rust-lang · Manishearth · Oct 12, 2022 · Oct 12, 2022 · Oct 24, 2022 · Oct 28, 2022
diff --git a/Cargo.lock b/Cargo.lock
@@ -211,7 +211,7 @@ checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
 dependencies = [
  "lazy_static",
  "memchr",
- "regex-automata",
+ "regex-automata 0.1.10",
 ]
 
 [[package]]
@@ -222,7 +222,7 @@ checksum = "fca0852af221f458706eb0725c03e4ed6c46af9ac98e6a689d5e634215d594dd"
 dependencies = [
  "memchr",
  "once_cell",
- "regex-automata",
+ "regex-automata 0.1.10",
  "serde",
 ]
 
@@ -1707,6 +1707,73 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c1ad908cc71012b7bea4d0c53ba96a8cba9962f048fa68d143376143d863b7a"
 
+[[package]]
+name = "icu_list"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c40218275f081c4493f190357c5395647b06734c2dc3dcb41cc099a0f60168b1"
+dependencies = [
+ "displaydoc",
+ "icu_locid",
+ "icu_provider",
+ "regex-automata 0.2.0",
+ "writeable",
+ "zerovec",
+]
+
+[[package]]
+name = "icu_locid"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34b3de5d99a0e275fe6193b9586dbf37364daebc0d39c89b5cf8376a53b789e8"
+dependencies = [
+ "displaydoc",
+ "litemap",
+ "tinystr",
+ "writeable",
+ "zerovec",
+]
+
+[[package]]
+name = "icu_provider"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f911086e3c521a8a824d4f8bfd87769645ced2f07ff913b521c0d793be07100"
+dependencies = [
+ "displaydoc",
+ "icu_locid",
+ "icu_provider_macros",
+ "stable_deref_trait",
+ "writeable",
+ "yoke",
+ "zerofrom",
+ "zerovec",
+]
+
+[[package]]
+name = "icu_provider_adapters"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "980c71d8a91b246ebbb97847178a4b816eea39d1d550c70ee566384555bb6545"
+dependencies = [
+ "icu_locid",
+ "icu_provider",
+ "tinystr",
+ "yoke",
+ "zerovec",
+]
+
+[[package]]
+name = "icu_provider_macros"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38cf6f5b65cf81f0b4298da647101acbfe6ae0e25263f92bd7a22597e9d6d606"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "idna"
 version = "0.2.0"
@@ -2034,6 +2101,12 @@ dependencies = [
  "walkdir",
 ]
 
+[[package]]
+name = "litemap"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f34a3f4798fac63fb48cf277eefa38f94d3443baff555bb98e4f56bc9092368e"
+
 [[package]]
 name = "lld-wrapper"
 version = "0.1.0"
@@ -2100,7 +2173,7 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
 dependencies = [
- "regex-automata",
+ "regex-automata 0.1.10",
 ]
 
 [[package]]
@@ -2927,6 +3000,15 @@ dependencies = [
  "regex-syntax",
 ]
 
+[[package]]
+name = "regex-automata"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9368763f5a9b804326f3af749e16f9abf378d227bcdee7634b13d8f17793782"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "regex-syntax"
 version = "0.6.26"
@@ -3202,6 +3284,18 @@ dependencies = [
  "rustc_span",
 ]
 
+[[package]]
+name = "rustc_baked_icu_data"
+version = "0.0.0"
+dependencies = [
+ "icu_list",
+ "icu_locid",
+ "icu_provider",
+ "icu_provider_adapters",
+ "litemap",
+ "zerovec",
+]
+
 [[package]]
 name = "rustc_borrowck"
 version = "0.0.0"
@@ -3422,13 +3516,18 @@ version = "0.0.0"
 dependencies = [
  "fluent-bundle",
  "fluent-syntax",
+ "icu_list",
+ "icu_locid",
+ "icu_provider_adapters",
  "intl-memoizer",
+ "rustc_baked_icu_data",
  "rustc_data_structures",
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
  "tracing",
  "unic-langid",
+ "writeable",
 ]
 
 [[package]]
@@ -4934,6 +5033,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8aeafdfd935e4a7fe16a91ab711fa52d54df84f9c8f7ca5837a9d1d902ef4c2"
 dependencies = [
  "displaydoc",
+ "zerovec",
 ]
 
 [[package]]
@@ -5546,6 +5646,12 @@ version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f40009d85759725a34da6d89a94e63d7bdc50a862acf0dbc7c8e488f1edcb6f5"
 
+[[package]]
+name = "writeable"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8e6ab4f5da1b24daf2c590cfac801bacb27b15b4f050e84eb60149ea726f06b"
+
 [[package]]
 name = "xattr"
 version = "0.2.2"
@@ -5598,3 +5704,71 @@ checksum = "fe5c30ade05e61656247b2e334a031dfd0cc466fadef865bdcdea8d537951bf1"
 dependencies = [
  "winapi",
 ]
+
+[[package]]
+name = "yoke"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fe1d55ca72c32d573bfbd5cb2f0ca65a497854c44762957a6d3da96041a5184"
+dependencies = [
+ "serde",
+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke-derive"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1346e4cd025ae818b88566eac7eb65ab33a994ea55f355c86889af2e7e56b14e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerofrom"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79e9355fccf72b04b7deaa99ce7a0f6630530acf34045391b74460fcd714de54"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e8aa86add9ddbd2409c1ed01e033cd457d79b1b1229b64922c25095c595e829"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9d919a74c17749ccb17beaf6405562e413cd94e98ba52ca1e64bbe7eefbd8b8"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "490e5f878c2856225e884c35927e7ea6db3c24cdb7229b72542c7526ad7ed49e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/compiler/rustc_baked_icu_data/Cargo.toml b/compiler/rustc_baked_icu_data/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "rustc_baked_icu_data"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+icu_list = "1.0.0"
+icu_locid = "1.0.0"
+icu_provider = "1.0.1"
+icu_provider_adapters = "1.0.0"
+litemap = "0.6.0"
+zerovec = "0.9.0"
+
+[features]
+rustc_use_parallel_compiler = ['icu_provider/sync']
diff --git a/compiler/rustc_baked_icu_data/src/data/any.rs b/compiler/rustc_baked_icu_data/src/data/any.rs
@@ -0,0 +1,42 @@
+// @generated
+impl AnyProvider for BakedDataProvider {
+    fn load_any(&self, key: DataKey, req: DataRequest) -> Result<AnyResponse, DataError> {
+        const ANDLISTV1MARKER: ::icu_provider::DataKeyHash =
+            ::icu_list::provider::AndListV1Marker::KEY.hashed();
+        const COLLATIONFALLBACKSUPPLEMENTV1MARKER: ::icu_provider::DataKeyHash =
+            ::icu_provider_adapters::fallback::provider::CollationFallbackSupplementV1Marker::KEY
+                .hashed();
+        const LOCALEFALLBACKLIKELYSUBTAGSV1MARKER: ::icu_provider::DataKeyHash =
+            ::icu_provider_adapters::fallback::provider::LocaleFallbackLikelySubtagsV1Marker::KEY
+                .hashed();
+        const LOCALEFALLBACKPARENTSV1MARKER: ::icu_provider::DataKeyHash =
+            ::icu_provider_adapters::fallback::provider::LocaleFallbackParentsV1Marker::KEY
+                .hashed();
+        #[allow(clippy::match_single_binding)]
+        match key.hashed() {
+            ANDLISTV1MARKER => list::and_v1::DATA
+                .get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse())
+                .copied()
+                .map(AnyPayload::from_static_ref)
+                .ok_or(DataErrorKind::MissingLocale),
+            COLLATIONFALLBACKSUPPLEMENTV1MARKER => fallback::supplement::co_v1::DATA
+                .get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse())
+                .copied()
+                .map(AnyPayload::from_static_ref)
+                .ok_or(DataErrorKind::MissingLocale),
+            LOCALEFALLBACKLIKELYSUBTAGSV1MARKER => fallback::likelysubtags_v1::DATA
+                .get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse())
+                .copied()
+                .map(AnyPayload::from_static_ref)
+                .ok_or(DataErrorKind::MissingLocale),
+            LOCALEFALLBACKPARENTSV1MARKER => fallback::parents_v1::DATA
+                .get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse())
+                .copied()
+                .map(AnyPayload::from_static_ref)
+                .ok_or(DataErrorKind::MissingLocale),
+            _ => Err(DataErrorKind::MissingDataKey),
+        }
+        .map_err(|e| e.with_req(key, req))
+        .map(|payload| AnyResponse { payload: Some(payload), metadata: Default::default() })
+    }
+}
diff --git a/compiler/rustc_baked_icu_data/src/data/fallback/likelysubtags_v1.rs b/compiler/rustc_baked_icu_data/src/data/fallback/likelysubtags_v1.rs
diff --git a/compiler/rustc_baked_icu_data/src/data/fallback/mod.rs b/compiler/rustc_baked_icu_data/src/data/fallback/mod.rs
@@ -0,0 +1,4 @@
+// @generated
+pub mod likelysubtags_v1;
+pub mod parents_v1;
+pub mod supplement;
diff --git a/compiler/rustc_baked_icu_data/src/data/fallback/parents_v1.rs b/compiler/rustc_baked_icu_data/src/data/fallback/parents_v1.rs
diff --git a/compiler/rustc_baked_icu_data/src/data/fallback/supplement/co_v1.rs b/compiler/rustc_baked_icu_data/src/data/fallback/supplement/co_v1.rs
@@ -0,0 +1,41 @@
+// @generated
+type DataStruct = < :: icu_provider_adapters :: fallback :: provider :: CollationFallbackSupplementV1Marker as :: icu_provider :: DataMarker > :: Yokeable ;
+pub static DATA: litemap::LiteMap<&str, &DataStruct, &[(&str, &DataStruct)]> =
+    litemap::LiteMap::from_sorted_store_unchecked(&[("und", UND)]);
+static UND: &DataStruct =
+    &::icu_provider_adapters::fallback::provider::LocaleFallbackSupplementV1 {
+        parents: unsafe {
+            #[allow(unused_unsafe)]
+            ::zerovec::ZeroMap::from_parts_unchecked(
+                unsafe {
+                    ::zerovec::VarZeroVec::from_bytes_unchecked(&[
+                        1u8, 0u8, 0u8, 0u8, 0u8, 0u8, 121u8, 117u8, 101u8,
+                    ])
+                },
+                unsafe {
+                    ::zerovec::ZeroVec::from_bytes_unchecked(&[
+                        122u8, 104u8, 0u8, 1u8, 72u8, 97u8, 110u8, 116u8, 0u8, 0u8, 0u8, 0u8,
+                    ])
+                },
+            )
+        },
+        unicode_extension_defaults: unsafe {
+            #[allow(unused_unsafe)]
+            ::zerovec::ZeroMap2d::from_parts_unchecked(
+                unsafe { ::zerovec::ZeroVec::from_bytes_unchecked(&[99u8, 111u8]) },
+                unsafe { ::zerovec::ZeroVec::from_bytes_unchecked(&[2u8, 0u8, 0u8, 0u8]) },
+                unsafe {
+                    ::zerovec::VarZeroVec::from_bytes_unchecked(&[
+                        2u8, 0u8, 0u8, 0u8, 0u8, 0u8, 2u8, 0u8, 122u8, 104u8, 122u8, 104u8, 45u8,
+                        72u8, 97u8, 110u8, 116u8,
+                    ])
+                },
+                unsafe {
+                    ::zerovec::VarZeroVec::from_bytes_unchecked(&[
+                        2u8, 0u8, 0u8, 0u8, 0u8, 0u8, 6u8, 0u8, 112u8, 105u8, 110u8, 121u8, 105u8,
+                        110u8, 115u8, 116u8, 114u8, 111u8, 107u8, 101u8,
+                    ])
+                },
+            )
+        },
+    };
diff --git a/compiler/rustc_baked_icu_data/src/data/fallback/supplement/mod.rs b/compiler/rustc_baked_icu_data/src/data/fallback/supplement/mod.rs
@@ -0,0 +1,2 @@
+// @generated
+pub mod co_v1;
diff --git a/compiler/rustc_baked_icu_data/src/data/list/and_v1.rs b/compiler/rustc_baked_icu_data/src/data/list/and_v1.rs
diff --git a/compiler/rustc_baked_icu_data/src/data/list/mod.rs b/compiler/rustc_baked_icu_data/src/data/list/mod.rs
@@ -0,0 +1,2 @@
+// @generated
+pub mod and_v1;
diff --git a/compiler/rustc_baked_icu_data/src/data/mod.rs b/compiler/rustc_baked_icu_data/src/data/mod.rs
@@ -0,0 +1,90 @@
+// @generated
+mod fallback;
+mod list;
+/// This data provider was programmatically generated by [`icu_datagen`](
+/// https://unicode-org.github.io/icu4x-docs/doc/icu_datagen/enum.Out.html#variant.Module).
+#[non_exhaustive]
+pub struct BakedDataProvider;
+use ::icu_provider::prelude::*;
+impl DataProvider<::icu_list::provider::AndListV1Marker> for BakedDataProvider {
+    fn load(
+        &self,
+        req: DataRequest,
+    ) -> Result<DataResponse<::icu_list::provider::AndListV1Marker>, DataError> {
+        Ok(DataResponse {
+            metadata: Default::default(),
+            payload: Some(DataPayload::from_owned(zerofrom::ZeroFrom::zero_from(
+                *list::and_v1::DATA
+                    .get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse())
+                    .ok_or_else(|| {
+                        DataErrorKind::MissingLocale
+                            .with_req(::icu_list::provider::AndListV1Marker::KEY, req)
+                    })?,
+            ))),
+        })
+    }
+}
+impl DataProvider<::icu_provider_adapters::fallback::provider::CollationFallbackSupplementV1Marker>
+    for BakedDataProvider
+{
+    fn load(
+        &self,
+        req: DataRequest,
+    ) -> Result<
+        DataResponse<
+            ::icu_provider_adapters::fallback::provider::CollationFallbackSupplementV1Marker,
+        >,
+        DataError,
+    > {
+        Ok(DataResponse {
+            metadata: Default::default(),
+            payload: Some(DataPayload::from_owned(zerofrom::ZeroFrom::zero_from(
+                *fallback::supplement::co_v1::DATA.get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse()).ok_or_else(|| {
+                    DataErrorKind::MissingLocale.with_req(::icu_provider_adapters::fallback::provider::CollationFallbackSupplementV1Marker::KEY, req)
+                })?,
+            ))),
+        })
+    }
+}
+impl DataProvider<::icu_provider_adapters::fallback::provider::LocaleFallbackLikelySubtagsV1Marker>
+    for BakedDataProvider
+{
+    fn load(
+        &self,
+        req: DataRequest,
+    ) -> Result<
+        DataResponse<
+            ::icu_provider_adapters::fallback::provider::LocaleFallbackLikelySubtagsV1Marker,
+        >,
+        DataError,
+    > {
+        Ok(DataResponse {
+            metadata: Default::default(),
+            payload: Some(DataPayload::from_owned(zerofrom::ZeroFrom::zero_from(
+                *fallback::likelysubtags_v1::DATA.get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse()).ok_or_else(|| {
+                    DataErrorKind::MissingLocale.with_req(::icu_provider_adapters::fallback::provider::LocaleFallbackLikelySubtagsV1Marker::KEY, req)
+                })?,
+            ))),
+        })
+    }
+}
+impl DataProvider<::icu_provider_adapters::fallback::provider::LocaleFallbackParentsV1Marker>
+    for BakedDataProvider
+{
+    fn load(
+        &self,
+        req: DataRequest,
+    ) -> Result<
+        DataResponse<::icu_provider_adapters::fallback::provider::LocaleFallbackParentsV1Marker>,
+        DataError,
+    > {
+        Ok(DataResponse {
+            metadata: Default::default(),
+            payload: Some(DataPayload::from_owned(zerofrom::ZeroFrom::zero_from(
+                *fallback::parents_v1::DATA.get_by(|k| req.locale.strict_cmp(k.as_bytes()).reverse()).ok_or_else(|| {
+                    DataErrorKind::MissingLocale.with_req(::icu_provider_adapters::fallback::provider::LocaleFallbackParentsV1Marker::KEY, req)
+                })?,
+            ))),
+        })
+    }
+}
diff --git a/compiler/rustc_baked_icu_data/src/lib.rs b/compiler/rustc_baked_icu_data/src/lib.rs
@@ -0,0 +1,46 @@
+//! This crate contains pre-baked ICU4X data, generated by `icu4x-datagen`. The tool
+//! fetches locale data from CLDR and transforms them into const code in statics that
+//! ICU4X can load, via databake. `lib.rs` in this crate is manually written, but all
+//! other code is generated.
+//!
+//! This crate can be regenerated when there's a new CLDR version, though that is unlikely
+//! to result in changes in most cases (currently this only covers list formatting data, which
+//! is rather stable). It may need to be regenerated when updating ICU4X versions, especially
+//! across major versions, in case it fails to compile after an update.
+//!
+//! It must be regenerated when adding new locales to Rust, or if Rust's usage of ICU4X
+//! grows to need more kinds of data.
+//!
+//! To regenerate the data, run this command:
+//!
+//! ```text
+//! icu4x-datagen -W --pretty --fingerprint --use-separate-crates \
+//! --format mod -l en es fr it ja pt ru tr zh zh-Hans zh-Hant \
+//! -k list/and@1 fallback/likelysubtags@1 fallback/parents@1 fallback/supplement/co@1 \
+//! --cldr-tag latest --icuexport-tag latest -o src/data
+//! ```
+#![allow(elided_lifetimes_in_paths)]
+
+mod data {
+    include!("data/mod.rs");
+    include!("data/any.rs");
+}
+
+pub use data::BakedDataProvider;
+
+pub const fn baked_data_provider() -> BakedDataProvider {
+    data::BakedDataProvider
+}
+
+pub mod supported_locales {
+    pub const EN: icu_locid::Locale = icu_locid::locale!("en");
+    pub const ES: icu_locid::Locale = icu_locid::locale!("es");
+    pub const FR: icu_locid::Locale = icu_locid::locale!("fr");
+    pub const IT: icu_locid::Locale = icu_locid::locale!("it");
+    pub const JA: icu_locid::Locale = icu_locid::locale!("ja");
+    pub const PT: icu_locid::Locale = icu_locid::locale!("pt");
+    pub const RU: icu_locid::Locale = icu_locid::locale!("ru");
+    pub const TR: icu_locid::Locale = icu_locid::locale!("tr");
+    pub const ZH_HANS: icu_locid::Locale = icu_locid::locale!("zh-Hans");
+    pub const ZH_HANT: icu_locid::Locale = icu_locid::locale!("zh-Hant");
+}
diff --git a/compiler/rustc_error_messages/Cargo.toml b/compiler/rustc_error_messages/Cargo.toml
@@ -9,9 +9,17 @@ edition = "2021"
 fluent-bundle = "0.15.2"
 fluent-syntax = "0.11"
 intl-memoizer = "0.5.1"
+rustc_baked_icu_data = { path = "../rustc_baked_icu_data" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
 rustc_macros = { path = "../rustc_macros" }
 tracing = "0.1"
 unic-langid = { version = "0.9.0", features = ["macros"] }
+icu_list = "1.0.0"
+writeable = "0.5.0"
+icu_locid = "1.0.0"
+icu_provider_adapters = "1.0.0"
+
+[features]
+rustc_use_parallel_compiler = ['rustc_baked_icu_data/rustc_use_parallel_compiler']
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
@@ -10,6 +10,7 @@ extern crate tracing;
 
 use fluent_bundle::FluentResource;
 use fluent_syntax::parser::ParserError;
+use icu_provider_adapters::fallback::{LocaleFallbackProvider, LocaleFallbacker};
 use rustc_data_structures::sync::Lrc;
 use rustc_macros::{fluent_messages, Decodable, Encodable};
 use rustc_span::Span;
@@ -30,8 +31,7 @@ use intl_memoizer::concurrent::IntlLangMemoizer;
 #[cfg(not(parallel_compiler))]
 use intl_memoizer::IntlLangMemoizer;
 
-pub use fluent_bundle::{self, FluentArgs, FluentError, FluentValue};
-
+pub use fluent_bundle::{self, types::FluentType, FluentArgs, FluentError, FluentValue};
 pub use unic_langid::{langid, LanguageIdentifier};
 
 // Generates `DEFAULT_LOCALE_RESOURCES` static and `fluent_generated` module.
@@ -541,3 +541,92 @@ impl From<Vec<Span>> for MultiSpan {
         MultiSpan::from_spans(spans)
     }
 }
+
+fn icu_locale_from_unic_langid(lang: LanguageIdentifier) -> Option<icu_locid::Locale> {
+    icu_locid::Locale::try_from_bytes(lang.to_string().as_bytes()).ok()
+}
+
+pub fn fluent_value_from_str_list_sep_by_and<'source>(
+    l: Vec<Cow<'source, str>>,
+) -> FluentValue<'source> {
+    // Fluent requires 'static value here for its AnyEq usages.
+    #[derive(Clone, PartialEq, Debug)]
+    struct FluentStrListSepByAnd(Vec<String>);
+
+    impl FluentType for FluentStrListSepByAnd {
+        fn duplicate(&self) -> Box<dyn FluentType + Send> {
+            Box::new(self.clone())
+        }
+
+        fn as_string(&self, intls: &intl_memoizer::IntlLangMemoizer) -> Cow<'static, str> {
+            let result = intls
+                .with_try_get::<MemoizableListFormatter, _, _>((), |list_formatter| {
+                    list_formatter.format_to_string(self.0.iter())
+                })
+                .unwrap();
+            Cow::Owned(result)
+        }
+
+        #[cfg(not(parallel_compiler))]
+        fn as_string_threadsafe(
+            &self,
+            _intls: &intl_memoizer::concurrent::IntlLangMemoizer,
+        ) -> Cow<'static, str> {
+            unreachable!("`as_string_threadsafe` is not used in non-parallel rustc")
+        }
+
+        #[cfg(parallel_compiler)]
+        fn as_string_threadsafe(
+            &self,
+            intls: &intl_memoizer::concurrent::IntlLangMemoizer,
+        ) -> Cow<'static, str> {
+            let result = intls
+                .with_try_get::<MemoizableListFormatter, _, _>((), |list_formatter| {
+                    list_formatter.format_to_string(self.0.iter())
+                })
+                .unwrap();
+            Cow::Owned(result)
+        }
+    }
+
+    struct MemoizableListFormatter(icu_list::ListFormatter);
+
+    impl std::ops::Deref for MemoizableListFormatter {
+        type Target = icu_list::ListFormatter;
+        fn deref(&self) -> &Self::Target {
+            &self.0
+        }
+    }
+
+    impl intl_memoizer::Memoizable for MemoizableListFormatter {
+        type Args = ();
+        type Error = ();
+
+        fn construct(lang: LanguageIdentifier, _args: Self::Args) -> Result<Self, Self::Error>
+        where
+            Self: Sized,
+        {
+            let baked_data_provider = rustc_baked_icu_data::baked_data_provider();
+            let locale_fallbacker =
+                LocaleFallbacker::try_new_with_any_provider(&baked_data_provider)
+                    .expect("Failed to create fallback provider");
+            let data_provider =
+                LocaleFallbackProvider::new_with_fallbacker(baked_data_provider, locale_fallbacker);
+            let locale = icu_locale_from_unic_langid(lang)
+                .unwrap_or_else(|| rustc_baked_icu_data::supported_locales::EN);
+            let list_formatter =
+                icu_list::ListFormatter::try_new_and_with_length_with_any_provider(
+                    &data_provider,
+                    &locale.into(),
+                    icu_list::ListLength::Wide,
+                )
+                .expect("Failed to create list formatter");
+
+            Ok(MemoizableListFormatter(list_formatter))
+        }
+    }
+
+    let l = l.into_iter().map(|x| x.into_owned()).collect();
+
+    FluentValue::Custom(Box::new(FluentStrListSepByAnd(l)))
+}
diff --git a/compiler/rustc_errors/Cargo.toml b/compiler/rustc_errors/Cargo.toml
@@ -27,3 +27,6 @@ serde_json = "1.0.59"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = [ "handleapi", "synchapi", "winbase" ] }
+
+[features]
+rustc_use_parallel_compiler = ['rustc_error_messages/rustc_use_parallel_compiler']
diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
@@ -4,6 +4,7 @@ use crate::{
     SubdiagnosticMessage, Substitution, SubstitutionPart, SuggestionStyle,
 };
 use rustc_data_structures::fx::FxHashMap;
+use rustc_error_messages::fluent_value_from_str_list_sep_by_and;
 use rustc_error_messages::FluentValue;
 use rustc_lint_defs::{Applicability, LintExpectationId};
 use rustc_span::edition::LATEST_STABLE_EDITION;
@@ -34,6 +35,7 @@ pub type DiagnosticArgName<'source> = Cow<'source, str>;
 pub enum DiagnosticArgValue<'source> {
     Str(Cow<'source, str>),
     Number(usize),
+    StrListSepByAnd(Vec<Cow<'source, str>>),
 }
 
 /// Converts a value of a type into a `DiagnosticArg` (typically a field of an `IntoDiagnostic`
@@ -49,6 +51,9 @@ impl<'source> IntoDiagnosticArg for DiagnosticArgValue<'source> {
         match self {
             DiagnosticArgValue::Str(s) => DiagnosticArgValue::Str(Cow::Owned(s.into_owned())),
             DiagnosticArgValue::Number(n) => DiagnosticArgValue::Number(n),
+            DiagnosticArgValue::StrListSepByAnd(l) => DiagnosticArgValue::StrListSepByAnd(
+                l.into_iter().map(|s| Cow::Owned(s.into_owned())).collect(),
+            ),
         }
     }
 }
@@ -58,6 +63,7 @@ impl<'source> Into<FluentValue<'source>> for DiagnosticArgValue<'source> {
         match self {
             DiagnosticArgValue::Str(s) => From::from(s),
             DiagnosticArgValue::Number(n) => From::from(n),
+            DiagnosticArgValue::StrListSepByAnd(l) => fluent_value_from_str_list_sep_by_and(l),
         }
     }
 }

diff --git a/compiler/rustc_errors/src/diagnostic_impls.rs b/compiler/rustc_errors/src/diagnostic_impls.rs
@@ -11,7 +11,6 @@ use rustc_target::abi::TargetDataLayoutErrors;
 use rustc_target::spec::{PanicStrategy, SplitDebuginfo, StackProtector, TargetTriple};
 use std::borrow::Cow;
 use std::fmt;
-use std::fmt::Write;
 use std::num::ParseIntError;
 use std::path::{Path, PathBuf};
 use std::process::ExitStatus;
@@ -191,23 +190,9 @@ impl From<Vec<Symbol>> for DiagnosticSymbolList {
 
 impl IntoDiagnosticArg for DiagnosticSymbolList {
     fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
-        // FIXME: replace the logic here with a real list formatter
-        let symbols = match &self.0[..] {
-            [symbol] => format!("`{symbol}`"),
-            [symbol, last] => {
-                format!("`{symbol}` and `{last}`",)
-            }
-            [symbols @ .., last] => {
-                let mut result = String::new();
-                for symbol in symbols {
-                    write!(result, "`{symbol}`, ").unwrap();
-                }
-                write!(result, "and `{last}`").unwrap();
-                result
-            }
-            [] => unreachable!(),
-        };
-        DiagnosticArgValue::Str(Cow::Owned(symbols))
+        DiagnosticArgValue::StrListSepByAnd(
+            self.0.into_iter().map(|sym| Cow::Owned(format!("`{sym}`"))).collect(),
+        )
     }
 }
 

diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
@@ -644,13 +644,14 @@ impl Handler {
         inner.stashed_diagnostics = Default::default();
     }
 
-    /// Stash a given diagnostic with the given `Span` and `StashKey` as the key for later stealing.
+    /// Stash a given diagnostic with the given `Span` and [`StashKey`] as the key.
+    /// Retrieve a stashed diagnostic with `steal_diagnostic`.
     pub fn stash_diagnostic(&self, span: Span, key: StashKey, diag: Diagnostic) {
         let mut inner = self.inner.borrow_mut();
         inner.stash((span, key), diag);
     }
 
-    /// Steal a previously stashed diagnostic with the given `Span` and `StashKey` as the key.
+    /// Steal a previously stashed diagnostic with the given `Span` and [`StashKey`] as the key.
     pub fn steal_diagnostic(&self, span: Span, key: StashKey) -> Option<DiagnosticBuilder<'_, ()>> {
         let mut inner = self.inner.borrow_mut();
         inner.steal((span, key)).map(|diag| DiagnosticBuilder::new_diagnostic(self, diag))

diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
@@ -270,6 +270,8 @@ language_item_table! {
     TryTraitBranch,          sym::branch,              branch_fn,                  Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
     TryTraitFromYeet,        sym::from_yeet,           from_yeet_fn,               Target::Fn,             GenericRequirement::None;
 
+    PointerSized,            sym::pointer_sized,       pointer_sized,              Target::Trait,          GenericRequirement::Exact(0);
+
     PollReady,               sym::Ready,               poll_ready_variant,         Target::Variant,        GenericRequirement::None;
     PollPending,             sym::Pending,             poll_pending_variant,       Target::Variant,        GenericRequirement::None;
 

diff --git a/compiler/rustc_hir_typeck/src/coercion.rs b/compiler/rustc_hir_typeck/src/coercion.rs
@@ -775,7 +775,7 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
 
         // Check the obligations of the cast -- for example, when casting
         // `usize` to `dyn* Clone + 'static`:
-        let obligations = predicates
+        let mut obligations: Vec<_> = predicates
             .iter()
             .map(|predicate| {
                 // For each existential predicate (e.g., `?Self: Clone`) substitute
@@ -785,16 +785,33 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
                 let predicate = predicate.with_self_ty(self.tcx, a);
                 Obligation::new(self.tcx, self.cause.clone(), self.param_env, predicate)
             })
-            // Enforce the region bound (e.g., `usize: 'static`, in our example).
-            .chain([Obligation::new(
+            .chain([
+                // Enforce the region bound (e.g., `usize: 'static`, in our example).
+                Obligation::new(
+                    self.tcx,
+                    self.cause.clone(),
+                    self.param_env,
+                    ty::Binder::dummy(ty::PredicateKind::TypeOutlives(ty::OutlivesPredicate(
+                        a, b_region,
+                    ))),
+                ),
+            ])
+            .collect();
+
+        // Enforce that the type is `usize`/pointer-sized. For now, only those
+        // can be coerced to `dyn*`, except for `dyn* -> dyn*` upcasts.
+        if !a.is_dyn_star() {
+            obligations.push(Obligation::new(
                 self.tcx,
                 self.cause.clone(),
                 self.param_env,
-                self.tcx.mk_predicate(ty::Binder::dummy(ty::PredicateKind::TypeOutlives(
-                    ty::OutlivesPredicate(a, b_region),
-                ))),
-            )])
-            .collect();
+                ty::Binder::dummy(ty::TraitRef::new(
+                    self.tcx.require_lang_item(hir::LangItem::PointerSized, Some(self.cause.span)),
+                    self.tcx.mk_substs_trait(a, &[]),
+                ))
+                .to_poly_trait_predicate(),
+            ));
+        }
 
         Ok(InferOk {
             value: (vec![Adjustment { kind: Adjust::DynStar, target: b }], b),

diff --git a/compiler/rustc_interface/Cargo.toml b/compiler/rustc_interface/Cargo.toml
@@ -53,4 +53,4 @@ rustc_target = { path = "../rustc_target" }
 
 [features]
 llvm = ['rustc_codegen_llvm']
-rustc_use_parallel_compiler = ['rayon', 'rustc-rayon-core', 'rustc_query_impl/rustc_use_parallel_compiler']
+rustc_use_parallel_compiler = ['rayon', 'rustc-rayon-core', 'rustc_query_impl/rustc_use_parallel_compiler', 'rustc_errors/rustc_use_parallel_compiler']
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
@@ -1067,6 +1067,7 @@ symbols! {
         plugins,
         pointee_trait,
         pointer,
+        pointer_sized,
         poll,
         position,
         post_dash_lto: "post-lto",

diff --git a/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs b/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
@@ -304,6 +304,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 self.assemble_candidates_for_transmutability(obligation, &mut candidates);
             } else if lang_items.tuple_trait() == Some(def_id) {
                 self.assemble_candidate_for_tuple(obligation, &mut candidates);
+            } else if lang_items.pointer_sized() == Some(def_id) {
+                self.assemble_candidate_for_ptr_sized(obligation, &mut candidates);
             } else {
                 if lang_items.clone_trait() == Some(def_id) {
                     // Same builtin conditions as `Copy`, i.e., every type which has builtin support
@@ -1047,4 +1049,30 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             | ty::Placeholder(_) => {}
         }
     }
+
+    fn assemble_candidate_for_ptr_sized(
+        &mut self,
+        obligation: &TraitObligation<'tcx>,
+        candidates: &mut SelectionCandidateSet<'tcx>,
+    ) {
+        // The regions of a type don't affect the size of the type
+        let self_ty = self
+            .tcx()
+            .erase_regions(self.tcx().erase_late_bound_regions(obligation.predicate.self_ty()));
+
+        // But if there are inference variables, we have to wait until it's resolved.
+        if self_ty.has_non_region_infer() {
+            candidates.ambiguous = true;
+            return;
+        }
+
+        let usize_layout =
+            self.tcx().layout_of(ty::ParamEnv::empty().and(self.tcx().types.usize)).unwrap().layout;
+        if let Ok(layout) = self.tcx().layout_of(obligation.param_env.and(self_ty))
+            && layout.layout.size() == usize_layout.size()
+            && layout.layout.align().abi == usize_layout.align().abi
+        {
+            candidates.vec.push(BuiltinCandidate { has_nested: false });
+        }
+    }
 }
diff --git a/library/core/src/alloc/layout.rs b/library/core/src/alloc/layout.rs
@@ -157,9 +157,10 @@ impl Layout {
     /// allocate backing structure for `T` (which could be a trait
     /// or other unsized type like a slice).
     #[stable(feature = "alloc_layout", since = "1.28.0")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[must_use]
     #[inline]
-    pub fn for_value<T: ?Sized>(t: &T) -> Self {
+    pub const fn for_value<T: ?Sized>(t: &T) -> Self {
         let (size, align) = (mem::size_of_val(t), mem::align_of_val(t));
         // SAFETY: see rationale in `new` for why this is using the unsafe variant
         unsafe { Layout::from_size_align_unchecked(size, align) }
@@ -191,8 +192,9 @@ impl Layout {
     /// [trait object]: ../../book/ch17-02-trait-objects.html
     /// [extern type]: ../../unstable-book/language-features/extern-types.html
     #[unstable(feature = "layout_for_ptr", issue = "69835")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[must_use]
-    pub unsafe fn for_value_raw<T: ?Sized>(t: *const T) -> Self {
+    pub const unsafe fn for_value_raw<T: ?Sized>(t: *const T) -> Self {
         // SAFETY: we pass along the prerequisites of these functions to the caller
         let (size, align) = unsafe { (mem::size_of_val_raw(t), mem::align_of_val_raw(t)) };
         // SAFETY: see rationale in `new` for why this is using the unsafe variant
@@ -229,8 +231,9 @@ impl Layout {
     /// Returns an error if the combination of `self.size()` and the given
     /// `align` violates the conditions listed in [`Layout::from_size_align`].
     #[stable(feature = "alloc_layout_manipulation", since = "1.44.0")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[inline]
-    pub fn align_to(&self, align: usize) -> Result<Self, LayoutError> {
+    pub const fn align_to(&self, align: usize) -> Result<Self, LayoutError> {
         Layout::from_size_align(self.size(), cmp::max(self.align(), align))
     }
 
@@ -287,10 +290,11 @@ impl Layout {
     /// This is equivalent to adding the result of `padding_needed_for`
     /// to the layout's current size.
     #[stable(feature = "alloc_layout_manipulation", since = "1.44.0")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[must_use = "this returns a new `Layout`, \
                   without modifying the original"]
     #[inline]
-    pub fn pad_to_align(&self) -> Layout {
+    pub const fn pad_to_align(&self) -> Layout {
         let pad = self.padding_needed_for(self.align());
         // This cannot overflow. Quoting from the invariant of Layout:
         // > `size`, when rounded up to the nearest multiple of `align`,
@@ -311,8 +315,9 @@ impl Layout {
     ///
     /// On arithmetic overflow, returns `LayoutError`.
     #[unstable(feature = "alloc_layout_extra", issue = "55724")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[inline]
-    pub fn repeat(&self, n: usize) -> Result<(Self, usize), LayoutError> {
+    pub const fn repeat(&self, n: usize) -> Result<(Self, usize), LayoutError> {
         // This cannot overflow. Quoting from the invariant of Layout:
         // > `size`, when rounded up to the nearest multiple of `align`,
         // > must not overflow isize (i.e., the rounded value must be
@@ -321,7 +326,8 @@ impl Layout {
         let alloc_size = padded_size.checked_mul(n).ok_or(LayoutError)?;
 
         // The safe constructor is called here to enforce the isize size limit.
-        Layout::from_size_alignment(alloc_size, self.align).map(|layout| (layout, padded_size))
+        let layout = Layout::from_size_alignment(alloc_size, self.align)?;
+        Ok((layout, padded_size))
     }
 
     /// Creates a layout describing the record for `self` followed by
@@ -370,8 +376,9 @@ impl Layout {
     /// # assert_eq!(repr_c(&[u64, u32, u16, u32]), Ok((s, vec![0, 8, 12, 16])));
     /// ```
     #[stable(feature = "alloc_layout_manipulation", since = "1.44.0")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[inline]
-    pub fn extend(&self, next: Self) -> Result<(Self, usize), LayoutError> {
+    pub const fn extend(&self, next: Self) -> Result<(Self, usize), LayoutError> {
         let new_align = cmp::max(self.align, next.align);
         let pad = self.padding_needed_for(next.align());
 
@@ -396,8 +403,9 @@ impl Layout {
     ///
     /// On arithmetic overflow, returns `LayoutError`.
     #[unstable(feature = "alloc_layout_extra", issue = "55724")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[inline]
-    pub fn repeat_packed(&self, n: usize) -> Result<Self, LayoutError> {
+    pub const fn repeat_packed(&self, n: usize) -> Result<Self, LayoutError> {
         let size = self.size().checked_mul(n).ok_or(LayoutError)?;
         // The safe constructor is called here to enforce the isize size limit.
         Layout::from_size_alignment(size, self.align)
@@ -410,8 +418,9 @@ impl Layout {
     ///
     /// On arithmetic overflow, returns `LayoutError`.
     #[unstable(feature = "alloc_layout_extra", issue = "55724")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[inline]
-    pub fn extend_packed(&self, next: Self) -> Result<Self, LayoutError> {
+    pub const fn extend_packed(&self, next: Self) -> Result<Self, LayoutError> {
         let new_size = self.size().checked_add(next.size()).ok_or(LayoutError)?;
         // The safe constructor is called here to enforce the isize size limit.
         Layout::from_size_alignment(new_size, self.align)
@@ -422,13 +431,18 @@ impl Layout {
     /// On arithmetic overflow or when the total size would exceed
     /// `isize::MAX`, returns `LayoutError`.
     #[stable(feature = "alloc_layout_manipulation", since = "1.44.0")]
+    #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
     #[inline]
-    pub fn array<T>(n: usize) -> Result<Self, LayoutError> {
+    pub const fn array<T>(n: usize) -> Result<Self, LayoutError> {
         // Reduce the amount of code we need to monomorphize per `T`.
         return inner(mem::size_of::<T>(), Alignment::of::<T>(), n);
 
         #[inline]
-        fn inner(element_size: usize, align: Alignment, n: usize) -> Result<Layout, LayoutError> {
+        const fn inner(
+            element_size: usize,
+            align: Alignment,
+            n: usize,
+        ) -> Result<Layout, LayoutError> {
             // We need to check two things about the size:
             //  - That the total size won't overflow a `usize`, and
             //  - That the total size still fits in an `isize`.

diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
@@ -98,6 +98,8 @@
 // Library features:
 #![feature(const_align_offset)]
 #![feature(const_align_of_val)]
+#![feature(const_align_of_val_raw)]
+#![feature(const_alloc_layout)]
 #![feature(const_arguments_as_str)]
 #![feature(const_array_into_iter_constructors)]
 #![feature(const_bigint_helper_methods)]
@@ -131,12 +133,14 @@
 #![feature(const_pin)]
 #![feature(const_ptr_sub_ptr)]
 #![feature(const_replace)]
+#![feature(const_result_drop)]
 #![feature(const_ptr_as_ref)]
 #![feature(const_ptr_is_null)]
 #![feature(const_ptr_read)]
 #![feature(const_ptr_write)]
 #![feature(const_raw_ptr_comparison)]
 #![feature(const_size_of_val)]
+#![feature(const_size_of_val_raw)]
 #![feature(const_slice_from_raw_parts_mut)]
 #![feature(const_slice_ptr_len)]
 #![feature(const_slice_split_at_mut)]
@@ -151,10 +155,12 @@
 #![feature(const_unsafecell_get_mut)]
 #![feature(const_waker)]
 #![feature(core_panic)]
+#![cfg_attr(not(bootstrap), feature(derive_const))]
 #![feature(duration_consts_float)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(ptr_alignment_type)]
 #![feature(ptr_metadata)]
+#![feature(set_ptr_value)]
 #![feature(slice_ptr_get)]
 #![feature(slice_split_at_unchecked)]
 #![feature(str_internals)]

diff --git a/library/core/src/marker.rs b/library/core/src/marker.rs
@@ -809,6 +809,15 @@ pub trait Destruct {}
 #[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
 pub trait Tuple {}
 
+/// A marker for things
+#[unstable(feature = "pointer_sized_trait", issue = "none")]
+#[cfg_attr(not(bootstrap), lang = "pointer_sized")]
+#[rustc_on_unimplemented(
+    message = "`{Self}` needs to be a pointer-sized type",
+    label = "`{Self}` needs to be a pointer-sized type"
+)]
+pub trait PointerSized {}
+
 /// Implementations of `Copy` for primitive types.
 ///
 /// Implementations that cannot be described in Rust

diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs
@@ -761,10 +761,11 @@ macro_rules! int_impl {
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-        pub const unsafe fn unchecked_shl(self, rhs: Self) -> Self {
+        pub const unsafe fn unchecked_shl(self, rhs: u32) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shl`.
-            unsafe { intrinsics::unchecked_shl(self, rhs) }
+            // Any legal shift amount is losslessly representable in the self type.
+            unsafe { intrinsics::unchecked_shl(self, rhs.try_into().ok().unwrap_unchecked()) }
         }
 
         /// Checked shift right. Computes `self >> rhs`, returning `None` if `rhs` is
@@ -808,10 +809,11 @@ macro_rules! int_impl {
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-        pub const unsafe fn unchecked_shr(self, rhs: Self) -> Self {
+        pub const unsafe fn unchecked_shr(self, rhs: u32) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shr`.
-            unsafe { intrinsics::unchecked_shr(self, rhs) }
+            // Any legal shift amount is losslessly representable in the self type.
+            unsafe { intrinsics::unchecked_shr(self, rhs.try_into().ok().unwrap_unchecked()) }
         }
 
         /// Checked absolute value. Computes `self.abs()`, returning `None` if
@@ -1358,11 +1360,12 @@ macro_rules! int_impl {
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
+        #[rustc_allow_const_fn_unstable(const_inherent_unchecked_arith)]
         pub const fn wrapping_shl(self, rhs: u32) -> Self {
             // SAFETY: the masking by the bitsize of the type ensures that we do not shift
             // out of bounds
             unsafe {
-                intrinsics::unchecked_shl(self, (rhs & ($BITS - 1)) as $SelfT)
+                self.unchecked_shl(rhs & ($BITS - 1))
             }
         }
 
@@ -1387,11 +1390,12 @@ macro_rules! int_impl {
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
+        #[rustc_allow_const_fn_unstable(const_inherent_unchecked_arith)]
         pub const fn wrapping_shr(self, rhs: u32) -> Self {
             // SAFETY: the masking by the bitsize of the type ensures that we do not shift
             // out of bounds
             unsafe {
-                intrinsics::unchecked_shr(self, (rhs & ($BITS - 1)) as $SelfT)
+                self.unchecked_shr(rhs & ($BITS - 1))
             }
         }
 

diff --git a/library/core/src/num/mod.rs b/library/core/src/num/mod.rs
@@ -3,6 +3,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use crate::ascii;
+use crate::convert::TryInto;
 use crate::error::Error;
 use crate::intrinsics;
 use crate::mem;

diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
@@ -908,10 +908,11 @@ macro_rules! uint_impl {
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-        pub const unsafe fn unchecked_shl(self, rhs: Self) -> Self {
+        pub const unsafe fn unchecked_shl(self, rhs: u32) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shl`.
-            unsafe { intrinsics::unchecked_shl(self, rhs) }
+            // Any legal shift amount is losslessly representable in the self type.
+            unsafe { intrinsics::unchecked_shl(self, rhs.try_into().ok().unwrap_unchecked()) }
         }
 
         /// Checked shift right. Computes `self >> rhs`, returning `None`
@@ -955,10 +956,11 @@ macro_rules! uint_impl {
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-        pub const unsafe fn unchecked_shr(self, rhs: Self) -> Self {
+        pub const unsafe fn unchecked_shr(self, rhs: u32) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shr`.
-            unsafe { intrinsics::unchecked_shr(self, rhs) }
+            // Any legal shift amount is losslessly representable in the self type.
+            unsafe { intrinsics::unchecked_shr(self, rhs.try_into().ok().unwrap_unchecked()) }
         }
 
         /// Checked exponentiation. Computes `self.pow(exp)`, returning `None` if
@@ -1374,11 +1376,12 @@ macro_rules! uint_impl {
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
+        #[rustc_allow_const_fn_unstable(const_inherent_unchecked_arith)]
         pub const fn wrapping_shl(self, rhs: u32) -> Self {
             // SAFETY: the masking by the bitsize of the type ensures that we do not shift
             // out of bounds
             unsafe {
-                intrinsics::unchecked_shl(self, (rhs & ($BITS - 1)) as $SelfT)
+                self.unchecked_shl(rhs & ($BITS - 1))
             }
         }
 
@@ -1406,11 +1409,12 @@ macro_rules! uint_impl {
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
+        #[rustc_allow_const_fn_unstable(const_inherent_unchecked_arith)]
         pub const fn wrapping_shr(self, rhs: u32) -> Self {
             // SAFETY: the masking by the bitsize of the type ensures that we do not shift
             // out of bounds
             unsafe {
-                intrinsics::unchecked_shr(self, (rhs & ($BITS - 1)) as $SelfT)
+                self.unchecked_shr(rhs & ($BITS - 1))
             }
         }
 

diff --git a/library/core/src/ptr/alignment.rs b/library/core/src/ptr/alignment.rs
@@ -9,7 +9,9 @@ use crate::{cmp, fmt, hash, mem, num};
 /// Note that particularly large alignments, while representable in this type,
 /// are likely not to be supported by actual allocators and linkers.
 #[unstable(feature = "ptr_alignment_type", issue = "102070")]
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq)]
+#[cfg_attr(bootstrap, derive(PartialEq))]
+#[cfg_attr(not(bootstrap), derive_const(PartialEq))]
 #[repr(transparent)]
 pub struct Alignment(AlignmentEnum);
 
@@ -167,16 +169,18 @@ impl From<Alignment> for usize {
     }
 }
 
+#[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
 #[unstable(feature = "ptr_alignment_type", issue = "102070")]
-impl cmp::Ord for Alignment {
+impl const cmp::Ord for Alignment {
     #[inline]
     fn cmp(&self, other: &Self) -> cmp::Ordering {
-        self.as_nonzero().cmp(&other.as_nonzero())
+        self.as_nonzero().get().cmp(&other.as_nonzero().get())
     }
 }
 
+#[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
 #[unstable(feature = "ptr_alignment_type", issue = "102070")]
-impl cmp::PartialOrd for Alignment {
+impl const cmp::PartialOrd for Alignment {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
         Some(self.cmp(other))
@@ -198,7 +202,9 @@ type AlignmentEnum = AlignmentEnum32;
 #[cfg(target_pointer_width = "64")]
 type AlignmentEnum = AlignmentEnum64;
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq)]
+#[cfg_attr(bootstrap, derive(PartialEq))]
+#[cfg_attr(not(bootstrap), derive_const(PartialEq))]
 #[repr(u16)]
 enum AlignmentEnum16 {
     _Align1Shl0 = 1 << 0,
@@ -219,7 +225,9 @@ enum AlignmentEnum16 {
     _Align1Shl15 = 1 << 15,
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq)]
+#[cfg_attr(bootstrap, derive(PartialEq))]
+#[cfg_attr(not(bootstrap), derive_const(PartialEq))]
 #[repr(u32)]
 enum AlignmentEnum32 {
     _Align1Shl0 = 1 << 0,
@@ -256,7 +264,9 @@ enum AlignmentEnum32 {
     _Align1Shl31 = 1 << 31,
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq)]
+#[cfg_attr(bootstrap, derive(PartialEq))]
+#[cfg_attr(not(bootstrap), derive_const(PartialEq))]
 #[repr(u64)]
 enum AlignmentEnum64 {
     _Align1Shl0 = 1 << 0,

diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
@@ -79,19 +79,14 @@ impl<T: ?Sized> *const T {
     /// }
     /// ```
     #[unstable(feature = "set_ptr_value", issue = "75091")]
+    #[rustc_const_unstable(feature = "set_ptr_value", issue = "75091")]
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[inline]
-    pub fn with_metadata_of<U>(self, mut val: *const U) -> *const U
+    pub const fn with_metadata_of<U>(self, meta: *const U) -> *const U
     where
         U: ?Sized,
     {
-        let target = &mut val as *mut *const U as *mut *const u8;
-        // SAFETY: In case of a thin pointer, this operations is identical
-        // to a simple assignment. In case of a fat pointer, with the current
-        // fat pointer layout implementation, the first field of such a
-        // pointer is always the data pointer, which is likewise assigned.
-        unsafe { *target = self as *const u8 };
-        val
+        from_raw_parts::<U>(self as *const (), metadata(meta))
     }
 
     /// Changes constness without changing the type.
@@ -478,8 +473,7 @@ impl<T: ?Sized> *const T {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_offset(self, count: isize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `offset`.
-        let this = unsafe { self.cast::<u8>().offset(count).cast::<()>() };
-        from_raw_parts::<T>(this, metadata(self))
+        unsafe { self.cast::<u8>().offset(count).with_metadata_of(self) }
     }
 
     /// Calculates the offset from a pointer using wrapping arithmetic.
@@ -559,7 +553,7 @@ impl<T: ?Sized> *const T {
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
     pub const fn wrapping_byte_offset(self, count: isize) -> Self {
-        from_raw_parts::<T>(self.cast::<u8>().wrapping_offset(count).cast::<()>(), metadata(self))
+        self.cast::<u8>().wrapping_offset(count).with_metadata_of(self)
     }
 
     /// Masks out bits of the pointer according to a mask.
@@ -597,8 +591,7 @@ impl<T: ?Sized> *const T {
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[inline(always)]
     pub fn mask(self, mask: usize) -> *const T {
-        let this = intrinsics::ptr_mask(self.cast::<()>(), mask);
-        from_raw_parts::<T>(this, metadata(self))
+        intrinsics::ptr_mask(self.cast::<()>(), mask).with_metadata_of(self)
     }
 
     /// Calculates the distance between two pointers. The returned value is in
@@ -939,8 +932,7 @@ impl<T: ?Sized> *const T {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_add(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `add`.
-        let this = unsafe { self.cast::<u8>().add(count).cast::<()>() };
-        from_raw_parts::<T>(this, metadata(self))
+        unsafe { self.cast::<u8>().add(count).with_metadata_of(self) }
     }
 
     /// Calculates the offset from a pointer (convenience for
@@ -1026,8 +1018,7 @@ impl<T: ?Sized> *const T {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_sub(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `sub`.
-        let this = unsafe { self.cast::<u8>().sub(count).cast::<()>() };
-        from_raw_parts::<T>(this, metadata(self))
+        unsafe { self.cast::<u8>().sub(count).with_metadata_of(self) }
     }
 
     /// Calculates the offset from a pointer using wrapping arithmetic.
@@ -1107,7 +1098,7 @@ impl<T: ?Sized> *const T {
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
     pub const fn wrapping_byte_add(self, count: usize) -> Self {
-        from_raw_parts::<T>(self.cast::<u8>().wrapping_add(count).cast::<()>(), metadata(self))
+        self.cast::<u8>().wrapping_add(count).with_metadata_of(self)
     }
 
     /// Calculates the offset from a pointer using wrapping arithmetic.
@@ -1187,7 +1178,7 @@ impl<T: ?Sized> *const T {
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
     pub const fn wrapping_byte_sub(self, count: usize) -> Self {
-        from_raw_parts::<T>(self.cast::<u8>().wrapping_sub(count).cast::<()>(), metadata(self))
+        self.cast::<u8>().wrapping_sub(count).with_metadata_of(self)
     }
 
     /// Reads the value from `self` without moving it. This leaves the

diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
@@ -78,23 +78,14 @@ impl<T: ?Sized> *mut T {
     /// }
     /// ```
     #[unstable(feature = "set_ptr_value", issue = "75091")]
+    #[rustc_const_unstable(feature = "set_ptr_value", issue = "75091")]
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[inline]
-    pub fn with_metadata_of<U>(self, val: *const U) -> *mut U
+    pub const fn with_metadata_of<U>(self, meta: *const U) -> *mut U
     where
         U: ?Sized,
     {
-        // Prepare in the type system that we will replace the pointer value with a mutable
-        // pointer, taking the mutable provenance from the `self` pointer.
-        let mut val = val as *mut U;
-        // Pointer to the pointer value within the value.
-        let target = &mut val as *mut *mut U as *mut *mut u8;
-        // SAFETY: In case of a thin pointer, this operations is identical
-        // to a simple assignment. In case of a fat pointer, with the current
-        // fat pointer layout implementation, the first field of such a
-        // pointer is always the data pointer, which is likewise assigned.
-        unsafe { *target = self as *mut u8 };
-        val
+        from_raw_parts_mut::<U>(self as *mut (), metadata(meta))
     }
 
     /// Changes constness without changing the type.
@@ -496,8 +487,7 @@ impl<T: ?Sized> *mut T {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_offset(self, count: isize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `offset`.
-        let this = unsafe { self.cast::<u8>().offset(count).cast::<()>() };
-        from_raw_parts_mut::<T>(this, metadata(self))
+        unsafe { self.cast::<u8>().offset(count).with_metadata_of(self) }
     }
 
     /// Calculates the offset from a pointer using wrapping arithmetic.
@@ -576,10 +566,7 @@ impl<T: ?Sized> *mut T {
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
     pub const fn wrapping_byte_offset(self, count: isize) -> Self {
-        from_raw_parts_mut::<T>(
-            self.cast::<u8>().wrapping_offset(count).cast::<()>(),
-            metadata(self),
-        )
+        self.cast::<u8>().wrapping_offset(count).with_metadata_of(self)
     }
 
     /// Masks out bits of the pointer according to a mask.
@@ -620,8 +607,7 @@ impl<T: ?Sized> *mut T {
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[inline(always)]
     pub fn mask(self, mask: usize) -> *mut T {
-        let this = intrinsics::ptr_mask(self.cast::<()>(), mask) as *mut ();
-        from_raw_parts_mut::<T>(this, metadata(self))
+        intrinsics::ptr_mask(self.cast::<()>(), mask).cast_mut().with_metadata_of(self)
     }
 
     /// Returns `None` if the pointer is null, or else returns a unique reference to
@@ -1048,8 +1034,7 @@ impl<T: ?Sized> *mut T {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_add(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `add`.
-        let this = unsafe { self.cast::<u8>().add(count).cast::<()>() };
-        from_raw_parts_mut::<T>(this, metadata(self))
+        unsafe { self.cast::<u8>().add(count).with_metadata_of(self) }
     }
 
     /// Calculates the offset from a pointer (convenience for
@@ -1135,8 +1120,7 @@ impl<T: ?Sized> *mut T {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_sub(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `sub`.
-        let this = unsafe { self.cast::<u8>().sub(count).cast::<()>() };
-        from_raw_parts_mut::<T>(this, metadata(self))
+        unsafe { self.cast::<u8>().sub(count).with_metadata_of(self) }
     }
 
     /// Calculates the offset from a pointer using wrapping arithmetic.
@@ -1216,7 +1200,7 @@ impl<T: ?Sized> *mut T {
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
     pub const fn wrapping_byte_add(self, count: usize) -> Self {
-        from_raw_parts_mut::<T>(self.cast::<u8>().wrapping_add(count).cast::<()>(), metadata(self))
+        self.cast::<u8>().wrapping_add(count).with_metadata_of(self)
     }
 
     /// Calculates the offset from a pointer using wrapping arithmetic.
@@ -1296,7 +1280,7 @@ impl<T: ?Sized> *mut T {
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
     pub const fn wrapping_byte_sub(self, count: usize) -> Self {
-        from_raw_parts_mut::<T>(self.cast::<u8>().wrapping_sub(count).cast::<()>(), metadata(self))
+        self.cast::<u8>().wrapping_sub(count).with_metadata_of(self)
     }
 
     /// Reads the value from `self` without moving it. This leaves the

diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
@@ -3752,9 +3752,9 @@ impl<T> [T] {
     /// [`is_sorted`]: slice::is_sorted
     #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
     #[must_use]
-    pub fn is_sorted_by<F>(&self, mut compare: F) -> bool
+    pub fn is_sorted_by<'a, F>(&'a self, mut compare: F) -> bool
     where
-        F: FnMut(&T, &T) -> Option<Ordering>,
+        F: FnMut(&'a T, &'a T) -> Option<Ordering>,
     {
         self.iter().is_sorted_by(|a, b| compare(*a, *b))
     }
@@ -3778,9 +3778,9 @@ impl<T> [T] {
     #[inline]
     #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
     #[must_use]
-    pub fn is_sorted_by_key<F, K>(&self, f: F) -> bool
+    pub fn is_sorted_by_key<'a, F, K>(&'a self, f: F) -> bool
     where
-        F: FnMut(&T) -> K,
+        F: FnMut(&'a T) -> K,
         K: PartialOrd,
     {
         self.iter().is_sorted_by_key(f)

diff --git a/src/librustdoc/html/render/print_item.rs b/src/librustdoc/html/render/print_item.rs
@@ -19,8 +19,8 @@ use super::{
     collect_paths_for_type, document, ensure_trailing_slash, get_filtered_impls_for_reference,
     item_ty_to_section, notable_traits_button, notable_traits_json, render_all_impls,
     render_assoc_item, render_assoc_items, render_attributes_in_code, render_attributes_in_pre,
-    render_impl, render_rightside, render_stability_since_raw, AssocItemLink, Context,
-    ImplRenderingParameters,
+    render_impl, render_rightside, render_stability_since_raw,
+    render_stability_since_raw_with_extra, AssocItemLink, Context, ImplRenderingParameters,
 };
 use crate::clean;
 use crate::config::ModuleSorting;
@@ -1267,30 +1267,30 @@ fn item_enum(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, e: &clean::
             document_non_exhaustive_header(it)
         );
         document_non_exhaustive(w, it);
+        write!(w, "<div class=\"variants\">");
         for variant in e.variants() {
             let id = cx.derive_id(format!("{}.{}", ItemType::Variant, variant.name.unwrap()));
             write!(
                 w,
-                "<h3 id=\"{id}\" class=\"variant small-section-header\">\
-                    <a href=\"#{id}\" class=\"anchor field\"></a>\
-                    <code>{name}",
+                "<section id=\"{id}\" class=\"variant\">\
+                    <a href=\"#{id}\" class=\"anchor\"></a>",
                 id = id,
-                name = variant.name.unwrap()
             );
-            if let clean::VariantItem(clean::Variant::Tuple(ref s)) = *variant.kind {
-                w.write_str("(");
-                print_tuple_struct_fields(w, cx, s);
-                w.write_str(")");
-            }
-            w.write_str("</code>");
-            render_stability_since_raw(
+            render_stability_since_raw_with_extra(
                 w,
                 variant.stable_since(tcx),
                 variant.const_stability(tcx),
                 it.stable_since(tcx),
                 it.const_stable_since(tcx),
+                " rightside",
             );
-            w.write_str("</h3>");
+            write!(w, "<h3 class=\"code-header\">{name}", name = variant.name.unwrap());
+            if let clean::VariantItem(clean::Variant::Tuple(ref s)) = *variant.kind {
+                w.write_str("(");
+                print_tuple_struct_fields(w, cx, s);
+                w.write_str(")");
+            }
+            w.write_str("</h3></section>");
 
             use crate::clean::Variant;
 
@@ -1324,7 +1324,7 @@ fn item_enum(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, e: &clean::
                             write!(
                                 w,
                                 "<div class=\"sub-variant-field\">\
-                                 <span id=\"{id}\" class=\"variant small-section-header\">\
+                                 <span id=\"{id}\" class=\"small-section-header\">\
                                      <a href=\"#{id}\" class=\"anchor field\"></a>\
                                      <code>{f}:&nbsp;{t}</code>\
                                  </span>",
@@ -1343,6 +1343,7 @@ fn item_enum(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, e: &clean::
 
             document(w, cx, variant, Some(it), HeadingOffset::H4);
         }
+        write!(w, "</div>");
     }
     let def_id = it.item_id.expect_def_id();
     render_assoc_items(w, cx, it, def_id, AssocItemRender::All);

diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
@@ -706,16 +706,14 @@ a {
 }
 
 .small-section-header {
-	display: flex;
-	justify-content: space-between;
 	position: relative;
 }
 
 .small-section-header:hover > .anchor {
 	display: initial;
 }
 
-.impl:hover > .anchor, .trait-impl:hover > .anchor {
+.impl:hover > .anchor, .trait-impl:hover > .anchor, .variant:hover > .anchor {
 	display: inline-block;
 	position: absolute;
 }
@@ -1234,12 +1232,6 @@ a.test-arrow:hover {
 	font-size: 1.25rem;
 }
 
-h3.variant {
-	font-weight: 600;
-	font-size: 1.125rem;
-	margin-bottom: 10px;
-}
-
 .sub-variant h4 {
 	font-size: 1rem;
 	font-weight: 400;
@@ -1908,6 +1900,7 @@ in storage.js
 	}
 }
 
+.variant,
 .implementors-toggle > summary,
 .impl,
 #implementors-list > .docblock,
@@ -1919,6 +1912,7 @@ in storage.js
 	margin-bottom: 0.75em;
 }
 
+.variants > .docblock,
 .impl-items > .rustdoc-toggle[open]:not(:last-child),
 .methods > .rustdoc-toggle[open]:not(:last-child),
 .implementors-toggle[open]:not(:last-child) {

diff --git a/src/test/codegen/unchecked_shifts.rs b/src/test/codegen/unchecked_shifts.rs
@@ -0,0 +1,66 @@
+// compile-flags: -O
+// min-llvm-version: 15.0 (LLVM 13 in CI does this differently from submodule LLVM)
+// ignore-debug (because unchecked is checked in debug)
+
+#![crate_type = "lib"]
+#![feature(unchecked_math)]
+
+// CHECK-LABEL: @unchecked_shl_unsigned_same
+#[no_mangle]
+pub unsafe fn unchecked_shl_unsigned_same(a: u32, b: u32) -> u32 {
+    // CHECK-NOT: and i32
+    // CHECK: shl i32 %a, %b
+    // CHECK-NOT: and i32
+    a.unchecked_shl(b)
+}
+
+// CHECK-LABEL: @unchecked_shl_unsigned_smaller
+#[no_mangle]
+pub unsafe fn unchecked_shl_unsigned_smaller(a: u16, b: u32) -> u16 {
+    // This uses -DAG to avoid failing on irrelevant reorderings,
+    // like emitting the truncation earlier.
+
+    // CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 65536
+    // CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
+    // CHECK-DAG: %[[TRUNC:.+]] = trunc i32 %b to i16
+    // CHECK-DAG: shl i16 %a, %[[TRUNC]]
+    a.unchecked_shl(b)
+}
+
+// CHECK-LABEL: @unchecked_shl_unsigned_bigger
+#[no_mangle]
+pub unsafe fn unchecked_shl_unsigned_bigger(a: u64, b: u32) -> u64 {
+    // CHECK: %[[EXT:.+]] = zext i32 %b to i64
+    // CHECK: shl i64 %a, %[[EXT]]
+    a.unchecked_shl(b)
+}
+
+// CHECK-LABEL: @unchecked_shr_signed_same
+#[no_mangle]
+pub unsafe fn unchecked_shr_signed_same(a: i32, b: u32) -> i32 {
+    // CHECK-NOT: and i32
+    // CHECK: ashr i32 %a, %b
+    // CHECK-NOT: and i32
+    a.unchecked_shr(b)
+}
+
+// CHECK-LABEL: @unchecked_shr_signed_smaller
+#[no_mangle]
+pub unsafe fn unchecked_shr_signed_smaller(a: i16, b: u32) -> i16 {
+    // This uses -DAG to avoid failing on irrelevant reorderings,
+    // like emitting the truncation earlier.
+
+    // CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 32768
+    // CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
+    // CHECK-DAG: %[[TRUNC:.+]] = trunc i32 %b to i16
+    // CHECK-DAG: ashr i16 %a, %[[TRUNC]]
+    a.unchecked_shr(b)
+}
+
+// CHECK-LABEL: @unchecked_shr_signed_bigger
+#[no_mangle]
+pub unsafe fn unchecked_shr_signed_bigger(a: i64, b: u32) -> i64 {
+    // CHECK: %[[EXT:.+]] = zext i32 %b to i64
+    // CHECK: ashr i64 %a, %[[EXT]]
+    a.unchecked_shr(b)
+}
diff --git a/src/test/rustdoc-gui/enum-variants.goml b/src/test/rustdoc-gui/enum-variants.goml
@@ -0,0 +1,5 @@
+// Verifies that there is non-zero margin on variants and their docblocks.
+goto: "file://" + |DOC_PATH| + "/test_docs/enum.WhoLetTheDogOut.html"
+
+assert-css: (".variants > .variant", {"margin": "0px 0px 12px"})
+assert-css: (".variants > .docblock", {"margin": "0px 0px 32px 24px"})
diff --git a/src/test/rustdoc/issue-88600.rs b/src/test/rustdoc/issue-88600.rs
@@ -8,22 +8,22 @@ pub struct S;
 
 // @has issue_88600/enum.FooEnum.html
 pub enum FooEnum {
-    // @has - '//*[@id="variant.HiddenTupleItem"]//code' 'HiddenTupleItem(_)'
+    // @has - '//*[@id="variant.HiddenTupleItem"]//h3' 'HiddenTupleItem(_)'
     // @count - '//*[@id="variant.HiddenTupleItem.field.0"]' 0
     HiddenTupleItem(#[doc(hidden)] H),
-    // @has - '//*[@id="variant.MultipleHidden"]//code' 'MultipleHidden(_, _)'
+    // @has - '//*[@id="variant.MultipleHidden"]//h3' 'MultipleHidden(_, _)'
     // @count - '//*[@id="variant.MultipleHidden.field.0"]' 0
     // @count - '//*[@id="variant.MultipleHidden.field.1"]' 0
     MultipleHidden(#[doc(hidden)] H, #[doc(hidden)] H),
-    // @has - '//*[@id="variant.MixedHiddenFirst"]//code' 'MixedHiddenFirst(_, S)'
+    // @has - '//*[@id="variant.MixedHiddenFirst"]//h3' 'MixedHiddenFirst(_, S)'
     // @count - '//*[@id="variant.MixedHiddenFirst.field.0"]' 0
     // @has - '//*[@id="variant.MixedHiddenFirst.field.1"]' '1: S'
     MixedHiddenFirst(#[doc(hidden)] H, /** dox */ S),
-    // @has - '//*[@id="variant.MixedHiddenLast"]//code' 'MixedHiddenLast(S, _)'
+    // @has - '//*[@id="variant.MixedHiddenLast"]//h3' 'MixedHiddenLast(S, _)'
     // @has - '//*[@id="variant.MixedHiddenLast.field.0"]' '0: S'
     // @count - '//*[@id="variant.MixedHiddenLast.field.1"]' 0
     MixedHiddenLast(/** dox */ S, #[doc(hidden)] H),
-    // @has - '//*[@id="variant.HiddenStruct"]//code' 'HiddenStruct'
+    // @has - '//*[@id="variant.HiddenStruct"]//h3' 'HiddenStruct'
     // @count - '//*[@id="variant.HiddenStruct.field.h"]' 0
     // @has - '//*[@id="variant.HiddenStruct.field.s"]' 's: S'
     HiddenStruct {

diff --git a/src/test/ui/array-slice-vec/slice_is_sorted_by_borrow.rs b/src/test/ui/array-slice-vec/slice_is_sorted_by_borrow.rs
@@ -0,0 +1,20 @@
+// check-pass
+// regression test for https://github.com/rust-lang/rust/issues/53485#issuecomment-885393452
+
+#![feature(is_sorted)]
+
+struct A {
+    name: String,
+}
+
+fn main() {
+    let a = &[
+        A {
+            name: "1".to_string(),
+        },
+        A {
+            name: "2".to_string(),
+        },
+    ];
+    assert!(a.is_sorted_by_key(|a| a.name.as_str()));
+}
diff --git a/src/test/ui/dyn-star/align.normal.stderr b/src/test/ui/dyn-star/align.normal.stderr
@@ -0,0 +1,11 @@
+warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/align.rs:4:12
+   |
+LL | #![feature(dyn_star)]
+   |            ^^^^^^^^
+   |
+   = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/dyn-star/align.over_aligned.stderr b/src/test/ui/dyn-star/align.over_aligned.stderr
@@ -0,0 +1,20 @@
+warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/align.rs:4:12
+   |
+LL | #![feature(dyn_star)]
+   |            ^^^^^^^^
+   |
+   = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0277]: `AlignedUsize` needs to be a pointer-sized type
+  --> $DIR/align.rs:15:13
+   |
+LL |     let x = AlignedUsize(12) as dyn* Debug;
+   |             ^^^^^^^^^^^^^^^^ `AlignedUsize` needs to be a pointer-sized type
+   |
+   = help: the trait `PointerSized` is not implemented for `AlignedUsize`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/dyn-star/align.rs b/src/test/ui/dyn-star/align.rs
@@ -0,0 +1,17 @@
+// revisions: normal over_aligned
+//[normal] check-pass
+
+#![feature(dyn_star)]
+//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+
+use std::fmt::Debug;
+
+#[cfg_attr(over_aligned,      repr(C, align(1024)))]
+#[cfg_attr(not(over_aligned), repr(C))]
+#[derive(Debug)]
+struct AlignedUsize(usize);
+
+fn main() {
+    let x = AlignedUsize(12) as dyn* Debug;
+    //[over_aligned]~^ ERROR `AlignedUsize` needs to be a pointer-sized type
+}
diff --git a/src/test/ui/dyn-star/check-size-at-cast-polymorphic-bad.rs b/src/test/ui/dyn-star/check-size-at-cast-polymorphic-bad.rs
@@ -0,0 +1,15 @@
+#![feature(dyn_star)]
+#![allow(incomplete_features)]
+
+use std::fmt::Debug;
+
+fn dyn_debug(_: (dyn* Debug + '_)) {
+
+}
+
+fn polymorphic<T: Debug + ?Sized>(t: &T) {
+    dyn_debug(t);
+    //~^ ERROR `&T` needs to be a pointer-sized type
+}
+
+fn main() {}
diff --git a/src/test/ui/dyn-star/check-size-at-cast-polymorphic-bad.stderr b/src/test/ui/dyn-star/check-size-at-cast-polymorphic-bad.stderr
@@ -0,0 +1,15 @@
+error[E0277]: `&T` needs to be a pointer-sized type
+  --> $DIR/check-size-at-cast-polymorphic-bad.rs:11:15
+   |
+LL |     dyn_debug(t);
+   |               ^ `&T` needs to be a pointer-sized type
+   |
+   = help: the trait `PointerSized` is not implemented for `&T`
+help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
+   |
+LL | fn polymorphic<T: Debug + ?Sized>(t: &T) where &T: PointerSized {
+   |                                          ++++++++++++++++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/dyn-star/check-size-at-cast-polymorphic.rs b/src/test/ui/dyn-star/check-size-at-cast-polymorphic.rs
@@ -0,0 +1,16 @@
+// check-pass
+
+#![feature(dyn_star)]
+#![allow(incomplete_features)]
+
+use std::fmt::Debug;
+
+fn dyn_debug(_: (dyn* Debug + '_)) {
+
+}
+
+fn polymorphic<T: Debug>(t: &T) {
+    dyn_debug(t);
+}
+
+fn main() {}
diff --git a/src/test/ui/dyn-star/check-size-at-cast.rs b/src/test/ui/dyn-star/check-size-at-cast.rs
@@ -0,0 +1,10 @@
+#![feature(dyn_star)]
+#![allow(incomplete_features)]
+
+use std::fmt::Debug;
+
+fn main() {
+    let i = [1, 2, 3, 4] as dyn* Debug;
+    //~^ ERROR `[i32; 4]` needs to be a pointer-sized type
+    dbg!(i);
+}
diff --git a/src/test/ui/dyn-star/check-size-at-cast.stderr b/src/test/ui/dyn-star/check-size-at-cast.stderr
@@ -0,0 +1,11 @@
+error[E0277]: `[i32; 4]` needs to be a pointer-sized type
+  --> $DIR/check-size-at-cast.rs:7:13
+   |
+LL |     let i = [1, 2, 3, 4] as dyn* Debug;
+   |             ^^^^^^^^^^^^ `[i32; 4]` needs to be a pointer-sized type
+   |
+   = help: the trait `PointerSized` is not implemented for `[i32; 4]`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
@@ -133,6 +133,11 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "hashbrown",
     "hermit-abi",
     "humantime",
+    "icu_list",
+    "icu_locid",
+    "icu_provider",
+    "icu_provider_adapters",
+    "icu_provider_macros",
     "if_chain",
     "indexmap",
     "instant",
@@ -145,6 +150,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "libc",
     "libloading",
     "libz-sys",
+    "litemap",
     "lock_api",
     "log",
     "matchers",
@@ -253,9 +259,16 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "winapi-i686-pc-windows-gnu",
     "winapi-util",
     "winapi-x86_64-pc-windows-gnu",
+    "writeable",
     // this is a false-positive: it's only used by rustfmt, but because it's enabled through a
     // feature, tidy thinks it's used by rustc as well.
     "yansi-term",
+    "yoke",
+    "yoke-derive",
+    "zerofrom",
+    "zerofrom-derive",
+    "zerovec",
+    "zerovec-derive",
 ];
 
 const PERMITTED_CRANELIFT_DEPENDENCIES: &[&str] = &[