone(),
-                    obligation.recursion_depth + 1,
-                    assumption,
-                    &mut obligations,
-                );
-                self.infcx.register_region_assumption(assumption);
+            // Only normalize these goals if `-Zhigher-ranked-assumptions` is enabled, since
+            // we don't want to cause ourselves to do extra work if we're not even able to
+            // take advantage of these assumption clauses.
+            if self.tcx().sess.opts.unstable_opts.higher_ranked_assumptions {
+                // FIXME(coroutine_clone): We could uplift this into `collect_predicates_for_types`
+                // and do this for `Copy`/`Clone` too, but that's feature-gated so it doesn't really
+                // matter yet.
+                for assumption in constituents.assumptions {
+                    let assumption = normalize_with_depth_to(
+                        self,
+                        obligation.param_env,
+                        cause.clone(),
+                        obligation.recursion_depth + 1,
+                        assumption,
+                        &mut obligations,
+                    );
+                    self.infcx.register_region_assumption(assumption);
+                }
             }
 
             Ok(obligations)

src/bootstrap/src/core/build_steps/compile.rs

@@ -519,7 +519,7 @@ pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, cargo: &mut Car
         // Query rustc for the deployment target, and the associated env var.
         // The env var is one of the standard `*_DEPLOYMENT_TARGET` vars, i.e.
         // `MACOSX_DEPLOYMENT_TARGET`, `IPHONEOS_DEPLOYMENT_TARGET`, etc.
-        let mut cmd = command(builder.rustc(cargo.compiler()));
+        let mut cmd = builder.rustc_cmd(cargo.compiler());
         cmd.arg("--target").arg(target.rustc_target_arg());
         cmd.arg("--print=deployment-target");
         let output = cmd.run_capture_stdout(builder).stdout();

src/bootstrap/src/core/build_steps/dist.rs

@@ -625,7 +625,7 @@ fn generate_target_spec_json_schema(builder: &Builder<'_>, sysroot: &Path) {
     // We do this by using the stage 1 compiler, which is always compiled for the host,
     // even in a cross build.
     let stage1_host = builder.compiler(1, builder.host_target);
-    let mut rustc = command(builder.rustc(stage1_host)).fail_fast();
+    let mut rustc = builder.rustc_cmd(stage1_host).fail_fast();
     rustc
         .env("RUSTC_BOOTSTRAP", "1")
         .args(["--print=target-spec-json-schema", "-Zunstable-options"]);

src/bootstrap/src/core/build_steps/synthetic_targets.rs

@@ -10,7 +10,6 @@
 use crate::Compiler;
 use crate::core::builder::{Builder, ShouldRun, Step};
 use crate::core::config::TargetSelection;
-use crate::utils::exec::command;
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub(crate) struct MirOptPanicAbortSyntheticTarget {
@@ -55,7 +54,7 @@ fn create_synthetic_target(
         return TargetSelection::create_synthetic(&name, path.to_str().unwrap());
     }
 
-    let mut cmd = command(builder.rustc(compiler));
+    let mut cmd = builder.rustc_cmd(compiler);
     cmd.arg("--target").arg(base.rustc_target_arg());
     cmd.args(["-Zunstable-options", "--print", "target-spec-json"]);
 

src/bootstrap/src/core/build_steps/test.rs

@@ -3263,6 +3263,8 @@ fn distcheck_plain_source_tarball(builder: &Builder<'_>, plain_src_dir: &Path) {
         .env("GITHUB_ACTIONS", "0")
         .current_dir(plain_src_dir)
         .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    builder.remove_dir(plain_src_dir);
 }
 
 /// Check that rust-src has all of libstd's dependencies
@@ -3288,6 +3290,8 @@ fn distcheck_rust_src(builder: &Builder<'_>, src_dir: &Path) {
         .arg(&toml)
         .current_dir(src_dir)
         .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    builder.remove_dir(src_dir);
 }
 
 /// Check that rustc-dev's compiler crate source code can be loaded with `cargo metadata`
@@ -3312,6 +3316,8 @@ fn distcheck_rustc_dev(builder: &Builder<'_>, dir: &Path) {
         .env("RUSTC", &builder.initial_rustc)
         .current_dir(dir)
         .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    builder.remove_dir(dir);
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]

src/bootstrap/src/core/builder/cargo.rs

@@ -722,10 +722,8 @@ impl Builder<'_> {
                 // Build proc macros both for the host and the target unless proc-macros are not
                 // supported by the target.
                 if target != compiler.host && cmd_kind != Kind::Check {
-                    let mut rustc_cmd = command(self.rustc(compiler));
-                    self.add_rustc_lib_path(compiler, &mut rustc_cmd);
-
-                    let error = rustc_cmd
+                    let error = self
+                        .rustc_cmd(compiler)
                         .arg("--target")
                         .arg(target.rustc_target_arg())
                         .arg("--print=file-names")

src/bootstrap/src/core/builder/mod.rs

@@ -1591,6 +1591,14 @@ Alternatively, you can set `build.local-rebuild=true` and use a stage0 compiler
         }
     }
 
+    /// Gets a command to run the compiler specified, including the dynamic library
+    /// path in case the executable has not been build with `rpath` enabled.
+    pub fn rustc_cmd(&self, compiler: Compiler) -> BootstrapCommand {
+        let mut cmd = command(self.rustc(compiler));
+        self.add_rustc_lib_path(compiler, &mut cmd);
+        cmd
+    }
+
     /// Gets the paths to all of the compiler's codegen backends.
     fn codegen_backends(&self, compiler: Compiler) -> impl Iterator<Item = PathBuf> {
         fs::read_dir(self.sysroot_codegen_backends(compiler))

tests/ui/async-await/higher-ranked-normalize-assumptions-2.rs

@@ -0,0 +1,38 @@
+//@ revisions: stock hr
+//@[hr] compile-flags: -Zhigher-ranked-assumptions
+//@ edition: 2024
+//@ check-pass
+
+// Test that we don't normalize the higher-ranked assumptions of an auto trait goal
+// unless we have `-Zhigher-ranked-assumptions`, since obligations that result from
+// this normalization may lead to higher-ranked lifetime errors when the flag is not
+// enabled.
+
+// Regression test for <https://github.com/rust-lang/rust/issues/147244>.
+
+pub fn a() -> impl Future + Send {
+    async {
+        let queries = core::iter::empty().map(Thing::f);
+        b(queries).await;
+    }
+}
+
+async fn b(queries: impl IntoIterator) {
+    c(queries).await;
+}
+
+fn c<'a, I>(_queries: I) -> impl Future
+where
+    I: IntoIterator,
+    I::IntoIter: 'a,
+{
+    async {}
+}
+
+pub struct Thing<'a>(pub &'a ());
+
+impl Thing<'_> {
+    fn f(_: &Self) {}
+}
+
+fn main() {}

tests/ui/async-await/higher-ranked-normalize-assumptions.rs

@@ -0,0 +1,51 @@
+//@ revisions: stock hr
+//@[hr] compile-flags: -Zhigher-ranked-assumptions
+//@ edition: 2024
+//@ check-pass
+
+// Test that we don't normalize the higher-ranked assumptions of an auto trait goal
+// unless we have `-Zhigher-ranked-assumptions`, since obligations that result from
+// this normalization may lead to higher-ranked lifetime errors when the flag is not
+// enabled.
+
+// Regression test for <https://github.com/rust-lang/rust/issues/147285>.
+
+pub trait Service {
+    type Response;
+}
+
+impl<T, R> Service for T
+where
+    T: FnMut() -> R,
+    R: 'static,
+{
+    type Response = R;
+}
+
+async fn serve<C>(_: C)
+where
+    C: Service,
+    C::Response: 'static,
+{
+    connect::<C>().await;
+}
+
+async fn connect<C>()
+where
+    C: Service,
+    C::Response: 'static,
+{
+}
+
+fn repro() -> impl Send {
+    async {
+        let server = || do_something();
+        serve(server).await;
+    }
+}
+
+fn do_something() -> Box<dyn std::error::Error> {
+    unimplemented!()
+}
+
+fn main() {}

tests/ui/attributes/attr-on-mac-call.stderr

@@ -82,7 +82,7 @@ LL |     #[link_section = "x"]
    |     ^^^^^^^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = help: `#[link_section]` can be applied to statics and functions
+   = help: `#[link_section]` can be applied to functions and statics
 
 warning: `#[link_ordinal]` attribute cannot be used on macro calls
   --> $DIR/attr-on-mac-call.rs:33:5

tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs.rs

@@ -687,6 +687,32 @@ mod link_section {
     //~| WARN previously accepted
     //~| HELP can be applied to
     //~| HELP remove the attribute
+
+    #[link_section = "1800"]
+    //~^ WARN attribute cannot be used on
+    //~| WARN previously accepted
+    //~| HELP can be applied to
+    //~| HELP remove the attribute
+    trait Tr {
+        #[link_section = "1800"]
+        fn inside_tr_no_default(&self);
+
+        #[link_section = "1800"]
+        fn inside_tr_default(&self) { }
+    }
+
+    impl S {
+        #[link_section = "1800"]
+        fn inside_abc_123(&self) { }
+    }
+
+    impl Tr for S {
+        #[link_section = "1800"]
+        fn inside_tr_no_default(&self) { }
+    }
+
+    #[link_section = "1800"]
+    fn should_always_link() { }
 }