Auto merge of #70053 - Centril:rollup-lumng3d, r=Centril

Rollup of 7 pull requests

Successful merges:

 - #69870 (expand: Implement something similar to `#[cfg(accessible(path))]`)
 - #69881 (VariantSizeDifferences: bail on SizeOverflow)
 - #70000 (resolve: Fix regression in resolution of raw keywords in paths)
 - #70029 (Bump the bootstrap compiler)
 - #70046 (Use sublice patterns to avoid computing the len)
 - #70049 (Fiddle `ParamEnv` through to a place that used to use `ParamEnv::empty` in a buggy manner)
 - #70051 (Allow `hir().find` to return `None`)

Failed merges:

r? @ghost

Author: bors

Diff for: src/bootstrap/builder.rs

@@ -725,7 +725,7 @@ impl<'a> Builder<'a> {
             self.clear_if_dirty(&my_out, &rustdoc);
         }
 
-        cargo.env("CARGO_TARGET_DIR", &out_dir).arg(cmd).arg("-Zconfig-profile");
+        cargo.env("CARGO_TARGET_DIR", &out_dir).arg(cmd);
 
         let profile_var = |name: &str| {
             let profile = if self.config.rust_optimize { "RELEASE" } else { "DEV" };
@@ -847,13 +847,7 @@ impl<'a> Builder<'a> {
             rustflags.arg("-Zforce-unstable-if-unmarked");
         }
 
-        // cfg(bootstrap): the flag was renamed from `-Zexternal-macro-backtrace`
-        // to `-Zmacro-backtrace`, keep only the latter after beta promotion.
-        if stage == 0 {
-            rustflags.arg("-Zexternal-macro-backtrace");
-        } else {
-            rustflags.arg("-Zmacro-backtrace");
-        }
+        rustflags.arg("-Zmacro-backtrace");
 
         let want_rustdoc = self.doc_tests != DocTests::No;
 

Diff for: src/bootstrap/channel.rs

@@ -13,7 +13,7 @@ use build_helper::output;
 use crate::Build;
 
 // The version number
-pub const CFG_RELEASE_NUM: &str = "1.43.0";
+pub const CFG_RELEASE_NUM: &str = "1.44.0";
 
 pub struct GitInfo {
     inner: Option<Info>,

Diff for: src/liballoc/boxed.rs

@@ -1105,29 +1105,6 @@ impl<T: ?Sized> AsMut<T> for Box<T> {
 #[stable(feature = "pin", since = "1.33.0")]
 impl<T: ?Sized> Unpin for Box<T> {}
 
-#[cfg(bootstrap)]
-#[unstable(feature = "generator_trait", issue = "43122")]
-impl<G: ?Sized + Generator + Unpin> Generator for Box<G> {
-    type Yield = G::Yield;
-    type Return = G::Return;
-
-    fn resume(mut self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> {
-        G::resume(Pin::new(&mut *self))
-    }
-}
-
-#[cfg(bootstrap)]
-#[unstable(feature = "generator_trait", issue = "43122")]
-impl<G: ?Sized + Generator> Generator for Pin<Box<G>> {
-    type Yield = G::Yield;
-    type Return = G::Return;
-
-    fn resume(mut self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> {
-        G::resume((*self).as_mut())
-    }
-}
-
-#[cfg(not(bootstrap))]
 #[unstable(feature = "generator_trait", issue = "43122")]
 impl<G: ?Sized + Generator<R> + Unpin, R> Generator<R> for Box<G> {
     type Yield = G::Yield;
@@ -1138,7 +1115,6 @@ impl<G: ?Sized + Generator<R> + Unpin, R> Generator<R> for Box<G> {
     }
 }
 
-#[cfg(not(bootstrap))]
 #[unstable(feature = "generator_trait", issue = "43122")]
 impl<G: ?Sized + Generator<R>, R> Generator<R> for Pin<Box<G>> {
     type Yield = G::Yield;

Diff for: src/libcore/cell.rs

@@ -1569,7 +1569,7 @@ impl<T: ?Sized + fmt::Display> fmt::Display for RefMut<'_, T> {
 #[lang = "unsafe_cell"]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[repr(transparent)]
-#[cfg_attr(not(bootstrap), repr(no_niche))] // rust-lang/rust#68303.
+#[repr(no_niche)] // rust-lang/rust#68303.
 pub struct UnsafeCell<T: ?Sized> {
     value: T,
 }

Diff for: src/libcore/lib.rs

@@ -140,7 +140,7 @@
 #![feature(associated_type_bounds)]
 #![feature(const_type_id)]
 #![feature(const_caller_location)]
-#![cfg_attr(not(bootstrap), feature(no_niche))] // rust-lang/rust#68303
+#![feature(no_niche)] // rust-lang/rust#68303
 
 #[prelude_import]
 #[allow(unused)]

Diff for: src/libcore/macros/mod.rs

@@ -1404,6 +1404,18 @@ pub(crate) mod builtin {
         /* compiler built-in */
     }
 
+    /// Keeps the item it's applied to if the passed path is accessible, and removes it otherwise.
+    #[cfg(not(bootstrap))]
+    #[unstable(
+        feature = "cfg_accessible",
+        issue = "64797",
+        reason = "`cfg_accessible` is not fully implemented"
+    )]
+    #[rustc_builtin_macro]
+    pub macro cfg_accessible($item:item) {
+        /* compiler built-in */
+    }
+
     /// Unstable implementation detail of the `rustc` compiler, do not use.
     #[rustc_builtin_macro]
     #[stable(feature = "rust1", since = "1.0.0")]

Diff for: src/libcore/ops/generator.rs

@@ -67,7 +67,7 @@ pub enum GeneratorState<Y, R> {
 #[lang = "generator"]
 #[unstable(feature = "generator_trait", issue = "43122")]
 #[fundamental]
-pub trait Generator<#[cfg(not(bootstrap))] R = ()> {
+pub trait Generator<R = ()> {
     /// The type of value this generator yields.
     ///
     /// This associated type corresponds to the `yield` expression and the
@@ -110,35 +110,9 @@ pub trait Generator<#[cfg(not(bootstrap))] R = ()> {
     /// been returned previously. While generator literals in the language are
     /// guaranteed to panic on resuming after `Complete`, this is not guaranteed
     /// for all implementations of the `Generator` trait.
-    fn resume(
-        self: Pin<&mut Self>,
-        #[cfg(not(bootstrap))] arg: R,
-    ) -> GeneratorState<Self::Yield, Self::Return>;
+    fn resume(self: Pin<&mut Self>, arg: R) -> GeneratorState<Self::Yield, Self::Return>;
 }
 
-#[cfg(bootstrap)]
-#[unstable(feature = "generator_trait", issue = "43122")]
-impl<G: ?Sized + Generator> Generator for Pin<&mut G> {
-    type Yield = G::Yield;
-    type Return = G::Return;
-
-    fn resume(mut self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> {
-        G::resume((*self).as_mut())
-    }
-}
-
-#[cfg(bootstrap)]
-#[unstable(feature = "generator_trait", issue = "43122")]
-impl<G: ?Sized + Generator + Unpin> Generator for &mut G {
-    type Yield = G::Yield;
-    type Return = G::Return;
-
-    fn resume(mut self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> {
-        G::resume(Pin::new(&mut *self))
-    }
-}
-
-#[cfg(not(bootstrap))]
 #[unstable(feature = "generator_trait", issue = "43122")]
 impl<G: ?Sized + Generator<R>, R> Generator<R> for Pin<&mut G> {
     type Yield = G::Yield;
@@ -149,7 +123,6 @@ impl<G: ?Sized + Generator<R>, R> Generator<R> for Pin<&mut G> {
     }
 }
 
-#[cfg(not(bootstrap))]
 #[unstable(feature = "generator_trait", issue = "43122")]
 impl<G: ?Sized + Generator<R> + Unpin, R> Generator<R> for &mut G {
     type Yield = G::Yield;

Diff for: src/libcore/prelude/v1.rs

@@ -67,3 +67,12 @@ pub use crate::{
 pub use crate::macros::builtin::{
     bench, global_allocator, test, test_case, RustcDecodable, RustcEncodable,
 };
+
+#[cfg(not(bootstrap))]
+#[unstable(
+    feature = "cfg_accessible",
+    issue = "64797",
+    reason = "`cfg_accessible` is not fully implemented"
+)]
+#[doc(no_inline)]
+pub use crate::macros::builtin::cfg_accessible;

Diff for: src/librustc/hir/map/mod.rs

@@ -342,20 +342,25 @@ impl<'hir> Map<'hir> {
     }
 
     fn find_entry(&self, id: HirId) -> Option<Entry<'hir>> {
-        Some(self.get_entry(id))
-    }
-
-    fn get_entry(&self, id: HirId) -> Entry<'hir> {
         if id.local_id == ItemLocalId::from_u32_const(0) {
             let owner = self.tcx.hir_owner(id.owner_def_id());
-            Entry { parent: owner.parent, node: owner.node }
+            owner.map(|owner| Entry { parent: owner.parent, node: owner.node })
         } else {
             let owner = self.tcx.hir_owner_items(id.owner_def_id());
-            let item = owner.items[id.local_id].as_ref().unwrap();
-            Entry { parent: HirId { owner: id.owner, local_id: item.parent }, node: item.node }
+            owner.and_then(|owner| {
+                let item = owner.items[id.local_id].as_ref();
+                item.map(|item| Entry {
+                    parent: HirId { owner: id.owner, local_id: item.parent },
+                    node: item.node,
+                })
+            })
         }
     }
 
+    fn get_entry(&self, id: HirId) -> Entry<'hir> {
+        self.find_entry(id).unwrap()
+    }
+
     pub fn item(&self, id: HirId) -> &'hir Item<'hir> {
         match self.find(id).unwrap() {
             Node::Item(item) => item,
@@ -380,6 +385,7 @@ impl<'hir> Map<'hir> {
     pub fn body(&self, id: BodyId) -> &'hir Body<'hir> {
         self.tcx
             .hir_owner_items(DefId::local(id.hir_id.owner))
+            .unwrap()
             .bodies
             .get(&id.hir_id.local_id)
             .unwrap()
@@ -541,8 +547,9 @@ impl<'hir> Map<'hir> {
 
     /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
     pub fn find(&self, hir_id: HirId) -> Option<Node<'hir>> {
-        let node = self.get_entry(hir_id).node;
-        if let Node::Crate(..) = node { None } else { Some(node) }
+        self.find_entry(hir_id).and_then(|entry| {
+            if let Node::Crate(..) = entry.node { None } else { Some(entry.node) }
+        })
     }
 
     /// Similar to `get_parent`; returns the parent HIR Id, or just `hir_id` if there

Diff for: src/librustc/hir/mod.rs

@@ -78,9 +78,8 @@ pub fn provide(providers: &mut Providers<'_>) {
         let module = hir.as_local_hir_id(id).unwrap();
         &tcx.untracked_crate.modules[&module]
     };
-    providers.hir_owner = |tcx, id| tcx.index_hir(id.krate).map[id.index].signature.unwrap();
-    providers.hir_owner_items = |tcx, id| {
-        tcx.index_hir(id.krate).map[id.index].with_bodies.as_ref().map(|items| &**items).unwrap()
-    };
+    providers.hir_owner = |tcx, id| tcx.index_hir(id.krate).map[id.index].signature;
+    providers.hir_owner_items =
+        |tcx, id| tcx.index_hir(id.krate).map[id.index].with_bodies.as_ref().map(|items| &**items);
     map::provide(providers);
 }

Diff for: src/librustc/query/mod.rs

@@ -74,15 +74,15 @@ rustc_queries! {
         // a `DefId`.
         // This can be conveniently accessed by methods on `tcx.hir()`.
         // Avoid calling this query directly.
-        query hir_owner(key: DefId) -> &'tcx HirOwner<'tcx> {
+        query hir_owner(key: DefId) -> Option<&'tcx HirOwner<'tcx>> {
             eval_always
         }
 
         // The HIR items which do not themselves have a `DefId` and are owned by another HIR item
         // with a `DefId`.
         // This can be conveniently accessed by methods on `tcx.hir()`.
         // Avoid calling this query directly.
-        query hir_owner_items(key: DefId) -> &'tcx HirOwnerItems<'tcx> {
+        query hir_owner_items(key: DefId) -> Option<&'tcx HirOwnerItems<'tcx>> {
             eval_always
         }
 

Diff for: src/librustc/ty/inhabitedness/mod.rs

@@ -90,30 +90,46 @@ impl<'tcx> TyCtxt<'tcx> {
     /// ```
     /// This code should only compile in modules where the uninhabitedness of Foo is
     /// visible.
-    pub fn is_ty_uninhabited_from(self, module: DefId, ty: Ty<'tcx>) -> bool {
+    pub fn is_ty_uninhabited_from(
+        self,
+        module: DefId,
+        ty: Ty<'tcx>,
+        param_env: ty::ParamEnv<'tcx>,
+    ) -> bool {
         // To check whether this type is uninhabited at all (not just from the
         // given node), you could check whether the forest is empty.
         // ```
         // forest.is_empty()
         // ```
-        ty.uninhabited_from(self).contains(self, module)
+        ty.uninhabited_from(self, param_env).contains(self, module)
     }
 
-    pub fn is_ty_uninhabited_from_any_module(self, ty: Ty<'tcx>) -> bool {
-        !ty.uninhabited_from(self).is_empty()
+    pub fn is_ty_uninhabited_from_any_module(
+        self,
+        ty: Ty<'tcx>,
+        param_env: ty::ParamEnv<'tcx>,
+    ) -> bool {
+        !ty.uninhabited_from(self, param_env).is_empty()
     }
 }
 
 impl<'tcx> AdtDef {
     /// Calculates the forest of `DefId`s from which this ADT is visibly uninhabited.
-    fn uninhabited_from(&self, tcx: TyCtxt<'tcx>, substs: SubstsRef<'tcx>) -> DefIdForest {
+    fn uninhabited_from(
+        &self,
+        tcx: TyCtxt<'tcx>,
+        substs: SubstsRef<'tcx>,
+        param_env: ty::ParamEnv<'tcx>,
+    ) -> DefIdForest {
         // Non-exhaustive ADTs from other crates are always considered inhabited.
         if self.is_variant_list_non_exhaustive() && !self.did.is_local() {
             DefIdForest::empty()
         } else {
             DefIdForest::intersection(
                 tcx,
-                self.variants.iter().map(|v| v.uninhabited_from(tcx, substs, self.adt_kind())),
+                self.variants
+                    .iter()
+                    .map(|v| v.uninhabited_from(tcx, substs, self.adt_kind(), param_env)),
             )
         }
     }
@@ -126,6 +142,7 @@ impl<'tcx> VariantDef {
         tcx: TyCtxt<'tcx>,
         substs: SubstsRef<'tcx>,
         adt_kind: AdtKind,
+        param_env: ty::ParamEnv<'tcx>,
     ) -> DefIdForest {
         let is_enum = match adt_kind {
             // For now, `union`s are never considered uninhabited.
@@ -140,7 +157,7 @@ impl<'tcx> VariantDef {
         } else {
             DefIdForest::union(
                 tcx,
-                self.fields.iter().map(|f| f.uninhabited_from(tcx, substs, is_enum)),
+                self.fields.iter().map(|f| f.uninhabited_from(tcx, substs, is_enum, param_env)),
             )
         }
     }
@@ -153,8 +170,9 @@ impl<'tcx> FieldDef {
         tcx: TyCtxt<'tcx>,
         substs: SubstsRef<'tcx>,
         is_enum: bool,
+        param_env: ty::ParamEnv<'tcx>,
     ) -> DefIdForest {
-        let data_uninhabitedness = move || self.ty(tcx, substs).uninhabited_from(tcx);
+        let data_uninhabitedness = move || self.ty(tcx, substs).uninhabited_from(tcx, param_env);
         // FIXME(canndrew): Currently enum fields are (incorrectly) stored with
         // `Visibility::Invisible` so we need to override `self.vis` if we're
         // dealing with an enum.
@@ -176,20 +194,21 @@ impl<'tcx> FieldDef {
 
 impl<'tcx> TyS<'tcx> {
     /// Calculates the forest of `DefId`s from which this type is visibly uninhabited.
-    fn uninhabited_from(&self, tcx: TyCtxt<'tcx>) -> DefIdForest {
+    fn uninhabited_from(&self, tcx: TyCtxt<'tcx>, param_env: ty::ParamEnv<'tcx>) -> DefIdForest {
         match self.kind {
-            Adt(def, substs) => def.uninhabited_from(tcx, substs),
+            Adt(def, substs) => def.uninhabited_from(tcx, substs, param_env),
 
             Never => DefIdForest::full(tcx),
 
-            Tuple(ref tys) => {
-                DefIdForest::union(tcx, tys.iter().map(|ty| ty.expect_ty().uninhabited_from(tcx)))
-            }
+            Tuple(ref tys) => DefIdForest::union(
+                tcx,
+                tys.iter().map(|ty| ty.expect_ty().uninhabited_from(tcx, param_env)),
+            ),
 
-            Array(ty, len) => match len.try_eval_usize(tcx, ty::ParamEnv::empty()) {
+            Array(ty, len) => match len.try_eval_usize(tcx, param_env) {
                 // If the array is definitely non-empty, it's uninhabited if
                 // the type of its elements is uninhabited.
-                Some(n) if n != 0 => ty.uninhabited_from(tcx),
+                Some(n) if n != 0 => ty.uninhabited_from(tcx, param_env),
                 _ => DefIdForest::empty(),
             },