Rollup of 4 pull requests

compiler/rustc_error_codes/src/error_codes/E0691.md

@@ -11,7 +11,8 @@ struct ForceAlign32;
 
 #[repr(transparent)]
 struct Wrapper(f32, ForceAlign32); // error: zero-sized field in transparent
-                                   //        struct has alignment larger than 1
+                                   //        struct has alignment of 32, which
+                                   //        is larger than 1
 ```
 
 A transparent struct, enum, or union is supposed to be represented exactly like

compiler/rustc_hir_analysis/src/check/check.rs

@@ -1078,9 +1078,9 @@ pub(super) fn check_transparent<'tcx>(tcx: TyCtxt<'tcx>, adt: ty::AdtDef<'tcx>)
         // We are currently checking the type this field came from, so it must be local
         let span = tcx.hir().span_if_local(field.did).unwrap();
         let zst = layout.is_ok_and(|layout| layout.is_zst());
-        let align1 = layout.is_ok_and(|layout| layout.align.abi.bytes() == 1);
+        let align = layout.ok().map(|layout| layout.align.abi.bytes());
         if !zst {
-            return (span, zst, align1, None);
+            return (span, zst, align, None);
         }
 
         fn check_non_exhaustive<'tcx>(
@@ -1115,30 +1115,39 @@ pub(super) fn check_transparent<'tcx>(tcx: TyCtxt<'tcx>, adt: ty::AdtDef<'tcx>)
             }
         }
 
-        (span, zst, align1, check_non_exhaustive(tcx, ty).break_value())
+        (span, zst, align, check_non_exhaustive(tcx, ty).break_value())
     });
 
     let non_zst_fields = field_infos
         .clone()
-        .filter_map(|(span, zst, _align1, _non_exhaustive)| if !zst { Some(span) } else { None });
+        .filter_map(|(span, zst, _align, _non_exhaustive)| if !zst { Some(span) } else { None });
     let non_zst_count = non_zst_fields.clone().count();
     if non_zst_count >= 2 {
         bad_non_zero_sized_fields(tcx, adt, non_zst_count, non_zst_fields, tcx.def_span(adt.did()));
     }
     let incompatible_zst_fields =
         field_infos.clone().filter(|(_, _, _, opt)| opt.is_some()).count();
     let incompat = incompatible_zst_fields + non_zst_count >= 2 && non_zst_count < 2;
-    for (span, zst, align1, non_exhaustive) in field_infos {
-        if zst && !align1 {
-            struct_span_err!(
+    for (span, zst, align, non_exhaustive) in field_infos {
+        if zst && align != Some(1) {
+            let mut err = struct_span_err!(
                 tcx.sess,
                 span,
                 E0691,
                 "zero-sized field in transparent {} has alignment larger than 1",
                 adt.descr(),
-            )
-            .span_label(span, "has alignment larger than 1")
-            .emit();
+            );
+
+            if let Some(align_bytes) = align {
+                err.span_label(
+                    span,
+                    format!("has alignment of {align_bytes}, which is larger than 1"),
+                );
+            } else {
+                err.span_label(span, "may have alignment larger than 1");
+            }
+
+            err.emit();
         }
         if incompat && let Some((descr, def_id, args, non_exhaustive)) = non_exhaustive {
             tcx.struct_span_lint_hir(

compiler/rustc_middle/src/ty/context.rs

@@ -569,6 +569,7 @@ pub struct GlobalCtxt<'tcx> {
 
     /// Caches the results of goal evaluation in the new solver.
     pub new_solver_evaluation_cache: solve::EvaluationCache<'tcx>,
+    pub new_solver_coherence_evaluation_cache: solve::EvaluationCache<'tcx>,
 
     /// Data layout specification for the current target.
     pub data_layout: TargetDataLayout,
@@ -680,10 +681,12 @@ impl<'tcx> TyCtxt<'tcx> {
         value.lift_to_tcx(self)
     }
 
-    /// Creates a type context and call the closure with a `TyCtxt` reference
-    /// to the context. The closure enforces that the type context and any interned
-    /// value (types, args, etc.) can only be used while `ty::tls` has a valid
-    /// reference to the context, to allow formatting values that need it.
+    /// Creates a type context. To use the context call `fn enter` which
+    /// provides a `TyCtxt`.
+    ///
+    /// By only providing the `TyCtxt` inside of the closure we enforce that the type
+    /// context and any interned alue (types, args, etc.) can only be used while `ty::tls`
+    /// has a valid reference to the context, to allow formatting values that need it.
     pub fn create_global_ctxt(
         s: &'tcx Session,
         lint_store: Lrc<dyn Any + sync::DynSend + sync::DynSync>,
@@ -721,6 +724,7 @@ impl<'tcx> TyCtxt<'tcx> {
             selection_cache: Default::default(),
             evaluation_cache: Default::default(),
             new_solver_evaluation_cache: Default::default(),
+            new_solver_coherence_evaluation_cache: Default::default(),
             data_layout,
             alloc_map: Lock::new(interpret::AllocMap::new()),
         }

compiler/rustc_smir/src/rustc_internal/mod.rs

@@ -47,6 +47,14 @@ pub fn generator_def(did: DefId) -> stable_mir::ty::GeneratorDef {
     with_tables(|t| t.generator_def(did))
 }
 
+pub fn param_def(did: DefId) -> stable_mir::ty::ParamDef {
+    with_tables(|t| t.param_def(did))
+}
+
+pub fn br_named_def(did: DefId) -> stable_mir::ty::BrNamedDef {
+    with_tables(|t| t.br_named_def(did))
+}
+
 impl<'tcx> Tables<'tcx> {
     pub fn item_def_id(&self, item: &stable_mir::CrateItem) -> DefId {
         self.def_ids[item.0]
@@ -76,6 +84,14 @@ impl<'tcx> Tables<'tcx> {
         stable_mir::ty::GeneratorDef(self.create_def_id(did))
     }
 
+    pub fn param_def(&mut self, did: DefId) -> stable_mir::ty::ParamDef {
+        stable_mir::ty::ParamDef(self.create_def_id(did))
+    }
+
+    pub fn br_named_def(&mut self, did: DefId) -> stable_mir::ty::BrNamedDef {
+        stable_mir::ty::BrNamedDef(self.create_def_id(did))
+    }
+
     fn create_def_id(&mut self, did: DefId) -> stable_mir::DefId {
         // FIXME: this becomes inefficient when we have too many ids
         for (i, &d) in self.def_ids.iter().enumerate() {