Auto merge of rust-lang#145020 - GuillaumeGomez:rollup-5prs9kw, r=GuillaumeGomez

Rollup of 15 pull requests

Successful merges:

 - rust-lang#144195 (Parser: Recover from attributes applied to types and generic args)
 - rust-lang#144794 (Port `#[coroutine]` to the new attribute system)
 - rust-lang#144835 (Anonymize binders in tail call sig)
 - rust-lang#144861 (Stabilize `panic_payload_as_str` feature)
 - rust-lang#144917 (Enforce tail call type is related to body return type in borrowck)
 - rust-lang#144948 (we only merge candidates for trait and normalizes-to goals)
 - rust-lang#144956 (Gate const trait syntax)
 - rust-lang#144970 (rustdoc: fix caching of intra-doc links on reexports)
 - rust-lang#144972 (add code example showing that file_prefix treats dotfiles as the name of a file, not an extension)
 - rust-lang#144975 (`File::set_times`: Update documentation and example to support setting timestamps on directories)
 - rust-lang#144977 (Fortify generic param default checks)
 - rust-lang#144996 (simplifycfg: Mark as changed when start is modified in collapse goto chain)
 - rust-lang#144998 (mir: Do not modify NonUse in `super_projection_elem`)
 - rust-lang#145000 (Remove unneeded `stage` parameter when setting up stdlib Cargo)
 - rust-lang#145008 (Fix rustdoc scrape examples crash)

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

Author: bors

compiler/rustc_ast_lowering/src/expr.rs

@@ -98,7 +98,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             }
 
             let expr_hir_id = self.lower_node_id(e.id);
-            self.lower_attrs(expr_hir_id, &e.attrs, e.span);
+            let attrs = self.lower_attrs(expr_hir_id, &e.attrs, e.span);
 
             let kind = match &e.kind {
                 ExprKind::Array(exprs) => hir::ExprKind::Array(self.lower_exprs(exprs)),
@@ -232,10 +232,10 @@ impl<'hir> LoweringContext<'_, 'hir> {
                         *fn_arg_span,
                     ),
                     None => self.lower_expr_closure(
+                        attrs,
                         binder,
                         *capture_clause,
                         e.id,
-                        expr_hir_id,
                         *constness,
                         *movability,
                         fn_decl,
@@ -1052,10 +1052,10 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
     fn lower_expr_closure(
         &mut self,
+        attrs: &[rustc_hir::Attribute],
         binder: &ClosureBinder,
         capture_clause: CaptureBy,
         closure_id: NodeId,
-        closure_hir_id: hir::HirId,
         constness: Const,
         movability: Movability,
         decl: &FnDecl,
@@ -1067,15 +1067,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
         let (binder_clause, generic_params) = self.lower_closure_binder(binder);
 
         let (body_id, closure_kind) = self.with_new_scopes(fn_decl_span, move |this| {
-            let mut coroutine_kind = if this
-                .attrs
-                .get(&closure_hir_id.local_id)
-                .is_some_and(|attrs| attrs.iter().any(|attr| attr.has_name(sym::coroutine)))
-            {
-                Some(hir::CoroutineKind::Coroutine(Movability::Movable))
-            } else {
-                None
-            };
+
+            let mut coroutine_kind = find_attr!(attrs, AttributeKind::Coroutine(_) => hir::CoroutineKind::Coroutine(Movability::Movable));
+
             // FIXME(contracts): Support contracts on closures?
             let body_id = this.lower_fn_body(decl, None, |this| {
                 this.coroutine_kind = coroutine_kind;

compiler/rustc_attr_parsing/src/attributes/body.rs

@@ -0,0 +1,15 @@
+//! Attributes that can be found in function body.
+
+use rustc_hir::attrs::AttributeKind;
+use rustc_span::{Symbol, sym};
+
+use super::{NoArgsAttributeParser, OnDuplicate};
+use crate::context::Stage;
+
+pub(crate) struct CoroutineParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for CoroutineParser {
+    const PATH: &[Symbol] = &[sym::coroutine];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const CREATE: fn(rustc_span::Span) -> AttributeKind = |span| AttributeKind::Coroutine(span);
+}

compiler/rustc_attr_parsing/src/attributes/mod.rs

@@ -26,6 +26,7 @@ use crate::parser::ArgParser;
 use crate::session_diagnostics::UnusedMultiple;
 
 pub(crate) mod allow_unstable;
+pub(crate) mod body;
 pub(crate) mod cfg;
 pub(crate) mod cfg_old;
 pub(crate) mod codegen_attrs;

compiler/rustc_attr_parsing/src/context.rs

@@ -16,6 +16,7 @@ use rustc_span::{DUMMY_SP, ErrorGuaranteed, Span, Symbol, sym};
 use crate::attributes::allow_unstable::{
     AllowConstFnUnstableParser, AllowInternalUnstableParser, UnstableFeatureBoundParser,
 };
+use crate::attributes::body::CoroutineParser;
 use crate::attributes::codegen_attrs::{
     ColdParser, CoverageParser, ExportNameParser, NakedParser, NoMangleParser, OptimizeParser,
     TargetFeatureParser, TrackCallerParser, UsedParser,
@@ -184,6 +185,7 @@ attribute_parsers!(
         Single<WithoutArgs<ConstContinueParser>>,
         Single<WithoutArgs<ConstStabilityIndirectParser>>,
         Single<WithoutArgs<ConstTraitParser>>,
+        Single<WithoutArgs<CoroutineParser>>,
         Single<WithoutArgs<DenyExplicitImplParser>>,
         Single<WithoutArgs<DoNotImplementViaObjectParser>>,
         Single<WithoutArgs<ExportStableParser>>,

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -769,9 +769,13 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
             }
             TerminatorKind::Call { func, args, .. }
             | TerminatorKind::TailCall { func, args, .. } => {
-                let call_source = match term.kind {
-                    TerminatorKind::Call { call_source, .. } => call_source,
-                    TerminatorKind::TailCall { .. } => CallSource::Normal,
+                let (call_source, destination, is_diverging) = match term.kind {
+                    TerminatorKind::Call { call_source, destination, target, .. } => {
+                        (call_source, destination, target.is_none())
+                    }
+                    TerminatorKind::TailCall { .. } => {
+                        (CallSource::Normal, RETURN_PLACE.into(), false)
+                    }
                     _ => unreachable!(),
                 };
 
@@ -845,9 +849,7 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                     );
                 }
 
-                if let TerminatorKind::Call { destination, target, .. } = term.kind {
-                    self.check_call_dest(term, &sig, destination, target, term_location);
-                }
+                self.check_call_dest(term, &sig, destination, is_diverging, term_location);
 
                 // The ordinary liveness rules will ensure that all
                 // regions in the type of the callee are live here. We
@@ -1874,65 +1876,61 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         term: &Terminator<'tcx>,
         sig: &ty::FnSig<'tcx>,
         destination: Place<'tcx>,
-        target: Option<BasicBlock>,
+        is_diverging: bool,
         term_location: Location,
     ) {
         let tcx = self.tcx();
-        match target {
-            Some(_) => {
-                let dest_ty = destination.ty(self.body, tcx).ty;
-                let dest_ty = self.normalize(dest_ty, term_location);
-                let category = match destination.as_local() {
-                    Some(RETURN_PLACE) => {
-                        if let DefiningTy::Const(def_id, _) | DefiningTy::InlineConst(def_id, _) =
-                            self.universal_regions.defining_ty
-                        {
-                            if tcx.is_static(def_id) {
-                                ConstraintCategory::UseAsStatic
-                            } else {
-                                ConstraintCategory::UseAsConst
-                            }
+        if is_diverging {
+            // The signature in this call can reference region variables,
+            // so erase them before calling a query.
+            let output_ty = self.tcx().erase_regions(sig.output());
+            if !output_ty
+                .is_privately_uninhabited(self.tcx(), self.infcx.typing_env(self.infcx.param_env))
+            {
+                span_mirbug!(self, term, "call to converging function {:?} w/o dest", sig);
+            }
+        } else {
+            let dest_ty = destination.ty(self.body, tcx).ty;
+            let dest_ty = self.normalize(dest_ty, term_location);
+            let category = match destination.as_local() {
+                Some(RETURN_PLACE) => {
+                    if let DefiningTy::Const(def_id, _) | DefiningTy::InlineConst(def_id, _) =
+                        self.universal_regions.defining_ty
+                    {
+                        if tcx.is_static(def_id) {
+                            ConstraintCategory::UseAsStatic
                         } else {
-                            ConstraintCategory::Return(ReturnConstraint::Normal)
+                            ConstraintCategory::UseAsConst
                         }
+                    } else {
+                        ConstraintCategory::Return(ReturnConstraint::Normal)
                     }
-                    Some(l) if !self.body.local_decls[l].is_user_variable() => {
-                        ConstraintCategory::Boring
-                    }
-                    // The return type of a call is interesting for diagnostics.
-                    _ => ConstraintCategory::Assignment,
-                };
-
-                let locations = term_location.to_locations();
-
-                if let Err(terr) = self.sub_types(sig.output(), dest_ty, locations, category) {
-                    span_mirbug!(
-                        self,
-                        term,
-                        "call dest mismatch ({:?} <- {:?}): {:?}",
-                        dest_ty,
-                        sig.output(),
-                        terr
-                    );
                 }
-
-                // When `unsized_fn_params` is not enabled,
-                // this check is done at `check_local`.
-                if self.unsized_feature_enabled() {
-                    let span = term.source_info.span;
-                    self.ensure_place_sized(dest_ty, span);
+                Some(l) if !self.body.local_decls[l].is_user_variable() => {
+                    ConstraintCategory::Boring
                 }
+                // The return type of a call is interesting for diagnostics.
+                _ => ConstraintCategory::Assignment,
+            };
+
+            let locations = term_location.to_locations();
+
+            if let Err(terr) = self.sub_types(sig.output(), dest_ty, locations, category) {
+                span_mirbug!(
+                    self,
+                    term,
+                    "call dest mismatch ({:?} <- {:?}): {:?}",
+                    dest_ty,
+                    sig.output(),
+                    terr
+                );
             }
-            None => {
-                // The signature in this call can reference region variables,
-                // so erase them before calling a query.
-                let output_ty = self.tcx().erase_regions(sig.output());
-                if !output_ty.is_privately_uninhabited(
-                    self.tcx(),
-                    self.infcx.typing_env(self.infcx.param_env),
-                ) {
-                    span_mirbug!(self, term, "call to converging function {:?} w/o dest", sig);
-                }
+
+            // When `unsized_fn_params` is not enabled,
+            // this check is done at `check_local`.
+            if self.unsized_feature_enabled() {
+                let span = term.source_info.span;
+                self.ensure_place_sized(dest_ty, span);
             }
         }
     }

compiler/rustc_hir/src/attrs/data_structures.rs

@@ -297,6 +297,9 @@ pub enum AttributeKind {
     /// Represents `#[const_trait]`.
     ConstTrait(Span),
 
+    /// Represents `#[coroutine]`.
+    Coroutine(Span),
+
     /// Represents `#[coverage(..)]`.
     Coverage(Span, CoverageAttrKind),
 

compiler/rustc_hir/src/attrs/encode_cross_crate.rs

@@ -28,6 +28,7 @@ impl AttributeKind {
             ConstStability { .. } => Yes,
             ConstStabilityIndirect => No,
             ConstTrait(..) => No,
+            Coroutine(..) => No,
             Coverage(..) => No,
             DenyExplicitImpl(..) => No,
             Deprecation { .. } => Yes,