Auto merge of #102975 - Dylan-DPC:rollup-vzuwsh2, r=Dylan-DPC

Rollup of 7 pull requests

Successful merges:

 - #102623 (translation: eager translation)
 - #102719 (Enforce alphabetical sorting with tidy)
 - #102830 (Unify `tcx.constness` query and param env constness checks)
 - #102883 (Fix stabilization of `feature(half_open_range_patterns)`)
 - #102927 (Fix `let` keyword removal suggestion in structs)
 - #102936 (rustdoc: remove unused CSS `nav.sum`)
 - #102940 (Update books)

Failed merges:

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

Author: bors

Diff for: compiler/rustc_ast/src/ast.rs

@@ -3039,7 +3039,7 @@ pub type ForeignItem = Item<ForeignItemKind>;
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
-    // These are in alphabetical order, which is easy to maintain.
+    // tidy-alphabetical-start
     static_assert_size!(AssocItem, 104);
     static_assert_size!(AssocItemKind, 32);
     static_assert_size!(Attribute, 32);
@@ -3060,11 +3060,12 @@ mod size_asserts {
     static_assert_size!(Local, 72);
     static_assert_size!(Param, 40);
     static_assert_size!(Pat, 120);
-    static_assert_size!(PatKind, 96);
     static_assert_size!(Path, 40);
     static_assert_size!(PathSegment, 24);
+    static_assert_size!(PatKind, 96);
     static_assert_size!(Stmt, 32);
     static_assert_size!(StmtKind, 16);
     static_assert_size!(Ty, 96);
     static_assert_size!(TyKind, 72);
+    // tidy-alphabetical-end
 }

Diff for: compiler/rustc_ast/src/token.rs

@@ -889,10 +889,11 @@ where
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
-    // These are in alphabetical order, which is easy to maintain.
+    // tidy-alphabetical-start
     static_assert_size!(Lit, 12);
     static_assert_size!(LitKind, 2);
     static_assert_size!(Nonterminal, 16);
     static_assert_size!(Token, 24);
     static_assert_size!(TokenKind, 16);
+    // tidy-alphabetical-end
 }

Diff for: compiler/rustc_ast/src/tokenstream.rs

@@ -646,10 +646,11 @@ impl DelimSpan {
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
-    // These are in alphabetical order, which is easy to maintain.
+    // tidy-alphabetical-start
     static_assert_size!(AttrTokenStream, 8);
     static_assert_size!(AttrTokenTree, 32);
     static_assert_size!(LazyAttrTokenStream, 8);
     static_assert_size!(TokenStream, 8);
     static_assert_size!(TokenTree, 32);
+    // tidy-alphabetical-end
 }

Diff for: compiler/rustc_ast_lowering/src/errors.rs

@@ -1,4 +1,7 @@
-use rustc_errors::{fluent, AddToDiagnostic, Applicability, Diagnostic, DiagnosticArgFromDisplay};
+use rustc_errors::{
+    fluent, AddToDiagnostic, Applicability, Diagnostic, DiagnosticArgFromDisplay,
+    SubdiagnosticMessage,
+};
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{symbol::Ident, Span, Symbol};
 
@@ -19,7 +22,10 @@ pub struct UseAngleBrackets {
 }
 
 impl AddToDiagnostic for UseAngleBrackets {
-    fn add_to_diagnostic(self, diag: &mut Diagnostic) {
+    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
+    where
+        F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
+    {
         diag.multipart_suggestion(
             fluent::ast_lowering::use_angle_brackets,
             vec![(self.open_param, String::from("<")), (self.close_param, String::from(">"))],
@@ -69,7 +75,10 @@ pub enum AssocTyParenthesesSub {
 }
 
 impl AddToDiagnostic for AssocTyParenthesesSub {
-    fn add_to_diagnostic(self, diag: &mut Diagnostic) {
+    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
+    where
+        F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
+    {
         match self {
             Self::Empty { parentheses_span } => diag.multipart_suggestion(
                 fluent::ast_lowering::remove_parentheses,

Diff for: compiler/rustc_ast_passes/src/errors.rs

@@ -1,6 +1,6 @@
 //! Errors emitted by ast_passes.
 
-use rustc_errors::{fluent, AddToDiagnostic, Applicability, Diagnostic};
+use rustc_errors::{fluent, AddToDiagnostic, Applicability, Diagnostic, SubdiagnosticMessage};
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{Span, Symbol};
 
@@ -17,7 +17,10 @@ pub struct ForbiddenLet {
 }
 
 impl AddToDiagnostic for ForbiddenLetReason {
-    fn add_to_diagnostic(self, diag: &mut Diagnostic) {
+    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
+    where
+        F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
+    {
         match self {
             Self::GenericForbidden => {}
             Self::NotSupportedOr(span) => {
@@ -228,7 +231,10 @@ pub struct ExternBlockSuggestion {
 }
 
 impl AddToDiagnostic for ExternBlockSuggestion {
-    fn add_to_diagnostic(self, diag: &mut Diagnostic) {
+    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
+    where
+        F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
+    {
         let start_suggestion = if let Some(abi) = self.abi {
             format!("extern \"{}\" {{", abi)
         } else {

Diff for: compiler/rustc_codegen_ssa/src/back/write.rs

@@ -15,7 +15,10 @@ use rustc_data_structures::profiling::TimingGuard;
 use rustc_data_structures::profiling::VerboseTimingGuard;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::Emitter;
-use rustc_errors::{translation::Translate, DiagnosticId, FatalError, Handler, Level};
+use rustc_errors::{
+    translation::{to_fluent_args, Translate},
+    DiagnosticId, FatalError, Handler, Level,
+};
 use rustc_fs_util::link_or_copy;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc_incremental::{
@@ -1740,7 +1743,7 @@ impl Translate for SharedEmitter {
 
 impl Emitter for SharedEmitter {
     fn emit_diagnostic(&mut self, diag: &rustc_errors::Diagnostic) {
-        let fluent_args = self.to_fluent_args(diag.args());
+        let fluent_args = to_fluent_args(diag.args());
         drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
             msg: self.translate_messages(&diag.message, &fluent_args).to_string(),
             code: diag.code.clone(),

Diff for: compiler/rustc_const_eval/src/const_eval/fn_queries.rs

@@ -25,12 +25,10 @@ pub fn is_parent_const_impl_raw(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
 /// report whether said intrinsic has a `rustc_const_{un,}stable` attribute. Otherwise, return
 /// `Constness::NotConst`.
 fn constness(tcx: TyCtxt<'_>, def_id: DefId) -> hir::Constness {
-    let def_id = def_id.expect_local();
-    let node = tcx.hir().get_by_def_id(def_id);
-
-    match node {
+    let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local());
+    match tcx.hir().get(hir_id) {
         hir::Node::Ctor(_) => hir::Constness::Const,
-        hir::Node::Item(hir::Item { kind: hir::ItemKind::Impl(impl_), .. }) => impl_.constness,
+
         hir::Node::ForeignItem(hir::ForeignItem { kind: hir::ForeignItemKind::Fn(..), .. }) => {
             // Intrinsics use `rustc_const_{un,}stable` attributes to indicate constness. All other
             // foreign items cannot be evaluated at compile-time.
@@ -41,20 +39,62 @@ fn constness(tcx: TyCtxt<'_>, def_id: DefId) -> hir::Constness {
             };
             if is_const { hir::Constness::Const } else { hir::Constness::NotConst }
         }
-        _ => {
-            if let Some(fn_kind) = node.fn_kind() {
-                if fn_kind.constness() == hir::Constness::Const {
-                    return hir::Constness::Const;
-                }
 
-                // If the function itself is not annotated with `const`, it may still be a `const fn`
-                // if it resides in a const trait impl.
-                let is_const = is_parent_const_impl_raw(tcx, def_id);
-                if is_const { hir::Constness::Const } else { hir::Constness::NotConst }
-            } else {
-                hir::Constness::NotConst
+        hir::Node::TraitItem(hir::TraitItem { kind: hir::TraitItemKind::Fn(..), .. })
+            if tcx.is_const_default_method(def_id) =>
+        {
+            hir::Constness::Const
+        }
+
+        hir::Node::Item(hir::Item { kind: hir::ItemKind::Const(..), .. })
+        | hir::Node::Item(hir::Item { kind: hir::ItemKind::Static(..), .. })
+        | hir::Node::TraitItem(hir::TraitItem { kind: hir::TraitItemKind::Const(..), .. })
+        | hir::Node::AnonConst(_)
+        | hir::Node::ImplItem(hir::ImplItem { kind: hir::ImplItemKind::Const(..), .. })
+        | hir::Node::ImplItem(hir::ImplItem {
+            kind:
+                hir::ImplItemKind::Fn(
+                    hir::FnSig {
+                        header: hir::FnHeader { constness: hir::Constness::Const, .. },
+                        ..
+                    },
+                    ..,
+                ),
+            ..
+        }) => hir::Constness::Const,
+
+        hir::Node::ImplItem(hir::ImplItem {
+            kind: hir::ImplItemKind::Type(..) | hir::ImplItemKind::Fn(..),
+            ..
+        }) => {
+            let parent_hir_id = tcx.hir().get_parent_node(hir_id);
+            match tcx.hir().get(parent_hir_id) {
+                hir::Node::Item(hir::Item {
+                    kind: hir::ItemKind::Impl(hir::Impl { constness, .. }),
+                    ..
+                }) => *constness,
+                _ => span_bug!(
+                    tcx.def_span(parent_hir_id.owner),
+                    "impl item's parent node is not an impl",
+                ),
             }
         }
+
+        hir::Node::Item(hir::Item {
+            kind: hir::ItemKind::Fn(hir::FnSig { header: hir::FnHeader { constness, .. }, .. }, ..),
+            ..
+        })
+        | hir::Node::TraitItem(hir::TraitItem {
+            kind:
+                hir::TraitItemKind::Fn(hir::FnSig { header: hir::FnHeader { constness, .. }, .. }, ..),
+            ..
+        })
+        | hir::Node::Item(hir::Item {
+            kind: hir::ItemKind::Impl(hir::Impl { constness, .. }),
+            ..
+        }) => *constness,
+
+        _ => hir::Constness::NotConst,
     }
 }
 

Diff for: compiler/rustc_const_eval/src/interpret/operand.rs

@@ -788,9 +788,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
-    // These are in alphabetical order, which is easy to maintain.
+    // tidy-alphabetical-start
     static_assert_size!(Immediate, 48);
     static_assert_size!(ImmTy<'_>, 64);
     static_assert_size!(Operand, 56);
     static_assert_size!(OpTy<'_>, 80);
+    // tidy-alphabetical-end
 }

Diff for: compiler/rustc_const_eval/src/interpret/place.rs

@@ -892,10 +892,11 @@ where
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
-    // These are in alphabetical order, which is easy to maintain.
-    static_assert_size!(MemPlaceMeta, 24);
+    // tidy-alphabetical-start
     static_assert_size!(MemPlace, 40);
+    static_assert_size!(MemPlaceMeta, 24);
     static_assert_size!(MPlaceTy<'_>, 64);
     static_assert_size!(Place, 40);
     static_assert_size!(PlaceTy<'_>, 64);
+    // tidy-alphabetical-end
 }

Diff for: compiler/rustc_error_messages/locales/en-US/query_system.ftl

@@ -12,6 +12,8 @@ query_system_cycle_usage = cycle used when {$usage}
 
 query_system_cycle_stack_single = ...which immediately requires {$stack_bottom} again
 
+query_system_cycle_stack_middle = ...which requires {$desc}...
+
 query_system_cycle_stack_multiple = ...which again requires {$stack_bottom}, completing the cycle
 
 query_system_cycle_recursive_ty_alias = type aliases cannot be recursive

Diff for: compiler/rustc_error_messages/src/lib.rs

@@ -35,6 +35,7 @@ pub use unic_langid::{langid, LanguageIdentifier};
 
 // Generates `DEFAULT_LOCALE_RESOURCES` static and `fluent_generated` module.
 fluent_messages! {
+    // tidy-alphabetical-start
     ast_lowering => "../locales/en-US/ast_lowering.ftl",
     ast_passes => "../locales/en-US/ast_passes.ftl",
     attr => "../locales/en-US/attr.ftl",
@@ -64,6 +65,7 @@ fluent_messages! {
     symbol_mangling => "../locales/en-US/symbol_mangling.ftl",
     trait_selection => "../locales/en-US/trait_selection.ftl",
     ty_utils => "../locales/en-US/ty_utils.ftl",
+    // tidy-alphabetical-end
 }
 
 pub use fluent_generated::{self as fluent, DEFAULT_LOCALE_RESOURCES};
@@ -277,6 +279,18 @@ pub enum SubdiagnosticMessage {
     /// Non-translatable diagnostic message.
     // FIXME(davidtwco): can a `Cow<'static, str>` be used here?
     Str(String),
+    /// Translatable message which has already been translated eagerly.
+    ///
+    /// Some diagnostics have repeated subdiagnostics where the same interpolated variables would
+    /// be instantiated multiple times with different values. As translation normally happens
+    /// immediately prior to emission, after the diagnostic and subdiagnostic derive logic has run,
+    /// the setting of diagnostic arguments in the derived code will overwrite previous variable
+    /// values and only the final value will be set when translation occurs - resulting in
+    /// incorrect diagnostics. Eager translation results in translation for a subdiagnostic
+    /// happening immediately after the subdiagnostic derive's logic has been run. This variant
+    /// stores messages which have been translated eagerly.
+    // FIXME(#100717): can a `Cow<'static, str>` be used here?
+    Eager(String),
     /// Identifier of a Fluent message. Instances of this variant are generated by the
     /// `Subdiagnostic` derive.
     FluentIdentifier(FluentId),
@@ -304,8 +318,20 @@ impl<S: Into<String>> From<S> for SubdiagnosticMessage {
 #[rustc_diagnostic_item = "DiagnosticMessage"]
 pub enum DiagnosticMessage {
     /// Non-translatable diagnostic message.
-    // FIXME(davidtwco): can a `Cow<'static, str>` be used here?
+    // FIXME(#100717): can a `Cow<'static, str>` be used here?
     Str(String),
+    /// Translatable message which has already been translated eagerly.
+    ///
+    /// Some diagnostics have repeated subdiagnostics where the same interpolated variables would
+    /// be instantiated multiple times with different values. As translation normally happens
+    /// immediately prior to emission, after the diagnostic and subdiagnostic derive logic has run,
+    /// the setting of diagnostic arguments in the derived code will overwrite previous variable
+    /// values and only the final value will be set when translation occurs - resulting in
+    /// incorrect diagnostics. Eager translation results in translation for a subdiagnostic
+    /// happening immediately after the subdiagnostic derive's logic has been run. This variant
+    /// stores messages which have been translated eagerly.
+    // FIXME(#100717): can a `Cow<'static, str>` be used here?
+    Eager(String),
     /// Identifier for a Fluent message (with optional attribute) corresponding to the diagnostic
     /// message.
     ///
@@ -324,6 +350,7 @@ impl DiagnosticMessage {
     pub fn with_subdiagnostic_message(&self, sub: SubdiagnosticMessage) -> Self {
         let attr = match sub {
             SubdiagnosticMessage::Str(s) => return DiagnosticMessage::Str(s),
+            SubdiagnosticMessage::Eager(s) => return DiagnosticMessage::Eager(s),
             SubdiagnosticMessage::FluentIdentifier(id) => {
                 return DiagnosticMessage::FluentIdentifier(id, None);
             }
@@ -332,6 +359,7 @@ impl DiagnosticMessage {
 
         match self {
             DiagnosticMessage::Str(s) => DiagnosticMessage::Str(s.clone()),
+            DiagnosticMessage::Eager(s) => DiagnosticMessage::Eager(s.clone()),
             DiagnosticMessage::FluentIdentifier(id, _) => {
                 DiagnosticMessage::FluentIdentifier(id.clone(), Some(attr))
             }
@@ -367,6 +395,7 @@ impl Into<SubdiagnosticMessage> for DiagnosticMessage {
     fn into(self) -> SubdiagnosticMessage {
         match self {
             DiagnosticMessage::Str(s) => SubdiagnosticMessage::Str(s),
+            DiagnosticMessage::Eager(s) => SubdiagnosticMessage::Eager(s),
             DiagnosticMessage::FluentIdentifier(id, None) => {
                 SubdiagnosticMessage::FluentIdentifier(id)
             }

Diff for: compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs

@@ -7,7 +7,7 @@
 
 use crate::emitter::FileWithAnnotatedLines;
 use crate::snippet::Line;
-use crate::translation::Translate;
+use crate::translation::{to_fluent_args, Translate};
 use crate::{
     CodeSuggestion, Diagnostic, DiagnosticId, DiagnosticMessage, Emitter, FluentBundle,
     LazyFallbackBundle, Level, MultiSpan, Style, SubDiagnostic,
@@ -46,7 +46,7 @@ impl Translate for AnnotateSnippetEmitterWriter {
 impl Emitter for AnnotateSnippetEmitterWriter {
     /// The entry point for the diagnostics generation
     fn emit_diagnostic(&mut self, diag: &Diagnostic) {
-        let fluent_args = self.to_fluent_args(diag.args());
+        let fluent_args = to_fluent_args(diag.args());
 
         let mut children = diag.children.clone();
         let (mut primary_span, suggestions) = self.primary_span_formatted(&diag, &fluent_args);