Auto merge of #123725 - GuillaumeGomez:rollup-gk2bbrg, r=GuillaumeGomez

Rollup of 7 pull requests

Successful merges:

 - #118391 (Add `REDUNDANT_LIFETIMES` lint to detect lifetimes which are semantically redundant)
 - #123534 (Windows: set main thread name without re-encoding)
 - #123659 (Add support to intrinsics fallback body)
 - #123689 (Add const generics support for pattern types)
 - #123701 (Only assert for child/parent projection compatibility AFTER checking that theyre coming from the same place)
 - #123702 (Further cleanup cfgs in the UI test suite)
 - #123706 (rustdoc: reduce per-page HTML overhead)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -46,6 +46,7 @@ impl<'a, T: Clone + IntoDiagArg> IntoDiagArg for &'a T {
     }
 }
 
+#[macro_export]
 macro_rules! into_diag_arg_using_display {
     ($( $ty:ty ),+ $(,)?) => {
         $(

compiler/rustc_hir_analysis/messages.ftl

@@ -355,6 +355,9 @@ hir_analysis_pattern_type_wild_pat = "wildcard patterns are not permitted for pa
 hir_analysis_placeholder_not_allowed_item_signatures = the placeholder `_` is not allowed within types on item signatures for {$kind}
     .label = not allowed in type signatures
 
+hir_analysis_redundant_lifetime_args = unnecessary lifetime parameter `{$victim}`
+    .note = you can use the `{$candidate}` lifetime directly, in place of `{$victim}`
+
 hir_analysis_requires_note = the `{$trait_name}` impl for `{$ty}` requires that `{$error_predicate}`
 
 hir_analysis_return_type_notation_equality_bound =

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -8,11 +8,13 @@ use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
 use rustc_errors::{codes::*, pluralize, struct_span_code_err, Applicability, ErrorGuaranteed};
 use rustc_hir as hir;
+use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId};
 use rustc_hir::lang_items::LangItem;
 use rustc_hir::ItemKind;
 use rustc_infer::infer::outlives::env::OutlivesEnvironment;
 use rustc_infer::infer::{self, InferCtxt, TyCtxtInferExt};
+use rustc_macros::LintDiagnostic;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::trait_def::TraitSpecializationKind;
@@ -136,6 +138,8 @@ where
         infcx.implied_bounds_tys_compat(param_env, body_def_id, &assumed_wf_types, false);
     let outlives_env = OutlivesEnvironment::with_bounds(param_env, implied_bounds);
 
+    lint_redundant_lifetimes(tcx, body_def_id, &outlives_env);
+
     let errors = infcx.resolve_regions(&outlives_env);
     if errors.is_empty() {
         return Ok(());
@@ -2010,6 +2014,137 @@ fn check_mod_type_wf(tcx: TyCtxt<'_>, module: LocalModDefId) -> Result<(), Error
     res
 }
 
+fn lint_redundant_lifetimes<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    owner_id: LocalDefId,
+    outlives_env: &OutlivesEnvironment<'tcx>,
+) {
+    let def_kind = tcx.def_kind(owner_id);
+    match def_kind {
+        DefKind::Struct
+        | DefKind::Union
+        | DefKind::Enum
+        | DefKind::Trait
+        | DefKind::TraitAlias
+        | DefKind::Fn
+        | DefKind::Const
+        | DefKind::Impl { of_trait: _ } => {
+            // Proceed
+        }
+        DefKind::AssocFn | DefKind::AssocTy | DefKind::AssocConst => {
+            let parent_def_id = tcx.local_parent(owner_id);
+            if matches!(tcx.def_kind(parent_def_id), DefKind::Impl { of_trait: true }) {
+                // Don't check for redundant lifetimes for associated items of trait
+                // implementations, since the signature is required to be compatible
+                // with the trait, even if the implementation implies some lifetimes
+                // are redundant.
+                return;
+            }
+        }
+        DefKind::Mod
+        | DefKind::Variant
+        | DefKind::TyAlias
+        | DefKind::ForeignTy
+        | DefKind::TyParam
+        | DefKind::ConstParam
+        | DefKind::Static { .. }
+        | DefKind::Ctor(_, _)
+        | DefKind::Macro(_)
+        | DefKind::ExternCrate
+        | DefKind::Use
+        | DefKind::ForeignMod
+        | DefKind::AnonConst
+        | DefKind::InlineConst
+        | DefKind::OpaqueTy
+        | DefKind::Field
+        | DefKind::LifetimeParam
+        | DefKind::GlobalAsm
+        | DefKind::Closure => return,
+    }
+
+    // The ordering of this lifetime map is a bit subtle.
+    //
+    // Specifically, we want to find a "candidate" lifetime that precedes a "victim" lifetime,
+    // where we can prove that `'candidate = 'victim`.
+    //
+    // `'static` must come first in this list because we can never replace `'static` with
+    // something else, but if we find some lifetime `'a` where `'a = 'static`, we want to
+    // suggest replacing `'a` with `'static`.
+    let mut lifetimes = vec![tcx.lifetimes.re_static];
+    lifetimes.extend(
+        ty::GenericArgs::identity_for_item(tcx, owner_id).iter().filter_map(|arg| arg.as_region()),
+    );
+    // If we are in a function, add its late-bound lifetimes too.
+    if matches!(def_kind, DefKind::Fn | DefKind::AssocFn) {
+        for var in tcx.fn_sig(owner_id).instantiate_identity().bound_vars() {
+            let ty::BoundVariableKind::Region(kind) = var else { continue };
+            lifetimes.push(ty::Region::new_late_param(tcx, owner_id.to_def_id(), kind));
+        }
+    }
+    lifetimes.retain(|candidate| candidate.has_name());
+
+    // Keep track of lifetimes which have already been replaced with other lifetimes.
+    // This makes sure that if `'a = 'b = 'c`, we don't say `'c` should be replaced by
+    // both `'a` and `'b`.
+    let mut shadowed = FxHashSet::default();
+
+    for (idx, &candidate) in lifetimes.iter().enumerate() {
+        // Don't suggest removing a lifetime twice. We only need to check this
+        // here and not up in the `victim` loop because equality is transitive,
+        // so if A = C and B = C, then A must = B, so it'll be shadowed too in
+        // A's victim loop.
+        if shadowed.contains(&candidate) {
+            continue;
+        }
+
+        for &victim in &lifetimes[(idx + 1)..] {
+            // We should only have late-bound lifetimes of the `BrNamed` variety,
+            // since we get these signatures straight from `hir_lowering`. And any
+            // other regions (ReError/ReStatic/etc.) shouldn't matter, since we
+            // can't really suggest to remove them.
+            let (ty::ReEarlyParam(ty::EarlyParamRegion { def_id, .. })
+            | ty::ReLateParam(ty::LateParamRegion {
+                bound_region: ty::BoundRegionKind::BrNamed(def_id, _),
+                ..
+            })) = victim.kind()
+            else {
+                continue;
+            };
+
+            // Do not rename lifetimes not local to this item since they'll overlap
+            // with the lint running on the parent. We still want to consider parent
+            // lifetimes which make child lifetimes redundant, otherwise we would
+            // have truncated the `identity_for_item` args above.
+            if tcx.parent(def_id) != owner_id.to_def_id() {
+                continue;
+            }
+
+            // If `candidate <: victim` and `victim <: candidate`, then they're equal.
+            if outlives_env.free_region_map().sub_free_regions(tcx, candidate, victim)
+                && outlives_env.free_region_map().sub_free_regions(tcx, victim, candidate)
+            {
+                shadowed.insert(victim);
+                tcx.emit_node_span_lint(
+                    rustc_lint_defs::builtin::REDUNDANT_LIFETIMES,
+                    tcx.local_def_id_to_hir_id(def_id.expect_local()),
+                    tcx.def_span(def_id),
+                    RedundantLifetimeArgsLint { candidate, victim },
+                );
+            }
+        }
+    }
+}
+
+#[derive(LintDiagnostic)]
+#[diag(hir_analysis_redundant_lifetime_args)]
+#[note]
+struct RedundantLifetimeArgsLint<'tcx> {
+    /// The lifetime we have found to be redundant.
+    victim: ty::Region<'tcx>,
+    // The lifetime we can replace the victim with.
+    candidate: ty::Region<'tcx>,
+}
+
 pub fn provide(providers: &mut Providers) {
     *providers = Providers { check_mod_type_wf, check_well_formed, ..*providers };
 }

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -20,7 +20,6 @@ use rustc_middle::hir::nested_filter;
 use rustc_middle::middle::resolve_bound_vars::*;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, TyCtxt, TypeSuperVisitable, TypeVisitor};
-use rustc_session::lint;
 use rustc_span::def_id::DefId;
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::Span;
@@ -867,31 +866,6 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
             }) => {
                 self.visit_lifetime(lifetime);
                 walk_list!(self, visit_param_bound, bounds);
-
-                if lifetime.res != hir::LifetimeName::Static {
-                    for bound in bounds {
-                        let hir::GenericBound::Outlives(lt) = bound else {
-                            continue;
-                        };
-                        if lt.res != hir::LifetimeName::Static {
-                            continue;
-                        }
-                        self.insert_lifetime(lt, ResolvedArg::StaticLifetime);
-                        self.tcx.node_span_lint(
-                            lint::builtin::UNUSED_LIFETIMES,
-                            lifetime.hir_id,
-                            lifetime.ident.span,
-                            format!("unnecessary lifetime parameter `{}`", lifetime.ident),
-                            |lint| {
-                                let help = format!(
-                                    "you can use the `'static` lifetime directly, in place of `{}`",
-                                    lifetime.ident,
-                                );
-                                lint.help(help);
-                            },
-                        );
-                    }
-                }
             }
             &hir::WherePredicate::EqPredicate(hir::WhereEqPredicate { lhs_ty, rhs_ty, .. }) => {
                 self.visit_ty(lhs_ty);

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -2223,6 +2223,24 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                                         Err(LitToConstError::TypeError) => todo!(),
                                     }
                                 }
+
+                                hir::ExprKind::Path(hir::QPath::Resolved(
+                                    _,
+                                    &hir::Path {
+                                        res: Res::Def(DefKind::ConstParam, def_id), ..
+                                    },
+                                )) => {
+                                    let ty = tcx
+                                        .type_of(def_id)
+                                        .no_bound_vars()
+                                        .expect("const parameter types cannot be generic");
+                                    let item_def_id = tcx.parent(def_id);
+                                    let generics = tcx.generics_of(item_def_id);
+                                    let index = generics.param_def_id_to_index[&def_id];
+                                    let name = tcx.item_name(def_id);
+                                    ty::Const::new_param(tcx, ty::ParamConst::new(index, name), ty)
+                                }
+
                                 _ => {
                                     let err = tcx
                                         .dcx()

compiler/rustc_lint_defs/src/builtin.rs

@@ -79,6 +79,7 @@ declare_lint_pass! {
         PROC_MACRO_BACK_COMPAT,
         PROC_MACRO_DERIVE_RESOLUTION_FALLBACK,
         PUB_USE_OF_PRIVATE_EXTERN_CRATE,
+        REDUNDANT_LIFETIMES,
         REFINING_IMPL_TRAIT_INTERNAL,
         REFINING_IMPL_TRAIT_REACHABLE,
         RENAMED_AND_REMOVED_LINTS,
@@ -1707,6 +1708,33 @@ declare_lint! {
     "detects lifetime parameters that are never used"
 }
 
+declare_lint! {
+    /// The `redundant_lifetimes` lint detects lifetime parameters that are
+    /// redundant because they are equal to another named lifetime.
+    ///
+    /// ### Example
+    ///
+    /// ```rust,compile_fail
+    /// #[deny(redundant_lifetimes)]
+    ///
+    /// // `'a = 'static`, so all usages of `'a` can be replaced with `'static`
+    /// pub fn bar<'a: 'static>() {}
+    ///
+    /// // `'a = 'b`, so all usages of `'b` can be replaced with `'a`
+    /// pub fn bar<'a: 'b, 'b: 'a>() {}
+    /// ```
+    ///
+    /// {{produces}}
+    ///
+    /// ### Explanation
+    ///
+    /// Unused lifetime parameters may signal a mistake or unfinished code.
+    /// Consider removing the parameter.
+    pub REDUNDANT_LIFETIMES,
+    Allow,
+    "detects lifetime parameters that are redundant because they are equal to some other named lifetime"
+}
+
 declare_lint! {
     /// The `tyvar_behind_raw_pointer` lint detects raw pointer to an
     /// inference variable.

compiler/rustc_middle/src/ty/context.rs

@@ -757,7 +757,7 @@ pub struct GlobalCtxt<'tcx> {
 impl<'tcx> GlobalCtxt<'tcx> {
     /// Installs `self` in a `TyCtxt` and `ImplicitCtxt` for the duration of
     /// `f`.
-    pub fn enter<'a: 'tcx, F, R>(&'a self, f: F) -> R
+    pub fn enter<F, R>(&'tcx self, f: F) -> R
     where
         F: FnOnce(TyCtxt<'tcx>) -> R,
     {

compiler/rustc_middle/src/ty/diagnostics.rs

@@ -5,13 +5,13 @@ use std::fmt::Write;
 use std::ops::ControlFlow;
 
 use crate::ty::{
-    AliasTy, Const, ConstKind, FallibleTypeFolder, InferConst, InferTy, Opaque, PolyTraitPredicate,
+    self, AliasTy, Const, ConstKind, FallibleTypeFolder, InferConst, InferTy, Opaque,
-    Projection, Ty, TyCtxt, TypeFoldable, TypeSuperFoldable, TypeSuperVisitable, TypeVisitable,
+    PolyTraitPredicate, Projection, Ty, TyCtxt, TypeFoldable, TypeSuperFoldable,
-    TypeVisitor,
+    TypeSuperVisitable, TypeVisitable, TypeVisitor,
 };
 
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{Applicability, Diag, DiagArgValue, IntoDiagArg};
+use rustc_errors::{into_diag_arg_using_display, Applicability, Diag, DiagArgValue, IntoDiagArg};
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
@@ -19,10 +19,9 @@ use rustc_hir::{PredicateOrigin, WherePredicate};
 use rustc_span::{BytePos, Span};
 use rustc_type_ir::TyKind::*;
 
-impl<'tcx> IntoDiagArg for Ty<'tcx> {
+into_diag_arg_using_display! {
-    fn into_diag_arg(self) -> DiagArgValue {
+    Ty<'_>,
-        self.to_string().into_diag_arg()
+    ty::Region<'_>,
-    }
 }
 
 impl<'tcx> Ty<'tcx> {

compiler/rustc_mir_transform/src/coroutine/by_move_body.rs

@@ -154,6 +154,14 @@ impl<'tcx> MirPass<'tcx> for ByMoveBody {
             }) {
                 let (child_field_idx, child_capture) = child_captures.next().unwrap();
 
+                // This analysis only makes sense if the parent capture is a
+                // prefix of the child capture.
+                assert!(
+                    child_capture.place.projections.len() >= parent_capture.place.projections.len(),
+                    "parent capture ({parent_capture:#?}) expected to be prefix of \
+                    child capture ({child_capture:#?})"
+                );
+
                 // Store this set of additional projections (fields and derefs).
                 // We need to re-apply them later.
                 let child_precise_captures =
@@ -244,7 +252,6 @@ fn child_prefix_matches_parent_projections(
         bug!("expected capture to be an upvar");
     };
 
-    assert!(child_capture.place.projections.len() >= parent_capture.place.projections.len());
     parent_base.var_path.hir_id == child_base.var_path.hir_id
         && std::iter::zip(&child_capture.place.projections, &parent_capture.place.projections)
             .all(|(child, parent)| child.kind == parent.kind)

compiler/rustc_smir/src/rustc_smir/builder.rs

@@ -4,9 +4,10 @@
 //! monomorphic body using internal representation.
 //! After that, we convert the internal representation into a stable one.
 use crate::rustc_smir::{Stable, Tables};
+use rustc_hir::def::DefKind;
 use rustc_middle::mir;
 use rustc_middle::mir::visit::MutVisitor;
-use rustc_middle::ty::{self, GenericArgsRef, Ty, TyCtxt};
+use rustc_middle::ty::{self, TyCtxt};
 
 /// Builds a monomorphic body for a given instance.
 pub struct BodyBuilder<'tcx> {
@@ -16,46 +17,43 @@ pub struct BodyBuilder<'tcx> {
 
 impl<'tcx> BodyBuilder<'tcx> {
     pub fn new(tcx: TyCtxt<'tcx>, instance: ty::Instance<'tcx>) -> Self {
+        let instance = match instance.def {
+            // To get the fallback body of an intrinsic, we need to convert it to an item.
+            ty::InstanceDef::Intrinsic(def_id) => ty::Instance::new(def_id, instance.args),
+            _ => instance,
+        };
         BodyBuilder { tcx, instance }
     }
 
     /// Build a stable monomorphic body for a given instance based on the MIR body.
     ///
-    /// Note that we skip instantiation for static and constants. Trying to do so can cause ICE.
+    /// All constants are also evaluated.
-    ///
-    /// We do monomorphize non-generic functions to eval unevaluated constants.
     pub fn build(mut self, tables: &mut Tables<'tcx>) -> stable_mir::mir::Body {
-        let mut body = self.tcx.instance_mir(self.instance.def).clone();
+        let body = tables.tcx.instance_mir(self.instance.def).clone();
-        if self.tcx.def_kind(self.instance.def_id()).is_fn_like() || !self.instance.args.is_empty()
+        let mono_body = if !self.instance.args.is_empty()
+            // Without the `generic_const_exprs` feature gate, anon consts in signatures do not
+            // get generic parameters. Which is wrong, but also not a problem without
+            // generic_const_exprs
+            || self.tcx.def_kind(self.instance.def_id()) != DefKind::AnonConst
         {
-            self.visit_body(&mut body);
+            let mut mono_body = self.instance.instantiate_mir_and_normalize_erasing_regions(
-        }
+                tables.tcx,
-        body.stable(tables)
+                ty::ParamEnv::reveal_all(),
-    }
+                ty::EarlyBinder::bind(body),
-
+            );
-    fn monomorphize<T>(&self, value: T) -> T
+            self.visit_body(&mut mono_body);
-    where
+            mono_body
-        T: ty::TypeFoldable<TyCtxt<'tcx>>,
+        } else {
-    {
+            // Already monomorphic.
-        self.instance.instantiate_mir_and_normalize_erasing_regions(
+            body
-            self.tcx,
+        };
-            ty::ParamEnv::reveal_all(),
+        mono_body.stable(tables)
-            ty::EarlyBinder::bind(value),
-        )
     }
 }
 
 impl<'tcx> MutVisitor<'tcx> for BodyBuilder<'tcx> {
-    fn visit_ty_const(&mut self, ct: &mut ty::Const<'tcx>, _location: mir::Location) {
-        *ct = self.monomorphize(*ct);
-    }
-
-    fn visit_ty(&mut self, ty: &mut Ty<'tcx>, _: mir::visit::TyContext) {
-        *ty = self.monomorphize(*ty);
-    }
-
     fn visit_constant(&mut self, constant: &mut mir::ConstOperand<'tcx>, location: mir::Location) {
-        let const_ = self.monomorphize(constant.const_);
+        let const_ = constant.const_;
         let val = match const_.eval(self.tcx, ty::ParamEnv::reveal_all(), constant.span) {
             Ok(v) => v,
             Err(mir::interpret::ErrorHandled::Reported(..)) => return,
@@ -68,10 +66,6 @@ impl<'tcx> MutVisitor<'tcx> for BodyBuilder<'tcx> {
         self.super_constant(constant, location);
     }
 
-    fn visit_args(&mut self, args: &mut GenericArgsRef<'tcx>, _: mir::Location) {
-        *args = self.monomorphize(*args);
-    }
-
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }

compiler/rustc_ty_utils/src/layout.rs

@@ -133,10 +133,14 @@ fn layout_of_uncached<'tcx>(
                 ty::PatternKind::Range { start, end, include_end } => {
                     if let Abi::Scalar(scalar) | Abi::ScalarPair(scalar, _) = &mut layout.abi {
                         if let Some(start) = start {
-                            scalar.valid_range_mut().start = start.eval_bits(tcx, param_env);
+                            scalar.valid_range_mut().start = start
+                                .try_eval_bits(tcx, param_env)
+                                .ok_or_else(|| error(cx, LayoutError::Unknown(ty)))?;
                         }
                         if let Some(end) = end {
-                            let mut end = end.eval_bits(tcx, param_env);
+                            let mut end = end
+                                .try_eval_bits(tcx, param_env)
+                                .ok_or_else(|| error(cx, LayoutError::Unknown(ty)))?;
                             if !include_end {
                                 end = end.wrapping_sub(1);
                             }

compiler/stable_mir/src/mir/mono.rs

@@ -41,13 +41,22 @@ impl Instance {
         with(|cx| cx.instance_args(self.def))
     }
 
-    /// Get the body of an Instance. The body will be eagerly monomorphized.
+    /// Get the body of an Instance.
+    ///
+    /// The body will be eagerly monomorphized and all constants will already be evaluated.
+    ///
+    /// This method will return the intrinsic fallback body if one was defined.
     pub fn body(&self) -> Option<Body> {
         with(|context| context.instance_body(self.def))
     }
 
     /// Check whether this instance has a body available.
     ///
+    /// For intrinsics with fallback body, this will return `true`. It is up to the user to decide
+    /// whether to specialize the intrinsic or to use its fallback body.
+    ///
+    /// For more information on fallback body, see <https://github.com/rust-lang/rust/issues/93145>.
+    ///
     /// This call is much cheaper than `instance.body().is_some()`, since it doesn't try to build
     /// the StableMIR body.
     pub fn has_body(&self) -> bool {

library/std/src/sys/pal/windows/api.rs

@@ -34,6 +34,102 @@ use core::ptr::addr_of;
 
 use super::c;
 
+/// Creates a null-terminated UTF-16 string from a str.
+pub macro wide_str($str:literal) {{
+    const _: () = {
+        if core::slice::memchr::memchr(0, $str.as_bytes()).is_some() {
+            panic!("null terminated strings cannot contain interior nulls");
+        }
+    };
+    crate::sys::pal::windows::api::utf16!(concat!($str, '\0'))
+}}
+
+/// Creates a UTF-16 string from a str without null termination.
+pub macro utf16($str:expr) {{
+    const UTF8: &str = $str;
+    const UTF16_LEN: usize = crate::sys::pal::windows::api::utf16_len(UTF8);
+    const UTF16: [u16; UTF16_LEN] = crate::sys::pal::windows::api::to_utf16(UTF8);
+    &UTF16
+}}
+
+#[cfg(test)]
+mod tests;
+
+/// Gets the UTF-16 length of a UTF-8 string, for use in the wide_str macro.
+pub const fn utf16_len(s: &str) -> usize {
+    let s = s.as_bytes();
+    let mut i = 0;
+    let mut len = 0;
+    while i < s.len() {
+        // the length of a UTF-8 encoded code-point is given by the number of
+        // leading ones, except in the case of ASCII.
+        let utf8_len = match s[i].leading_ones() {
+            0 => 1,
+            n => n as usize,
+        };
+        i += utf8_len;
+        // Note that UTF-16 surrogates (U+D800 to U+DFFF) are not encodable as UTF-8,
+        // so (unlike with WTF-8) we don't have to worry about how they'll get re-encoded.
+        len += if utf8_len < 4 { 1 } else { 2 };
+    }
+    len
+}
+
+/// Const convert UTF-8 to UTF-16, for use in the wide_str macro.
+///
+/// Note that this is designed for use in const contexts so is not optimized.
+pub const fn to_utf16<const UTF16_LEN: usize>(s: &str) -> [u16; UTF16_LEN] {
+    let mut output = [0_u16; UTF16_LEN];
+    let mut pos = 0;
+    let s = s.as_bytes();
+    let mut i = 0;
+    while i < s.len() {
+        match s[i].leading_ones() {
+            // Decode UTF-8 based on its length.
+            // See https://en.wikipedia.org/wiki/UTF-8
+            0 => {
+                // ASCII is the same in both encodings
+                output[pos] = s[i] as u16;
+                i += 1;
+                pos += 1;
+            }
+            2 => {
+                // Bits: 110xxxxx 10xxxxxx
+                output[pos] = ((s[i] as u16 & 0b11111) << 6) | (s[i + 1] as u16 & 0b111111);
+                i += 2;
+                pos += 1;
+            }
+            3 => {
+                // Bits: 1110xxxx 10xxxxxx 10xxxxxx
+                output[pos] = ((s[i] as u16 & 0b1111) << 12)
+                    | ((s[i + 1] as u16 & 0b111111) << 6)
+                    | (s[i + 2] as u16 & 0b111111);
+                i += 3;
+                pos += 1;
+            }
+            4 => {
+                // Bits: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+                let mut c = ((s[i] as u32 & 0b111) << 18)
+                    | ((s[i + 1] as u32 & 0b111111) << 12)
+                    | ((s[i + 2] as u32 & 0b111111) << 6)
+                    | (s[i + 3] as u32 & 0b111111);
+                // re-encode as UTF-16 (see https://en.wikipedia.org/wiki/UTF-16)
+                // - Subtract 0x10000 from the code point
+                // - For the high surrogate, shift right by 10 then add 0xD800
+                // - For the low surrogate, take the low 10 bits then add 0xDC00
+                c -= 0x10000;
+                output[pos] = ((c >> 10) + 0xD800) as u16;
+                output[pos + 1] = ((c & 0b1111111111) + 0xDC00) as u16;
+                i += 4;
+                pos += 2;
+            }
+            // valid UTF-8 cannot have any other values
+            _ => unreachable!(),
+        }
+    }
+    output
+}
+
 /// Helper method for getting the size of `T` as a u32.
 /// Errors at compile time if the size would overflow.
 ///

library/std/src/sys/pal/windows/api/tests.rs

@@ -0,0 +1,16 @@
+use crate::sys::pal::windows::api::{utf16, wide_str};
+
+macro_rules! check_utf16 {
+    ($str:literal) => {{
+        assert!(wide_str!($str).iter().copied().eq($str.encode_utf16().chain([0])));
+        assert!(utf16!($str).iter().copied().eq($str.encode_utf16()));
+    }};
+}
+
+#[test]
+fn test_utf16_macros() {
+    check_utf16!("hello world");
+    check_utf16!("€4.50");
+    check_utf16!("𨉟呐㗂越");
+    check_utf16!("Pchnąć w tę łódź jeża lub ośm skrzyń fig");
+}

library/std/src/sys/pal/windows/mod.rs

@@ -5,6 +5,7 @@ use crate::io::ErrorKind;
 use crate::mem::MaybeUninit;
 use crate::os::windows::ffi::{OsStrExt, OsStringExt};
 use crate::path::PathBuf;
+use crate::sys::pal::windows::api::wide_str;
 use crate::time::Duration;
 
 pub use self::rand::hashmap_random_keys;
@@ -12,6 +13,8 @@ pub use self::rand::hashmap_random_keys;
 #[macro_use]
 pub mod compat;
 
+mod api;
+
 pub mod alloc;
 pub mod args;
 pub mod c;
@@ -41,8 +44,6 @@ cfg_if::cfg_if! {
     }
 }
 
-mod api;
-
 /// Map a Result<T, WinError> to io::Result<T>.
 trait IoResult<T> {
     fn io_result(self) -> crate::io::Result<T>;
@@ -60,7 +61,7 @@ pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) {
 
     // Normally, `thread::spawn` will call `Thread::set_name` but since this thread already
     // exists, we have to call it ourselves.
-    thread::Thread::set_name(&c"main");
+    thread::Thread::set_name_wide(wide_str!("main"));
 }
 
 // SAFETY: must be called only once during runtime cleanup.

library/std/src/sys/pal/windows/thread.rs

@@ -59,13 +59,17 @@ impl Thread {
     pub fn set_name(name: &CStr) {
         if let Ok(utf8) = name.to_str() {
             if let Ok(utf16) = to_u16s(utf8) {
-                unsafe {
+                Self::set_name_wide(&utf16)
-                    c::SetThreadDescription(c::GetCurrentThread(), utf16.as_ptr());
-                };
             };
         };
     }
 
+    pub fn set_name_wide(name: &[u16]) {
+        unsafe {
+            c::SetThreadDescription(c::GetCurrentThread(), name.as_ptr());
+        };
+    }
+
     pub fn join(self) {
         let rc = unsafe { c::WaitForSingleObject(self.handle.as_raw_handle(), c::INFINITE) };
         if rc == c::WAIT_FAILED {

src/librustdoc/html/render/context.rs

@@ -231,7 +231,7 @@ impl<'tcx> Context<'tcx> {
                 rust_logo: has_doc_flag(self.tcx(), LOCAL_CRATE.as_def_id(), sym::rust_logo),
             };
             let mut page_buffer = Buffer::html();
-            print_item(self, it, &mut page_buffer, &page);
+            print_item(self, it, &mut page_buffer);
             layout::render(
                 &clone_shared.layout,
                 &page,

src/librustdoc/html/render/print_item.rs

@@ -31,11 +31,10 @@ use crate::html::format::{
     display_fn, join_with_double_colon, print_abi_with_space, print_constness_with_space,
     print_where_clause, visibility_print_with_space, Buffer, Ending, PrintWithSpace,
 };
-use crate::html::layout::Page;
+use crate::html::highlight;
 use crate::html::markdown::{HeadingOffset, MarkdownSummaryLine};
 use crate::html::render::{document_full, document_item_info};
 use crate::html::url_parts_builder::UrlPartsBuilder;
-use crate::html::{highlight, static_files};
 
 use askama::Template;
 use itertools::Itertools;
@@ -157,8 +156,6 @@ struct PathComponent {
 #[derive(Template)]
 #[template(path = "print_item.html")]
 struct ItemVars<'a> {
-    static_root_path: &'a str,
-    clipboard_svg: &'static static_files::StaticFile,
     typ: &'a str,
     name: &'a str,
     item_type: &'a str,
@@ -178,12 +175,7 @@ fn print_where_clause_and_check<'a, 'tcx: 'a>(
     len_before != buffer.len()
 }
 
-pub(super) fn print_item(
+pub(super) fn print_item(cx: &mut Context<'_>, item: &clean::Item, buf: &mut Buffer) {
-    cx: &mut Context<'_>,
-    item: &clean::Item,
-    buf: &mut Buffer,
-    page: &Page<'_>,
-) {
     debug_assert!(!item.is_stripped());
     let typ = match *item.kind {
         clean::ModuleItem(_) => {
@@ -252,8 +244,6 @@ pub(super) fn print_item(
     };
 
     let item_vars = ItemVars {
-        static_root_path: &page.get_static_root_path(),
-        clipboard_svg: &static_files::STATIC_FILES.clipboard_svg,
         typ,
         name: item.name.as_ref().unwrap().as_str(),
         item_type: &item.type_().to_string(),
@@ -1237,22 +1227,18 @@ fn item_opaque_ty(
 }
 
 fn item_type_alias(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean::TypeAlias) {
-    fn write_content(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, t: &clean::TypeAlias) {
+    wrap_item(w, |w| {
-        wrap_item(w, |w| {
+        write!(
-            write!(
+            w,
-                w,
+            "{attrs}{vis}type {name}{generics}{where_clause} = {type_};",
-                "{attrs}{vis}type {name}{generics}{where_clause} = {type_};",
+            attrs = render_attributes_in_pre(it, "", cx),
-                attrs = render_attributes_in_pre(it, "", cx),
+            vis = visibility_print_with_space(it, cx),
-                vis = visibility_print_with_space(it, cx),
+            name = it.name.unwrap(),
-                name = it.name.unwrap(),
+            generics = t.generics.print(cx),
-                generics = t.generics.print(cx),
+            where_clause = print_where_clause(&t.generics, cx, 0, Ending::Newline),
-                where_clause = print_where_clause(&t.generics, cx, 0, Ending::Newline),
+            type_ = t.type_.print(cx),
-                type_ = t.type_.print(cx),
+        );
-            );
+    });
-        });
-    }
-
-    write_content(w, cx, it, t);
 
     write!(w, "{}", document(cx, it, None, HeadingOffset::H2));
 

src/librustdoc/html/static/css/rustdoc.css

@@ -1603,6 +1603,16 @@ a.tooltip:hover::after {
 	border-color: var(--settings-button-border-focus);
 }
 
+#settings-menu > a {
+	line-height: 0;
+	font-size: 0;
+}
+#settings-menu > a:before {
+	content: url('wheel-63255fc4502dca9a.svg');
+	width: 22px;
+	height: 22px;
+}
+
 #sidebar-button > a:before {
 	content: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 22" \
 		fill="none" stroke="black">\
@@ -1622,11 +1632,17 @@ a.tooltip:hover::after {
 	padding-left: 2px;
 	border: 0;
 	width: 33px;
+	line-height: 0;
+	font-size: 0;
 }
-#copy-path > img {
+
+#copy-path:before {
 	filter: var(--copy-path-img-filter);
+	content: url('clipboard-24048e6d87f63d07.svg');
+	width: 19px;
+	height: 18px;
 }
-#copy-path:hover > img {
+#copy-path:hover:before {
 	filter: var(--copy-path-img-hover-filter);
 }
 

src/librustdoc/html/static/images/clipboard.svg

@@ -1 +1 @@
-<svg width="24" height="25" viewBox="0 0 24 25" xmlns="http://www.w3.org/2000/svg" aria-label="Copy to clipboard"><path d="M18 20h2v3c0 1-1 2-2 2H2c-.998 0-2-1-2-2V5c0-.911.755-1.667 1.667-1.667h5A3.323 3.323 0 0110 0a3.323 3.323 0 013.333 3.333h5C19.245 3.333 20 4.09 20 5v8.333h-2V9H2v14h16v-3zM3 7h14c0-.911-.793-1.667-1.75-1.667H13.5c-.957 0-1.75-.755-1.75-1.666C11.75 2.755 10.957 2 10 2s-1.75.755-1.75 1.667c0 .911-.793 1.666-1.75 1.666H4.75C3.793 5.333 3 6.09 3 7z"/><path d="M4 19h6v2H4zM12 11H4v2h8zM4 17h4v-2H4zM15 15v-3l-4.5 4.5L15 21v-3l8.027-.032L23 15z"/></svg>
+<svg width="19" height="18" viewBox="0 0 24 25" xmlns="http://www.w3.org/2000/svg" aria-label="Copy to clipboard"><path d="M18 20h2v3c0 1-1 2-2 2H2c-.998 0-2-1-2-2V5c0-.911.755-1.667 1.667-1.667h5A3.323 3.323 0 0110 0a3.323 3.323 0 013.333 3.333h5C19.245 3.333 20 4.09 20 5v8.333h-2V9H2v14h16v-3zM3 7h14c0-.911-.793-1.667-1.75-1.667H13.5c-.957 0-1.75-.755-1.75-1.666C11.75 2.755 10.957 2 10 2s-1.75.755-1.75 1.667c0 .911-.793 1.666-1.75 1.666H4.75C3.793 5.333 3 6.09 3 7z"/><path d="M4 19h6v2H4zM12 11H4v2h8zM4 17h4v-2H4zM15 15v-3l-4.5 4.5L15 21v-3l8.027-.032L23 15z"/></svg>

src/librustdoc/html/static/images/wheel.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="27.434" height="29.5" enable-background="new 0 0 27.434 29.5" viewBox="0 0 27.434 29.5"><path d="M27.316 18.39a2.696 2.696 0 0 0-.98-1.46 1.62 1.62 0 0 1-.016-.762l.035-.176v-1.191c0-1.246-.003-1.278-.046-1.473a1.717 1.717 0 0 1 .007-.805c.477-.343.829-.859.997-1.472.257-.957.074-2.094-.508-3.117l-.594-1.032c-.746-1.304-1.965-2.117-3.18-2.117-.379 0-.75.078-1.086.235a1.958 1.958 0 0 1-.855-.391l-.102-.082-.117-.063-1.855-1.07-.094-.055-.106-.043c-.378-.156-.66-.41-.77-.554C17.919 1.172 16.349 0 14.297 0h-1.155c-2.043 0-3.61 1.152-3.75 2.723-.114.14-.391.382-.758.527l-.102.04-.094.05-1.94 1.066-.134.074-.117.094a2.019 2.019 0 0 1-.832.403 2.518 2.518 0 0 0-1.008-.211c-1.199 0-2.414.82-3.168 2.14l-.59 1.032c-.41.718-.64 1.523-.64 2.257-.004.953.36 1.758 1.012 2.258.035.152.058.445-.016.785-.04.168-.063.282-.063 1.563 0 1.148 0 1.148.016 1.261l.008.075.015.074c.075.344.047.64.012.8-.644.5-1.004 1.302-.992 2.259.008.726.238 1.52.648 2.242l.59 1.027c.758 1.332 1.965 2.16 3.149 2.16.324 0 .644-.062.937-.187.168.039.492.156.813.418l.11.086.124.07 2.047 1.156.102.059.105.043c.363.144.648.379.766.52.164 1.519 1.718 2.632 3.746 2.632h1.156c2.035 0 3.598-1.133 3.746-2.672.117-.144.402-.394.773-.55l.114-.047.101-.063 1.961-1.156.106-.063.097-.078c.309-.246.653-.37.832-.398.313.136.66.21 1.016.21 1.2 0 2.41-.82 3.164-2.14l.594-1.031c.59-1.028.777-2.164.52-3.117Zm-2.043 2.247-.59 1.031c-.437.766-1.105 1.25-1.636 1.25a.7.7 0 0 1-.371-.094 1.146 1.146 0 0 0-.567-.129c-.593 0-1.382.297-2.007.797l-1.961 1.156c-1.016.426-1.848 1.293-1.848 1.93 0 .64-.898 1.16-1.996 1.16H13.14c-1.102 0-2-.515-2-1.14 0-.63-.832-1.477-1.852-1.887l-2.047-1.16c-.637-.512-1.426-.813-2.008-.813-.199 0-.379.035-.515.114a.648.648 0 0 1-.332.085c-.52 0-1.18-.5-1.621-1.273l-.59-1.031c-.543-.953-.555-1.98-.024-2.285.532-.305.782-1.434.551-2.504V14.8c0-1.09.02-1.18.02-1.18.238-1.074-.008-2.203-.551-2.516-.54-.304-.54-1.34.008-2.293l.59-1.03c.437-.766 1.101-1.255 1.636-1.255a.73.73 0 0 1 .364.094c.152.086.343.125.566.125.594 0 1.379-.297 2.004-.793l1.945-1.066c1.02-.407 1.856-1.278 1.856-1.934 0-.656.898-1.191 2-1.191h1.156c1.098 0 1.996.543 1.996 1.21 0 .669.832 1.555 1.848 1.973L20 6.012c.617.492 1.402.777 2.012.777.242 0 .453-.047.62-.14a.79.79 0 0 1 .403-.102c.55 0 1.223.476 1.652 1.23l.59 1.032c.543.953.52 2.004-.062 2.336-.574.332-.86 1.48-.625 2.554 0 0 .008.04.008 1.102v1.011c-.215 1.051.07 2.176.636 2.5.567.325.586 1.368.04 2.325Zm0 0"/><path d="M13.61 7.61a7.084 7.084 0 0 0-7.083 7.085 7.085 7.085 0 1 0 14.168 0A7.088 7.088 0 0 0 13.61 7.61Zm0 12.41a5.33 5.33 0 0 1-5.325-5.325 5.33 5.33 0 0 1 5.324-5.32 5.327 5.327 0 0 1 5.325 5.32 5.328 5.328 0 0 1-5.325 5.325Zm0 0"/><path d="M13.684 9.906a4.722 4.722 0 0 0-4.72 4.719 4.722 4.722 0 0 0 4.72 4.719 4.724 4.724 0 0 0 4.714-4.719 4.724 4.724 0 0 0-4.714-4.719Zm0 7.676a2.954 2.954 0 1 1 0-5.91 2.953 2.953 0 0 1 2.953 2.953 2.957 2.957 0 0 1-2.953 2.957Zm0 0"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" enable-background="new 0 0 22 22" viewBox="0 0 27.434 29.5"><path d="M27.316 18.39a2.696 2.696 0 0 0-.98-1.46 1.62 1.62 0 0 1-.016-.762l.035-.176v-1.191c0-1.246-.003-1.278-.046-1.473a1.717 1.717 0 0 1 .007-.805c.477-.343.829-.859.997-1.472.257-.957.074-2.094-.508-3.117l-.594-1.032c-.746-1.304-1.965-2.117-3.18-2.117-.379 0-.75.078-1.086.235a1.958 1.958 0 0 1-.855-.391l-.102-.082-.117-.063-1.855-1.07-.094-.055-.106-.043c-.378-.156-.66-.41-.77-.554C17.919 1.172 16.349 0 14.297 0h-1.155c-2.043 0-3.61 1.152-3.75 2.723-.114.14-.391.382-.758.527l-.102.04-.094.05-1.94 1.066-.134.074-.117.094a2.019 2.019 0 0 1-.832.403 2.518 2.518 0 0 0-1.008-.211c-1.199 0-2.414.82-3.168 2.14l-.59 1.032c-.41.718-.64 1.523-.64 2.257-.004.953.36 1.758 1.012 2.258.035.152.058.445-.016.785-.04.168-.063.282-.063 1.563 0 1.148 0 1.148.016 1.261l.008.075.015.074c.075.344.047.64.012.8-.644.5-1.004 1.302-.992 2.259.008.726.238 1.52.648 2.242l.59 1.027c.758 1.332 1.965 2.16 3.149 2.16.324 0 .644-.062.937-.187.168.039.492.156.813.418l.11.086.124.07 2.047 1.156.102.059.105.043c.363.144.648.379.766.52.164 1.519 1.718 2.632 3.746 2.632h1.156c2.035 0 3.598-1.133 3.746-2.672.117-.144.402-.394.773-.55l.114-.047.101-.063 1.961-1.156.106-.063.097-.078c.309-.246.653-.37.832-.398.313.136.66.21 1.016.21 1.2 0 2.41-.82 3.164-2.14l.594-1.031c.59-1.028.777-2.164.52-3.117Zm-2.043 2.247-.59 1.031c-.437.766-1.105 1.25-1.636 1.25a.7.7 0 0 1-.371-.094 1.146 1.146 0 0 0-.567-.129c-.593 0-1.382.297-2.007.797l-1.961 1.156c-1.016.426-1.848 1.293-1.848 1.93 0 .64-.898 1.16-1.996 1.16H13.14c-1.102 0-2-.515-2-1.14 0-.63-.832-1.477-1.852-1.887l-2.047-1.16c-.637-.512-1.426-.813-2.008-.813-.199 0-.379.035-.515.114a.648.648 0 0 1-.332.085c-.52 0-1.18-.5-1.621-1.273l-.59-1.031c-.543-.953-.555-1.98-.024-2.285.532-.305.782-1.434.551-2.504V14.8c0-1.09.02-1.18.02-1.18.238-1.074-.008-2.203-.551-2.516-.54-.304-.54-1.34.008-2.293l.59-1.03c.437-.766 1.101-1.255 1.636-1.255a.73.73 0 0 1 .364.094c.152.086.343.125.566.125.594 0 1.379-.297 2.004-.793l1.945-1.066c1.02-.407 1.856-1.278 1.856-1.934 0-.656.898-1.191 2-1.191h1.156c1.098 0 1.996.543 1.996 1.21 0 .669.832 1.555 1.848 1.973L20 6.012c.617.492 1.402.777 2.012.777.242 0 .453-.047.62-.14a.79.79 0 0 1 .403-.102c.55 0 1.223.476 1.652 1.23l.59 1.032c.543.953.52 2.004-.062 2.336-.574.332-.86 1.48-.625 2.554 0 0 .008.04.008 1.102v1.011c-.215 1.051.07 2.176.636 2.5.567.325.586 1.368.04 2.325Zm0 0"/><path d="M13.61 7.61a7.084 7.084 0 0 0-7.083 7.085 7.085 7.085 0 1 0 14.168 0A7.088 7.088 0 0 0 13.61 7.61Zm0 12.41a5.33 5.33 0 0 1-5.325-5.325 5.33 5.33 0 0 1 5.324-5.32 5.327 5.327 0 0 1 5.325 5.32 5.328 5.328 0 0 1-5.325 5.325Zm0 0"/><path d="M13.684 9.906a4.722 4.722 0 0 0-4.72 4.719 4.722 4.722 0 0 0 4.72 4.719 4.724 4.724 0 0 0 4.714-4.719 4.724 4.724 0 0 0-4.714-4.719Zm0 7.676a2.954 2.954 0 1 1 0-5.91 2.953 2.953 0 0 1 2.953 2.953 2.957 2.957 0 0 1-2.953 2.957Zm0 0"/></svg>

src/librustdoc/html/static_files.rs

@@ -106,7 +106,6 @@ static_files! {
     license_mit => "static/LICENSE-MIT.txt",
     rust_logo_svg => "static/images/rust-logo.svg",
     rust_favicon_svg => "static/images/favicon.svg",
-    rust_favicon_png_16 => "static/images/favicon-16x16.png",
     rust_favicon_png_32 => "static/images/favicon-32x32.png",
     fira_sans_regular => "static/fonts/FiraSans-Regular.woff2",
     fira_sans_medium => "static/fonts/FiraSans-Medium.woff2",

src/librustdoc/html/templates/page.html

@@ -6,13 +6,10 @@
     <meta name="generator" content="rustdoc"> {# #}
     <meta name="description" content="{{page.description}}"> {# #}
     <title>{{page.title}}</title> {# #}
-    <script> if (window.location.protocol !== "file:") document.write(` {# Hack to skip preloading fonts locally - see #98769 #}
+    <script>if(window.location.protocol!=="file:") {# Hack to skip preloading fonts locally - see #98769 #}
-    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.source_serif_4_regular}}"> {# #}
+    for(f of "{{files.source_serif_4_regular}},{{files.fira_sans_regular}},{{files.fira_sans_medium}},{{files.source_code_pro_regular}},{{files.source_code_pro_semibold}}".split(",")) {# #}
-    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.fira_sans_regular}}"> {# #}
+     document.write(`<link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}${f}">`) {# #}
-    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.fira_sans_medium}}"> {# #}
+    </script> {# #}
-    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.source_code_pro_regular}}"> {# #}
-    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.source_code_pro_semibold}}"> {# #}
-    `)</script> {# #}
     <link rel="stylesheet" {#+ #}
           href="{{static_root_path|safe}}{{files.normalize_css}}"> {# #}
     <link rel="stylesheet" {#+ #}
@@ -61,8 +58,6 @@
     {% if !layout.favicon.is_empty() %}
         <link rel="icon" href="{{layout.favicon}}"> {# #}
     {% else %}
-        <link rel="alternate icon" type="image/png" {#+ #}
-            href="{{static_root_path|safe}}{{files.rust_favicon_png_16}}"> {# #}
         <link rel="alternate icon" type="image/png" {#+ #}
             href="{{static_root_path|safe}}{{files.rust_favicon_png_32}}"> {# #}
         <link rel="icon" type="image/svg+xml" {#+ #}
@@ -114,13 +109,13 @@
         <div class="version">{{+ display_krate_version_extra}}</div> {# #}
         {% endif %}
         {% else %}
-        <div class="src-sidebar-title">
+        <div class="src-sidebar-title"> {# #}
             <h2>Files</h2> {# #}
         </div> {# #}
         {% endif %}
         {{ sidebar|safe }}
     </nav> {# #}
-    <div class="sidebar-resizer"></div>
+    <div class="sidebar-resizer"></div> {# #}
     <main> {# #}
         {% if page.css_class != "src" %}<div class="width-limiter">{% endif %}
             <nav class="sub"> {# #}
@@ -142,8 +137,7 @@
                     </div> {# #}
                     <div id="settings-menu" tabindex="-1"> {# #}
                         <a href="{{page.root_path|safe}}settings.html" title="settings"> {# #}
-                            <img width="22" height="22" alt="Change settings" {#+ #}
+                            Settings {# #}
-                            src="{{static_root_path|safe}}{{files.wheel_svg}}"> {# #}
                         </a> {# #}
                     </div> {# #}
                 </form> {# #}

src/librustdoc/html/templates/print_item.html

@@ -7,9 +7,7 @@
         {% endfor %}
         <a class="{{item_type}}" href="#">{{name}}</a> {# #}
         <button id="copy-path" title="Copy item path to clipboard"> {# #}
-        <img src="{{static_root_path|safe}}{{clipboard_svg}}" {#+ #}
+            Copy item path {# #}
-                width="19" height="18" {#+ #}
-                alt="Copy item path"> {# #}
         </button> {# #}
     </h1> {# #}
     <span class="out-of-band">

src/librustdoc/html/templates/sidebar.html

@@ -5,7 +5,7 @@
 {% endif %}
 <div class="sidebar-elems">
     {% if is_crate %}
-        <ul class="block">
+        <ul class="block"> {# #}
             <li><a id="all-types" href="all.html">All Items</a></li> {# #}
         </ul>
     {% endif %}

tests/rustdoc-gui/search-result-go-to-first.goml

@@ -3,17 +3,17 @@
 // First, we check that the first page doesn't have the string we're looking for to ensure
 // that the feature is changing page as expected.
 go-to: "file://" + |DOC_PATH| + "/test_docs/index.html"
-assert-text-false: (".main-heading h1", "Struct test_docs::Foo")
+assert-text-false: (".main-heading h1", "Struct test_docs::FooCopy item path")
 
 // We now check that we land on the search result page if "go_to_first" isn't set.
 go-to: "file://" + |DOC_PATH| + "/test_docs/index.html?search=struct%3AFoo"
 // Waiting for the search results to appear...
 wait-for: "#search-tabs"
-assert-text-false: (".main-heading h1", "Struct test_docs::Foo")
+assert-text-false: (".main-heading h1", "Struct test_docs::FooCopy item path")
 // Ensure that the search results are displayed, not the "normal" content.
 assert-css: ("#main-content", {"display": "none"})
 
 // Now we can check that the feature is working as expected!
 go-to: "file://" + |DOC_PATH| + "/test_docs/index.html?search=struct%3AFoo&go_to_first=true"
 // Waiting for the page to load...
-wait-for-text: (".main-heading h1", "Struct test_docs::Foo")
+wait-for-text: (".main-heading h1", "Struct test_docs::FooCopy item path")

tests/rustdoc-gui/toggle-click-deadspace.goml

@@ -12,4 +12,4 @@ assert-attribute-false: (".impl-items .toggle", {"open": ""})
 
 // Click the "Trait" part of "impl Trait" and verify it navigates.
 click: "#impl-Trait-for-Foo h3 a:first-of-type"
-assert-text: (".main-heading h1", "Trait lib2::Trait")
+assert-text: (".main-heading h1", "Trait lib2::TraitCopy item path")

tests/ui-fulldeps/stable-mir/check_intrinsics.rs

@@ -0,0 +1,115 @@
+//@ run-pass
+//! Test information regarding intrinsics and ensure we can retrieve the fallback body if it exists.
+//!
+//! This tests relies on the intrinsics implementation, and requires one intrinsic with and one
+//! without a body. It doesn't matter which intrinsic is called here, and feel free to update that
+//! if needed.
+
+//@ ignore-stage1
+//@ ignore-cross-compile
+//@ ignore-remote
+//@ ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
+
+#![feature(rustc_private)]
+
+extern crate rustc_hir;
+#[macro_use]
+extern crate rustc_smir;
+extern crate rustc_driver;
+extern crate rustc_interface;
+extern crate stable_mir;
+
+use rustc_smir::rustc_internal;
+use stable_mir::mir::mono::{Instance, InstanceKind};
+use stable_mir::mir::visit::{Location, MirVisitor};
+use stable_mir::mir::{LocalDecl, Terminator, TerminatorKind};
+use stable_mir::ty::{RigidTy, TyKind};
+use std::collections::HashSet;
+use std::convert::TryFrom;
+use std::io::Write;
+use std::ops::ControlFlow;
+
+/// This function tests that we can correctly get type information from binary operations.
+fn test_intrinsics() -> ControlFlow<()> {
+    // Find items in the local crate.
+    let main_def = stable_mir::all_local_items()[0];
+    let main_instance = Instance::try_from(main_def).unwrap();
+    let main_body = main_instance.body().unwrap();
+    let mut visitor = CallsVisitor { locals: main_body.locals(), calls: Default::default() };
+    visitor.visit_body(&main_body);
+
+    let calls = visitor.calls;
+    assert_eq!(calls.len(), 2, "Expected 2 calls, but found: {calls:?}");
+    for intrinsic in &calls {
+        check_intrinsic(intrinsic)
+    }
+
+    ControlFlow::Continue(())
+}
+
+/// This check is unfortunately tight to the implementation of intrinsics.
+///
+/// We want to ensure that StableMIR can handle intrinsics with and without fallback body.
+///
+/// If by any chance this test breaks because you changed how an intrinsic is implemented, please
+/// update the test to invoke a different intrinsic.
+fn check_intrinsic(intrinsic: &Instance) {
+    assert_eq!(intrinsic.kind, InstanceKind::Intrinsic);
+    let name = intrinsic.intrinsic_name().unwrap();
+    if intrinsic.has_body() {
+        let Some(body) = intrinsic.body() else { unreachable!("Expected a body") };
+        assert!(!body.blocks.is_empty());
+        assert_eq!(&name, "likely");
+    } else {
+        assert!(intrinsic.body().is_none());
+        assert_eq!(&name, "size_of_val");
+    }
+}
+
+struct CallsVisitor<'a> {
+    locals: &'a [LocalDecl],
+    calls: HashSet<Instance>,
+}
+
+impl<'a> MirVisitor for CallsVisitor<'a> {
+    fn visit_terminator(&mut self, term: &Terminator, _loc: Location) {
+        match &term.kind {
+            TerminatorKind::Call { func, .. } => {
+                let TyKind::RigidTy(RigidTy::FnDef(def, args)) =
+                    func.ty(self.locals).unwrap().kind()
+                    else {
+                        return;
+                    };
+                self.calls.insert(Instance::resolve(def, &args).unwrap());
+            }
+            _ => {}
+        }
+    }
+}
+
+/// This test will generate and analyze a dummy crate using the stable mir.
+/// For that, it will first write the dummy crate into a file.
+/// Then it will create a `StableMir` using custom arguments and then
+/// it will run the compiler.
+fn main() {
+    let path = "binop_input.rs";
+    generate_input(&path).unwrap();
+    let args = vec!["rustc".to_string(), "--crate-type=lib".to_string(), path.to_string()];
+    run!(args, test_intrinsics).unwrap();
+}
+
+fn generate_input(path: &str) -> std::io::Result<()> {
+    let mut file = std::fs::File::create(path)?;
+    write!(
+        file,
+        r#"
+        #![feature(core_intrinsics)]
+        use std::intrinsics::*;
+        pub fn use_intrinsics(init: bool) -> bool {{
+            let sz = unsafe {{ size_of_val("hi") }};
+            likely(init && sz == 2)
+        }}
+        "#
+    )?;
+    Ok(())
+}

tests/ui/async-await/async-closures/different-projection-lengths-for-different-upvars.rs

@@ -0,0 +1,16 @@
+//@ check-pass
+//@ edition: 2021
+// issue: rust-lang/rust#123697
+
+#![feature(async_closure)]
+
+struct S { t: i32 }
+
+fn test(s: &S, t: &i32) {
+    async || {
+        println!("{}", s.t);
+        println!("{}", t);
+    };
+}
+
+fn main() {}

tests/ui/conditional-compilation/cfg-generic-params.rs

@@ -1,36 +1,36 @@
 //@ compile-flags:--cfg yes
 
-fn f_lt<#[cfg(yes)] 'a: 'a, #[cfg(no)] T>() {}
+fn f_lt<#[cfg(yes)] 'a: 'a, #[cfg(FALSE)] T>() {}
-fn f_ty<#[cfg(no)] 'a: 'a, #[cfg(yes)] T>() {}
+fn f_ty<#[cfg(FALSE)] 'a: 'a, #[cfg(yes)] T>() {}
 
-type FnGood = for<#[cfg(yes)] 'a, #[cfg(no)] T> fn(); // OK
+type FnGood = for<#[cfg(yes)] 'a, #[cfg(FALSE)] T> fn(); // OK
-type FnBad = for<#[cfg(no)] 'a, #[cfg(yes)] T> fn();
+type FnBad = for<#[cfg(FALSE)] 'a, #[cfg(yes)] T> fn();
 //~^ ERROR only lifetime parameters can be used in this context
 
-type PolyGood = dyn for<#[cfg(yes)] 'a, #[cfg(no)] T> Copy; // OK
+type PolyGood = dyn for<#[cfg(yes)] 'a, #[cfg(FALSE)] T> Copy; // OK
-type PolyBad = dyn for<#[cfg(no)] 'a, #[cfg(yes)] T> Copy;
+type PolyBad = dyn for<#[cfg(FALSE)] 'a, #[cfg(yes)] T> Copy;
 //~^ ERROR only lifetime parameters can be used in this context
 
-struct WhereGood where for<#[cfg(yes)] 'a, #[cfg(no)] T> u8: Copy; // OK
+struct WhereGood where for<#[cfg(yes)] 'a, #[cfg(FALSE)] T> u8: Copy; // OK
-struct WhereBad where for<#[cfg(no)] 'a, #[cfg(yes)] T> u8: Copy;
+struct WhereBad where for<#[cfg(FALSE)] 'a, #[cfg(yes)] T> u8: Copy;
 //~^ ERROR only lifetime parameters can be used in this context
 
-fn f_lt_no<#[cfg_attr(no, unknown)] 'a>() {} // OK
+fn f_lt_no<#[cfg_attr(FALSE, unknown)] 'a>() {} // OK
 fn f_lt_yes<#[cfg_attr(yes, unknown)] 'a>() {}
 //~^ ERROR cannot find attribute `unknown` in this scope
-fn f_ty_no<#[cfg_attr(no, unknown)] T>() {} // OK
+fn f_ty_no<#[cfg_attr(FALSE, unknown)] T>() {} // OK
 fn f_ty_yes<#[cfg_attr(yes, unknown)] T>() {}
 //~^ ERROR cannot find attribute `unknown` in this scope
 
-type FnNo = for<#[cfg_attr(no, unknown)] 'a> fn(); // OK
+type FnNo = for<#[cfg_attr(FALSE, unknown)] 'a> fn(); // OK
 type FnYes = for<#[cfg_attr(yes, unknown)] 'a> fn();
 //~^ ERROR cannot find attribute `unknown` in this scope
 
-type PolyNo = dyn for<#[cfg_attr(no, unknown)] 'a> Copy; // OK
+type PolyNo = dyn for<#[cfg_attr(FALSE, unknown)] 'a> Copy; // OK
 type PolyYes = dyn for<#[cfg_attr(yes, unknown)] 'a> Copy;
 //~^ ERROR cannot find attribute `unknown` in this scope
 
-struct WhereNo where for<#[cfg_attr(no, unknown)] 'a> u8: Copy; // OK
+struct WhereNo where for<#[cfg_attr(FALSE, unknown)] 'a> u8: Copy; // OK
 struct WhereYes where for<#[cfg_attr(yes, unknown)] 'a> u8: Copy;
 //~^ ERROR cannot find attribute `unknown` in this scope
 

tests/ui/conditional-compilation/cfg-generic-params.stderr

@@ -29,35 +29,35 @@ LL | struct WhereYes where for<#[cfg_attr(yes, unknown)] 'a> u8: Copy;
    |                                           ^^^^^^^
 
 error[E0658]: only lifetime parameters can be used in this context
-  --> $DIR/cfg-generic-params.rs:7:45
+  --> $DIR/cfg-generic-params.rs:7:48
    |
-LL | type FnBad = for<#[cfg(no)] 'a, #[cfg(yes)] T> fn();
+LL | type FnBad = for<#[cfg(FALSE)] 'a, #[cfg(yes)] T> fn();
-   |                                             ^
+   |                                                ^
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: only lifetime parameters can be used in this context
-  --> $DIR/cfg-generic-params.rs:11:51
+  --> $DIR/cfg-generic-params.rs:11:54
    |
-LL | type PolyBad = dyn for<#[cfg(no)] 'a, #[cfg(yes)] T> Copy;
+LL | type PolyBad = dyn for<#[cfg(FALSE)] 'a, #[cfg(yes)] T> Copy;
-   |                                                   ^
-   |
-   = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
-   = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: only lifetime parameters can be used in this context
-  --> $DIR/cfg-generic-params.rs:15:54
-   |
-LL | struct WhereBad where for<#[cfg(no)] 'a, #[cfg(yes)] T> u8: Copy;
    |                                                      ^
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
+error[E0658]: only lifetime parameters can be used in this context
+  --> $DIR/cfg-generic-params.rs:15:57
+   |
+LL | struct WhereBad where for<#[cfg(FALSE)] 'a, #[cfg(yes)] T> u8: Copy;
+   |                                                         ^
+   |
+   = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
+   = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+
 error: aborting due to 8 previous errors
 
 For more information about this error, try `rustc --explain E0658`.

tests/ui/const-generics/const-arg-in-const-arg.rs

@@ -2,8 +2,8 @@
 // we use a single revision because this should have a `full` revision
 // but right now that ICEs and I(@BoxyUwU) could not get stderr normalization to work
 
-#![cfg_attr(full, feature(generic_const_exprs))]
+// #![cfg_attr(full, feature(generic_const_exprs))]
-#![cfg_attr(full, allow(incomplete_features))]
+// #![cfg_attr(full, allow(incomplete_features))]
 
 const fn foo<T>() -> usize { std::mem::size_of::<T>() }
 const fn bar<const N: usize>() -> usize { N }

tests/ui/feature-gates/feature-gate-yeet_expr-in-cfg.rs

@@ -1,7 +1,7 @@
 //@ compile-flags: --edition 2021
 
 pub fn demo() -> Option<i32> {
-    #[cfg(nope)]
+    #[cfg(FALSE)]
     {
         do yeet //~ ERROR `do yeet` expression is experimental
     }
@@ -9,7 +9,7 @@ pub fn demo() -> Option<i32> {
     Some(1)
 }
 
-#[cfg(nope)]
+#[cfg(FALSE)]
 pub fn alternative() -> Result<(), String> {
     do yeet "hello"; //~ ERROR `do yeet` expression is experimental
 }

tests/ui/generic-associated-types/unsatisfied-item-lifetime-bound.rs

@@ -1,8 +1,7 @@
-#![warn(unused_lifetimes)]
+#![warn(unused_lifetimes, redundant_lifetimes)]
 
 pub trait X {
-    type Y<'a: 'static>;
+    type Y<'a: 'static>; //~ WARN unnecessary lifetime parameter `'a`
-    //~^ WARNING unnecessary lifetime parameter
 }
 
 impl X for () {

tests/ui/generic-associated-types/unsatisfied-item-lifetime-bound.stderr

@@ -1,18 +1,5 @@
-warning: unnecessary lifetime parameter `'a`
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:4:12
-   |
-LL |     type Y<'a: 'static>;
-   |            ^^
-   |
-   = help: you can use the `'static` lifetime directly, in place of `'a`
-note: the lint level is defined here
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:1:9
-   |
-LL | #![warn(unused_lifetimes)]
-   |         ^^^^^^^^^^^^^^^^
-
 error[E0478]: lifetime bound not satisfied
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:9:18
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:8:18
    |
 LL |     type Y<'a: 'static>;
    |     ------------------- definition of `Y` from trait
@@ -21,7 +8,7 @@ LL |     type Y<'a> = &'a ();
    |                  ^^^^^^
    |
 note: lifetime parameter instantiated with the lifetime `'a` as defined here
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:9:12
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:8:12
    |
 LL |     type Y<'a> = &'a ();
    |            ^^
@@ -32,44 +19,57 @@ LL |     type Y<'a> = &'a () where 'a: 'static;
    |                         +++++++++++++++++
 
 error[E0478]: lifetime bound not satisfied
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:14:8
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:13:8
    |
 LL |     f: <T as X>::Y<'a>,
    |        ^^^^^^^^^^^^^^^
    |
 note: lifetime parameter instantiated with the lifetime `'a` as defined here
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:13:10
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:12:10
    |
 LL | struct B<'a, T: for<'r> X<Y<'r> = &'r ()>> {
    |          ^^
    = note: but lifetime parameter must outlive the static lifetime
 
 error[E0478]: lifetime bound not satisfied
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:19:8
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:18:8
    |
 LL |     f: <T as X>::Y<'a>,
    |        ^^^^^^^^^^^^^^^
    |
 note: lifetime parameter instantiated with the lifetime `'a` as defined here
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:18:10
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:17:10
    |
 LL | struct C<'a, T: X> {
    |          ^^
    = note: but lifetime parameter must outlive the static lifetime
 
 error[E0478]: lifetime bound not satisfied
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:24:8
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:23:8
    |
 LL |     f: <() as X>::Y<'a>,
    |        ^^^^^^^^^^^^^^^^
    |
 note: lifetime parameter instantiated with the lifetime `'a` as defined here
-  --> $DIR/unsatisfied-item-lifetime-bound.rs:23:10
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:22:10
    |
 LL | struct D<'a> {
    |          ^^
    = note: but lifetime parameter must outlive the static lifetime
 
+warning: unnecessary lifetime parameter `'a`
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:4:12
+   |
+LL |     type Y<'a: 'static>;
+   |            ^^
+   |
+   = note: you can use the `'static` lifetime directly, in place of `'a`
+note: the lint level is defined here
+  --> $DIR/unsatisfied-item-lifetime-bound.rs:1:27
+   |
+LL | #![warn(unused_lifetimes, redundant_lifetimes)]
+   |                           ^^^^^^^^^^^^^^^^^^^
+
 error: aborting due to 4 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0478`.

tests/ui/proc-macro/derive-helper-configured.rs

@@ -1,17 +1,15 @@
 // Derive helpers are resolved successfully inside `cfg_attr`.
 
 //@ check-pass
-// compile-flats:--cfg TRUE
 //@ aux-build:test-macros.rs
 
 #[macro_use]
 extern crate test_macros;
 
-#[cfg_attr(TRUE, empty_helper)]
 #[derive(Empty)]
-#[cfg_attr(TRUE, empty_helper)]
+#[cfg_attr(all(), empty_helper)]
 struct S {
-    #[cfg_attr(TRUE, empty_helper)]
+    #[cfg_attr(all(), empty_helper)]
     field: u8,
 }
 

tests/ui/regions/regions-free-region-outlives-static-outlives-free-region.rs

@@ -8,10 +8,10 @@
 //
 //     'a : 'b
 
-#![warn(unused_lifetimes)]
+#![warn(redundant_lifetimes)]
 
-fn test<'a,'b>(x: &'a i32) -> &'b i32
+fn test<'a,'b>(x: &'a i32) -> &'b i32 //~ WARN unnecessary lifetime parameter `'a`
-    where 'a: 'static //~ WARN unnecessary lifetime parameter `'a`
+    where 'a: 'static
 {
     x
 }

tests/ui/regions/regions-free-region-outlives-static-outlives-free-region.stderr

@@ -1,15 +1,15 @@
 warning: unnecessary lifetime parameter `'a`
-  --> $DIR/regions-free-region-outlives-static-outlives-free-region.rs:14:11
+  --> $DIR/regions-free-region-outlives-static-outlives-free-region.rs:13:9
    |
-LL |     where 'a: 'static
+LL | fn test<'a,'b>(x: &'a i32) -> &'b i32
-   |           ^^
+   |         ^^
    |
-   = help: you can use the `'static` lifetime directly, in place of `'a`
+   = note: you can use the `'static` lifetime directly, in place of `'a`
 note: the lint level is defined here
   --> $DIR/regions-free-region-outlives-static-outlives-free-region.rs:11:9
    |
-LL | #![warn(unused_lifetimes)]
+LL | #![warn(redundant_lifetimes)]
-   |         ^^^^^^^^^^^^^^^^
+   |         ^^^^^^^^^^^^^^^^^^^
 
 warning: 1 warning emitted
 

tests/ui/regions/regions-static-bound-rpass.rs

@@ -1,18 +1,19 @@
 //@ run-pass
 
-#![warn(unused_lifetimes)]
+#![warn(redundant_lifetimes)]
 
 fn invariant_id<'a,'b>(t: &'b mut &'static ()) -> &'b mut &'a ()
-    where 'a: 'static { t }
 //~^ WARN unnecessary lifetime parameter `'a`
+    where 'a: 'static { t }
 
 fn static_id<'a>(t: &'a ()) -> &'static ()
-    where 'a: 'static { t }
 //~^ WARN unnecessary lifetime parameter `'a`
+    where 'a: 'static { t }
 
 fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
+//~^ WARN unnecessary lifetime parameter `'a`
+//~| WARN unnecessary lifetime parameter `'b`
     where 'a: 'b, 'b: 'static { t }
-//~^ WARN unnecessary lifetime parameter `'b`
 
 fn ref_id<'a>(t: &'a ()) -> &'a () where 'static: 'a { t }
 

tests/ui/regions/regions-static-bound-rpass.stderr

@@ -1,31 +1,39 @@
 warning: unnecessary lifetime parameter `'a`
-  --> $DIR/regions-static-bound-rpass.rs:6:11
+  --> $DIR/regions-static-bound-rpass.rs:5:17
    |
-LL |     where 'a: 'static { t }
+LL | fn invariant_id<'a,'b>(t: &'b mut &'static ()) -> &'b mut &'a ()
-   |           ^^
+   |                 ^^
    |
-   = help: you can use the `'static` lifetime directly, in place of `'a`
+   = note: you can use the `'static` lifetime directly, in place of `'a`
 note: the lint level is defined here
   --> $DIR/regions-static-bound-rpass.rs:3:9
    |
-LL | #![warn(unused_lifetimes)]
+LL | #![warn(redundant_lifetimes)]
-   |         ^^^^^^^^^^^^^^^^
+   |         ^^^^^^^^^^^^^^^^^^^
 
 warning: unnecessary lifetime parameter `'a`
-  --> $DIR/regions-static-bound-rpass.rs:10:11
+  --> $DIR/regions-static-bound-rpass.rs:9:14
    |
-LL |     where 'a: 'static { t }
+LL | fn static_id<'a>(t: &'a ()) -> &'static ()
-   |           ^^
+   |              ^^
    |
-   = help: you can use the `'static` lifetime directly, in place of `'a`
+   = note: you can use the `'static` lifetime directly, in place of `'a`
+
+warning: unnecessary lifetime parameter `'a`
+  --> $DIR/regions-static-bound-rpass.rs:13:23
+   |
+LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
+   |                       ^^
+   |
+   = note: you can use the `'static` lifetime directly, in place of `'a`
 
 warning: unnecessary lifetime parameter `'b`
-  --> $DIR/regions-static-bound-rpass.rs:14:19
+  --> $DIR/regions-static-bound-rpass.rs:13:26
    |
-LL |     where 'a: 'b, 'b: 'static { t }
+LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
-   |                   ^^
+   |                          ^^
    |
-   = help: you can use the `'static` lifetime directly, in place of `'b`
+   = note: you can use the `'static` lifetime directly, in place of `'b`
 
-warning: 3 warnings emitted
+warning: 4 warnings emitted
 

tests/ui/regions/regions-static-bound.rs

@@ -1,12 +1,13 @@
-#![warn(unused_lifetimes)]
+#![warn(unused_lifetimes, redundant_lifetimes)]
 
 fn static_id<'a,'b>(t: &'a ()) -> &'static () where 'a: 'static { t }
-//~^ WARN lifetime parameter `'b` never used
+//~^ WARN unnecessary lifetime parameter `'a`
-//~| WARN unnecessary lifetime parameter `'a`
+//~| WARN lifetime parameter `'b` never used
 
 fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
+//~^ WARN unnecessary lifetime parameter `'a`
+//~| WARN unnecessary lifetime parameter `'b`
     where 'a: 'b, 'b: 'static { t }
-//~^ WARN unnecessary lifetime parameter `'b`
 
 fn static_id_wrong_way<'a>(t: &'a ()) -> &'static () where 'static: 'a {
     t

tests/ui/regions/regions-static-bound.stderr

@@ -9,27 +9,40 @@ LL | fn static_id<'a,'b>(t: &'a ()) -> &'static () where 'a: 'static { t }
 note: the lint level is defined here
   --> $DIR/regions-static-bound.rs:1:9
    |
-LL | #![warn(unused_lifetimes)]
+LL | #![warn(unused_lifetimes, redundant_lifetimes)]
    |         ^^^^^^^^^^^^^^^^
 
 warning: unnecessary lifetime parameter `'a`
-  --> $DIR/regions-static-bound.rs:3:53
+  --> $DIR/regions-static-bound.rs:3:14
    |
 LL | fn static_id<'a,'b>(t: &'a ()) -> &'static () where 'a: 'static { t }
-   |                                                     ^^
+   |              ^^
    |
-   = help: you can use the `'static` lifetime directly, in place of `'a`
+   = note: you can use the `'static` lifetime directly, in place of `'a`
+note: the lint level is defined here
+  --> $DIR/regions-static-bound.rs:1:27
+   |
+LL | #![warn(unused_lifetimes, redundant_lifetimes)]
+   |                           ^^^^^^^^^^^^^^^^^^^
+
+warning: unnecessary lifetime parameter `'a`
+  --> $DIR/regions-static-bound.rs:7:23
+   |
+LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
+   |                       ^^
+   |
+   = note: you can use the `'static` lifetime directly, in place of `'a`
 
 warning: unnecessary lifetime parameter `'b`
-  --> $DIR/regions-static-bound.rs:8:19
+  --> $DIR/regions-static-bound.rs:7:26
    |
-LL |     where 'a: 'b, 'b: 'static { t }
+LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
-   |                   ^^
+   |                          ^^
    |
-   = help: you can use the `'static` lifetime directly, in place of `'b`
+   = note: you can use the `'static` lifetime directly, in place of `'b`
 
 error: lifetime may not live long enough
-  --> $DIR/regions-static-bound.rs:12:5
+  --> $DIR/regions-static-bound.rs:13:5
    |
 LL | fn static_id_wrong_way<'a>(t: &'a ()) -> &'static () where 'static: 'a {
    |                        -- lifetime `'a` defined here
@@ -37,7 +50,7 @@ LL |     t
    |     ^ returning this value requires that `'a` must outlive `'static`
 
 error[E0521]: borrowed data escapes outside of function
-  --> $DIR/regions-static-bound.rs:17:5
+  --> $DIR/regions-static-bound.rs:18:5
    |
 LL | fn error(u: &(), v: &()) {
    |          -  - let's call the lifetime of this reference `'1`
@@ -50,7 +63,7 @@ LL |     static_id(&u);
    |     argument requires that `'1` must outlive `'static`
 
 error[E0521]: borrowed data escapes outside of function
-  --> $DIR/regions-static-bound.rs:19:5
+  --> $DIR/regions-static-bound.rs:20:5
    |
 LL | fn error(u: &(), v: &()) {
    |                  -  - let's call the lifetime of this reference `'2`
@@ -63,6 +76,6 @@ LL |     static_id_indirect(&v);
    |     `v` escapes the function body here
    |     argument requires that `'2` must outlive `'static`
 
-error: aborting due to 3 previous errors; 3 warnings emitted
+error: aborting due to 3 previous errors; 4 warnings emitted
 
 For more information about this error, try `rustc --explain E0521`.

tests/ui/regions/transitively-redundant-lifetimes.rs

@@ -0,0 +1,20 @@
+#![deny(redundant_lifetimes)]
+
+fn a<'a, 'b>(x: &'a &'b &'a ()) {} //~ ERROR unnecessary lifetime parameter `'b`
+
+fn b<'a: 'b, 'b: 'a>() {} //~ ERROR unnecessary lifetime parameter `'b`
+
+struct Foo<T: 'static>(T);
+fn c<'a>(_: Foo<&'a ()>) {} //~ ERROR unnecessary lifetime parameter `'a`
+
+struct Bar<'a>(&'a ());
+impl<'a> Bar<'a> {
+    fn d<'b: 'a>(&'b self) {} //~ ERROR unnecessary lifetime parameter `'b`
+}
+
+fn ok(x: &'static &()) {}
+
+trait Tr<'a> {}
+impl<'a: 'static> Tr<'a> for () {} //~ ERROR unnecessary lifetime parameter `'a`
+
+fn main() {}

tests/ui/regions/transitively-redundant-lifetimes.stderr

@@ -0,0 +1,47 @@
+error: unnecessary lifetime parameter `'b`
+  --> $DIR/transitively-redundant-lifetimes.rs:3:10
+   |
+LL | fn a<'a, 'b>(x: &'a &'b &'a ()) {}
+   |          ^^
+   |
+   = note: you can use the `'a` lifetime directly, in place of `'b`
+note: the lint level is defined here
+  --> $DIR/transitively-redundant-lifetimes.rs:1:9
+   |
+LL | #![deny(redundant_lifetimes)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: unnecessary lifetime parameter `'b`
+  --> $DIR/transitively-redundant-lifetimes.rs:5:14
+   |
+LL | fn b<'a: 'b, 'b: 'a>() {}
+   |              ^^
+   |
+   = note: you can use the `'a` lifetime directly, in place of `'b`
+
+error: unnecessary lifetime parameter `'a`
+  --> $DIR/transitively-redundant-lifetimes.rs:8:6
+   |
+LL | fn c<'a>(_: Foo<&'a ()>) {}
+   |      ^^
+   |
+   = note: you can use the `'static` lifetime directly, in place of `'a`
+
+error: unnecessary lifetime parameter `'a`
+  --> $DIR/transitively-redundant-lifetimes.rs:18:6
+   |
+LL | impl<'a: 'static> Tr<'a> for () {}
+   |      ^^
+   |
+   = note: you can use the `'static` lifetime directly, in place of `'a`
+
+error: unnecessary lifetime parameter `'b`
+  --> $DIR/transitively-redundant-lifetimes.rs:12:10
+   |
+LL |     fn d<'b: 'a>(&'b self) {}
+   |          ^^
+   |
+   = note: you can use the `'a` lifetime directly, in place of `'b`
+
+error: aborting due to 5 previous errors
+

tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop-fail-2.rs

@@ -1,7 +1,7 @@
 //@ known-bug: #110395
 #![feature(const_trait_impl)]
 #![feature(const_mut_refs)]
-#![cfg_attr(precise, feature(const_precise_live_drops))]
+// #![cfg_attr(precise, feature(const_precise_live_drops))]
 
 use std::marker::{Destruct, PhantomData};
 

tests/ui/rust-2018/issue-54400-unused-extern-crate-attr-span.fixed

@@ -1,6 +1,6 @@
 //@ aux-build:edition-lint-paths.rs
 //@ run-rustfix
-//@ compile-flags:--extern edition_lint_paths --cfg blandiloquence
+//@ compile-flags:--extern edition_lint_paths
 //@ edition:2018
 
 #![deny(rust_2018_idioms)]

tests/ui/rust-2018/issue-54400-unused-extern-crate-attr-span.rs

@@ -1,6 +1,6 @@
 //@ aux-build:edition-lint-paths.rs
 //@ run-rustfix
-//@ compile-flags:--extern edition_lint_paths --cfg blandiloquence
+//@ compile-flags:--extern edition_lint_paths
 //@ edition:2018
 
 #![deny(rust_2018_idioms)]
@@ -8,7 +8,7 @@
 
 // The suggestion span should include the attribute.
 
-#[cfg(blandiloquence)] //~ HELP remove it
+#[cfg(not(FALSE))] //~ HELP remove it
 extern crate edition_lint_paths;
 //~^ ERROR unused extern crate
 

tests/ui/rust-2018/issue-54400-unused-extern-crate-attr-span.stderr

@@ -1,7 +1,7 @@
 error: unused extern crate
   --> $DIR/issue-54400-unused-extern-crate-attr-span.rs:12:1
    |
-LL | / #[cfg(blandiloquence)]
+LL | / #[cfg(not(FALSE))]
 LL | | extern crate edition_lint_paths;
    | | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
    | |________________________________|

tests/ui/type/pattern_types/const_generics.rs

@@ -0,0 +1,13 @@
+//@ check-pass
+
+#![feature(pattern_types)]
+#![feature(core_pattern_types)]
+#![feature(core_pattern_type)]
+
+use std::pat::pattern_type;
+
+trait Foo {}
+
+impl<const START: u32, const END: u32> Foo for pattern_type!(u32 is START..=END) {}
+
+fn main() {}