Rollup of 9 pull requests

.github/workflows/dependencies.yml

@@ -64,6 +64,10 @@ jobs:
       - name: cargo update
         # Remove first line that always just says "Updating crates.io index"
         run: cargo update 2>&1 | sed '/crates.io index/d' | tee -a cargo_update.log
+      - name: cargo update library
+        run: |
+          echo -e "\nlibrary dependencies:" >> cargo_update.log
+          cargo update --manifest-path library/Cargo.toml 2>&1 | sed '/crates.io index/d' | tee -a cargo_update.log
       - name: cargo update rustbook
         run: |
           echo -e "\nrustbook dependencies:" >> cargo_update.log
@@ -74,6 +78,7 @@ jobs:
           name: Cargo-lock
           path: |
             Cargo.lock
+            library/Cargo.lock
             src/tools/rustbook/Cargo.lock
           retention-days: 1
       - name: upload cargo-update log artifact for use in PR
@@ -119,7 +124,7 @@ jobs:
           git config user.name github-actions
           git config user.email github-actions@github.com
           git switch --force-create cargo_update
-          git add ./Cargo.lock ./src/tools/rustbook/Cargo.lock
+          git add ./Cargo.lock ./library/Cargo.lock ./src/tools/rustbook/Cargo.lock
           git commit --no-verify --file=commit.txt
 
       - name: push

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -747,7 +747,7 @@ fn region_known_to_outlive<'tcx>(
     region_b: ty::Region<'tcx>,
 ) -> bool {
     test_region_obligations(tcx, id, param_env, wf_tys, |infcx| {
-        infcx.sub_regions(infer::RelateRegionParamBound(DUMMY_SP), region_b, region_a);
+        infcx.sub_regions(infer::RelateRegionParamBound(DUMMY_SP, None), region_b, region_a);
     })
 }
 

compiler/rustc_infer/src/infer/context.rs

@@ -167,7 +167,7 @@ impl<'tcx> InferCtxtLike for InferCtxt<'tcx> {
     }
 
     fn sub_regions(&self, sub: ty::Region<'tcx>, sup: ty::Region<'tcx>) {
-        self.sub_regions(SubregionOrigin::RelateRegionParamBound(DUMMY_SP), sub, sup)
+        self.sub_regions(SubregionOrigin::RelateRegionParamBound(DUMMY_SP, None), sub, sup)
     }
 
     fn register_ty_outlives(&self, ty: Ty<'tcx>, r: ty::Region<'tcx>) {

compiler/rustc_infer/src/infer/mod.rs

@@ -390,7 +390,7 @@ pub enum SubregionOrigin<'tcx> {
 
     /// The given region parameter was instantiated with a region
     /// that must outlive some other region.
-    RelateRegionParamBound(Span),
+    RelateRegionParamBound(Span, Option<Ty<'tcx>>),
 
     /// Creating a pointer `b` to contents of another reference.
     Reborrow(Span),
@@ -859,7 +859,7 @@ impl<'tcx> InferCtxt<'tcx> {
     ) {
         self.enter_forall(predicate, |ty::OutlivesPredicate(r_a, r_b)| {
             let origin = SubregionOrigin::from_obligation_cause(cause, || {
-                RelateRegionParamBound(cause.span)
+                RelateRegionParamBound(cause.span, None)
             });
             self.sub_regions(origin, r_b, r_a); // `b : a` ==> `a <= b`
         })
@@ -1685,7 +1685,7 @@ impl<'tcx> SubregionOrigin<'tcx> {
             Subtype(ref a) => a.span(),
             RelateObjectBound(a) => a,
             RelateParamBound(a, ..) => a,
-            RelateRegionParamBound(a) => a,
+            RelateRegionParamBound(a, _) => a,
             Reborrow(a) => a,
             ReferenceOutlivesReferent(_, a) => a,
             CompareImplItemObligation { span, .. } => span,
@@ -1726,6 +1726,10 @@ impl<'tcx> SubregionOrigin<'tcx> {
                 SubregionOrigin::AscribeUserTypeProvePredicate(span)
             }
 
+            traits::ObligationCauseCode::ObjectTypeBound(ty, _reg) => {
+                SubregionOrigin::RelateRegionParamBound(cause.span, Some(ty))
+            }
+
             _ => default(),
         }
     }

compiler/rustc_lint/src/internal.rs

@@ -8,7 +8,7 @@ use rustc_hir::{
     BinOp, BinOpKind, Expr, ExprKind, GenericArg, HirId, Impl, Item, ItemKind, Node, Pat, PatKind,
     Path, PathSegment, QPath, Ty, TyKind,
 };
-use rustc_middle::ty::{self, Ty as MiddleTy};
+use rustc_middle::ty::{self, GenericArgsRef, Ty as MiddleTy};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::hygiene::{ExpnKind, MacroKind};
 use rustc_span::symbol::{kw, sym, Symbol};
@@ -415,14 +415,17 @@ declare_lint_pass!(Diagnostics => [UNTRANSLATABLE_DIAGNOSTIC, DIAGNOSTIC_OUTSIDE
 
 impl LateLintPass<'_> for Diagnostics {
     fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+        let collect_args_tys_and_spans = |args: &[Expr<'_>], reserve_one_extra: bool| {
+            let mut result = Vec::with_capacity(args.len() + usize::from(reserve_one_extra));
+            result.extend(args.iter().map(|arg| (cx.typeck_results().expr_ty(arg), arg.span)));
+            result
+        };
         // Only check function calls and method calls.
-        let (span, def_id, fn_gen_args, call_tys) = match expr.kind {
+        let (span, def_id, fn_gen_args, arg_tys_and_spans) = match expr.kind {
             ExprKind::Call(callee, args) => {
                 match cx.typeck_results().node_type(callee.hir_id).kind() {
                     &ty::FnDef(def_id, fn_gen_args) => {
-                        let call_tys: Vec<_> =
-                            args.iter().map(|arg| cx.typeck_results().expr_ty(arg)).collect();
-                        (callee.span, def_id, fn_gen_args, call_tys)
+                        (callee.span, def_id, fn_gen_args, collect_args_tys_and_spans(args, false))
                     }
                     _ => return, // occurs for fns passed as args
                 }
@@ -432,66 +435,94 @@ impl LateLintPass<'_> for Diagnostics {
                 else {
                     return;
                 };
-                let mut call_tys: Vec<_> =
-                    args.iter().map(|arg| cx.typeck_results().expr_ty(arg)).collect();
-                call_tys.insert(0, cx.tcx.types.self_param); // dummy inserted for `self`
-                (span, def_id, fn_gen_args, call_tys)
+                let mut args = collect_args_tys_and_spans(args, true);
+                args.insert(0, (cx.tcx.types.self_param, _recv.span)); // dummy inserted for `self`
+                (span, def_id, fn_gen_args, args)
             }
             _ => return,
         };
 
-        // Is the callee marked with `#[rustc_lint_diagnostics]`?
-        let has_attr = ty::Instance::try_resolve(cx.tcx, cx.param_env, def_id, fn_gen_args)
-            .ok()
-            .flatten()
-            .is_some_and(|inst| cx.tcx.has_attr(inst.def_id(), sym::rustc_lint_diagnostics));
-
-        // Closure: is the type `{D,Subd}iagMessage`?
-        let is_diag_message = |ty: MiddleTy<'_>| {
-            if let Some(adt_def) = ty.ty_adt_def()
-                && let Some(name) = cx.tcx.get_diagnostic_name(adt_def.did())
-                && matches!(name, sym::DiagMessage | sym::SubdiagMessage)
-            {
-                true
-            } else {
-                false
-            }
-        };
+        Self::diagnostic_outside_of_impl(cx, span, expr.hir_id, def_id, fn_gen_args);
+        Self::untranslatable_diagnostic(cx, def_id, &arg_tys_and_spans);
+    }
+}
 
-        // Does the callee have one or more `impl Into<{D,Subd}iagMessage>` parameters?
-        let mut impl_into_diagnostic_message_params = vec![];
+impl Diagnostics {
+    // Is the type `{D,Subd}iagMessage`?
+    fn is_diag_message<'cx>(cx: &LateContext<'cx>, ty: MiddleTy<'cx>) -> bool {
+        if let Some(adt_def) = ty.ty_adt_def()
+            && let Some(name) = cx.tcx.get_diagnostic_name(adt_def.did())
+            && matches!(name, sym::DiagMessage | sym::SubdiagMessage)
+        {
+            true
+        } else {
+            false
+        }
+    }
+
+    fn untranslatable_diagnostic<'cx>(
+        cx: &LateContext<'cx>,
+        def_id: DefId,
+        arg_tys_and_spans: &[(MiddleTy<'cx>, Span)],
+    ) {
         let fn_sig = cx.tcx.fn_sig(def_id).instantiate_identity().skip_binder();
         let predicates = cx.tcx.predicates_of(def_id).instantiate_identity(cx.tcx).predicates;
         for (i, &param_ty) in fn_sig.inputs().iter().enumerate() {
-            if let ty::Param(p) = param_ty.kind() {
+            if let ty::Param(sig_param) = param_ty.kind() {
                 // It is a type parameter. Check if it is `impl Into<{D,Subd}iagMessage>`.
                 for pred in predicates.iter() {
                     if let Some(trait_pred) = pred.as_trait_clause()
                         && let trait_ref = trait_pred.skip_binder().trait_ref
                         && trait_ref.self_ty() == param_ty // correct predicate for the param?
                         && cx.tcx.is_diagnostic_item(sym::Into, trait_ref.def_id)
                         && let ty1 = trait_ref.args.type_at(1)
-                        && is_diag_message(ty1)
+                        && Self::is_diag_message(cx, ty1)
                     {
-                        impl_into_diagnostic_message_params.push((i, p.name));
+                        // Calls to methods with an `impl Into<{D,Subd}iagMessage>` parameter must be passed an arg
+                        // with type `{D,Subd}iagMessage` or `impl Into<{D,Subd}iagMessage>`. Otherwise, emit an
+                        // `UNTRANSLATABLE_DIAGNOSTIC` lint.
+                        let (arg_ty, arg_span) = arg_tys_and_spans[i];
+
+                        // Is the arg type `{Sub,D}iagMessage`or `impl Into<{Sub,D}iagMessage>`?
+                        let is_translatable = Self::is_diag_message(cx, arg_ty)
+                            || matches!(arg_ty.kind(), ty::Param(arg_param) if arg_param.name == sig_param.name);
+                        if !is_translatable {
+                            cx.emit_span_lint(
+                                UNTRANSLATABLE_DIAGNOSTIC,
+                                arg_span,
+                                UntranslatableDiag,
+                            );
+                        }
                     }
                 }
             }
         }
+    }
 
-        // Is the callee interesting?
-        if !has_attr && impl_into_diagnostic_message_params.is_empty() {
+    fn diagnostic_outside_of_impl<'cx>(
+        cx: &LateContext<'cx>,
+        span: Span,
+        current_id: HirId,
+        def_id: DefId,
+        fn_gen_args: GenericArgsRef<'cx>,
+    ) {
+        // Is the callee marked with `#[rustc_lint_diagnostics]`?
+        let Some(inst) =
+            ty::Instance::try_resolve(cx.tcx, cx.param_env, def_id, fn_gen_args).ok().flatten()
+        else {
             return;
-        }
+        };
+        let has_attr = cx.tcx.has_attr(inst.def_id(), sym::rustc_lint_diagnostics);
+        if !has_attr {
+            return;
+        };
 
-        // Is the parent method marked with `#[rustc_lint_diagnostics]`?
-        let mut parent_has_attr = false;
-        for (hir_id, _parent) in cx.tcx.hir().parent_iter(expr.hir_id) {
+        for (hir_id, _parent) in cx.tcx.hir().parent_iter(current_id) {
             if let Some(owner_did) = hir_id.as_owner()
                 && cx.tcx.has_attr(owner_did, sym::rustc_lint_diagnostics)
             {
-                parent_has_attr = true;
-                break;
+                // The parent method is marked with `#[rustc_lint_diagnostics]`
+                return;
             }
         }
 
@@ -500,37 +531,22 @@ impl LateLintPass<'_> for Diagnostics {
         // - inside a parent function that is itself marked with `#[rustc_lint_diagnostics]`.
         //
         // Otherwise, emit a `DIAGNOSTIC_OUTSIDE_OF_IMPL` lint.
-        if has_attr && !parent_has_attr {
-            let mut is_inside_appropriate_impl = false;
-            for (_hir_id, parent) in cx.tcx.hir().parent_iter(expr.hir_id) {
-                debug!(?parent);
-                if let Node::Item(Item { kind: ItemKind::Impl(impl_), .. }) = parent
-                    && let Impl { of_trait: Some(of_trait), .. } = impl_
-                    && let Some(def_id) = of_trait.trait_def_id()
-                    && let Some(name) = cx.tcx.get_diagnostic_name(def_id)
-                    && matches!(name, sym::Diagnostic | sym::Subdiagnostic | sym::LintDiagnostic)
-                {
-                    is_inside_appropriate_impl = true;
-                    break;
-                }
-            }
-            debug!(?is_inside_appropriate_impl);
-            if !is_inside_appropriate_impl {
-                cx.emit_span_lint(DIAGNOSTIC_OUTSIDE_OF_IMPL, span, DiagOutOfImpl);
+        let mut is_inside_appropriate_impl = false;
+        for (_hir_id, parent) in cx.tcx.hir().parent_iter(current_id) {
+            debug!(?parent);
+            if let Node::Item(Item { kind: ItemKind::Impl(impl_), .. }) = parent
+                && let Impl { of_trait: Some(of_trait), .. } = impl_
+                && let Some(def_id) = of_trait.trait_def_id()
+                && let Some(name) = cx.tcx.get_diagnostic_name(def_id)
+                && matches!(name, sym::Diagnostic | sym::Subdiagnostic | sym::LintDiagnostic)
+            {
+                is_inside_appropriate_impl = true;
+                break;
             }
         }
-
-        // Calls to methods with an `impl Into<{D,Subd}iagMessage>` parameter must be passed an arg
-        // with type `{D,Subd}iagMessage` or `impl Into<{D,Subd}iagMessage>`. Otherwise, emit an
-        // `UNTRANSLATABLE_DIAGNOSTIC` lint.
-        for (param_i, param_i_p_name) in impl_into_diagnostic_message_params {
-            // Is the arg type `{Sub,D}iagMessage`or `impl Into<{Sub,D}iagMessage>`?
-            let arg_ty = call_tys[param_i];
-            let is_translatable = is_diag_message(arg_ty)
-                || matches!(arg_ty.kind(), ty::Param(p) if p.name == param_i_p_name);
-            if !is_translatable {
-                cx.emit_span_lint(UNTRANSLATABLE_DIAGNOSTIC, span, UntranslatableDiag);
-            }
+        debug!(?is_inside_appropriate_impl);
+        if !is_inside_appropriate_impl {
+            cx.emit_span_lint(DIAGNOSTIC_OUTSIDE_OF_IMPL, span, DiagOutOfImpl);
         }
     }
 }

compiler/rustc_span/src/hygiene.rs

@@ -1415,6 +1415,14 @@ pub fn decode_syntax_context<D: Decoder, F: FnOnce(&mut D, u32) -> SyntaxContext
 
     // Overwrite the dummy data with our decoded SyntaxContextData
     HygieneData::with(|hygiene_data| {
+        if let Some(old) = hygiene_data.syntax_context_data.get(raw_id as usize)
+            && old.outer_expn == ctxt_data.outer_expn
+            && old.outer_transparency == ctxt_data.outer_transparency
+            && old.parent == ctxt_data.parent
+        {
+            ctxt_data = old.clone();
+        }
+
         let dummy = std::mem::replace(
             &mut hygiene_data.syntax_context_data[ctxt.as_u32() as usize],
             ctxt_data,

compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/placeholder_relation.rs

@@ -11,7 +11,7 @@ impl<'tcx> NiceRegionError<'_, 'tcx> {
     pub(super) fn try_report_placeholder_relation(&self) -> Option<Diag<'tcx>> {
         match &self.error {
             Some(RegionResolutionError::ConcreteFailure(
-                SubregionOrigin::RelateRegionParamBound(span),
+                SubregionOrigin::RelateRegionParamBound(span, _),
                 Region(Interned(
                     RePlaceholder(ty::Placeholder {
                         bound: ty::BoundRegion { kind: sub_name, .. },

compiler/rustc_trait_selection/src/error_reporting/infer/note.rs

@@ -52,7 +52,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                         .add_to_diag(err);
                 }
             }
-            infer::RelateRegionParamBound(span) => {
+            infer::RelateRegionParamBound(span, _) => {
                 RegionOriginNote::Plain { span, msg: fluent::infer_relate_region_param_bound }
                     .add_to_diag(err);
             }
@@ -199,7 +199,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     note,
                 })
             }
-            infer::RelateRegionParamBound(span) => {
+            infer::RelateRegionParamBound(span, _) => {
                 let param_instantiated = note_and_explain::RegionExplanation::new(
                     self.tcx,
                     generic_param_scope,

compiler/rustc_trait_selection/src/error_reporting/infer/region.rs

@@ -257,7 +257,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     .add_to_diag(err);
                 }
             }
-            infer::RelateRegionParamBound(span) => {
+            infer::RelateRegionParamBound(span, _) => {
                 RegionOriginNote::Plain {
                     span,
                     msg: fluent::trait_selection_relate_region_param_bound,
@@ -410,7 +410,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     note,
                 })
             }
-            infer::RelateRegionParamBound(span) => {
+            infer::RelateRegionParamBound(span, ty) => {
                 let param_instantiated = note_and_explain::RegionExplanation::new(
                     self.tcx,
                     generic_param_scope,
@@ -419,11 +419,31 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     note_and_explain::PrefixKind::LfParamInstantiatedWith,
                     note_and_explain::SuffixKind::Empty,
                 );
+                let mut alt_span = None;
+                if let Some(ty) = ty
+                    && sub.is_static()
+                    && let ty::Dynamic(preds, _, ty::DynKind::Dyn) = ty.kind()
+                    && let Some(def_id) = preds.principal_def_id()
+                {
+                    for (clause, span) in
+                        self.tcx.predicates_of(def_id).instantiate_identity(self.tcx)
+                    {
+                        if let ty::ClauseKind::TypeOutlives(ty::OutlivesPredicate(a, b)) =
+                            clause.kind().skip_binder()
+                            && let ty::Param(param) = a.kind()
+                            && param.name == kw::SelfUpper
+                            && b.is_static()
+                        {
+                            // Point at explicit `'static` bound on the trait (`trait T: 'static`).
+                            alt_span = Some(span);
+                        }
+                    }
+                }
                 let param_must_outlive = note_and_explain::RegionExplanation::new(
                     self.tcx,
                     generic_param_scope,
                     sub,
-                    None,
+                    alt_span,
                     note_and_explain::PrefixKind::LfParamMustOutlive,
                     note_and_explain::SuffixKind::Empty,
                 );