From 4547b622d8d29df964fa2914213088b148c498fc Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:32 +0200
Subject: Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 compiler/rustc_ty_utils/src/ty.rs | 73 +++------------------------------------
 1 file changed, 4 insertions(+), 69 deletions(-)

(limited to 'compiler/rustc_ty_utils/src/ty.rs')

diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index 3eebb4ace..5fc9bcac1 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -49,12 +49,9 @@ fn sized_constraint_for_ty<'tcx>(
             // it on the impl.
 
             let Some(sized_trait) = tcx.lang_items().sized_trait() else { return vec![ty] };
-            let sized_predicate = ty::Binder::dummy(ty::TraitRef {
-                def_id: sized_trait,
-                substs: tcx.mk_substs_trait(ty, &[]),
-            })
-            .without_const()
-            .to_predicate(tcx);
+            let sized_predicate = ty::Binder::dummy(tcx.mk_trait_ref(sized_trait, [ty]))
+                .without_const()
+                .to_predicate(tcx);
             let predicates = tcx.predicates_of(adtdef.did()).predicates;
             if predicates.iter().any(|(p, _)| *p == sized_predicate) { vec![] } else { vec![ty] }
         }
@@ -108,12 +105,7 @@ fn adt_sized_constraint(tcx: TyCtxt<'_>, def_id: DefId) -> &[Ty<'_>] {
 
 /// See `ParamEnv` struct definition for details.
 fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
-    // The param_env of an impl Trait type is its defining function's param_env
-    if let Some(parent) = ty::is_impl_trait_defn(tcx, def_id) {
-        return param_env(tcx, parent.to_def_id());
-    }
     // Compute the bounds on Self and the type parameters.
-
     let ty::InstantiatedPredicates { mut predicates, .. } =
         tcx.predicates_of(def_id).instantiate_identity(tcx);
 
@@ -413,63 +405,7 @@ fn issue33140_self_ty(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Ty<'_>> {
 /// Check if a function is async.
 fn asyncness(tcx: TyCtxt<'_>, def_id: DefId) -> hir::IsAsync {
     let node = tcx.hir().get_by_def_id(def_id.expect_local());
-    if let Some(fn_kind) = node.fn_kind() { fn_kind.asyncness() } else { hir::IsAsync::NotAsync }
-}
-
-/// Don't call this directly: use ``tcx.conservative_is_privately_uninhabited`` instead.
-pub fn conservative_is_privately_uninhabited_raw<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    param_env_and: ty::ParamEnvAnd<'tcx, Ty<'tcx>>,
-) -> bool {
-    let (param_env, ty) = param_env_and.into_parts();
-    match ty.kind() {
-        ty::Never => {
-            debug!("ty::Never =>");
-            true
-        }
-        ty::Adt(def, _) if def.is_union() => {
-            debug!("ty::Adt(def, _) if def.is_union() =>");
-            // For now, `union`s are never considered uninhabited.
-            false
-        }
-        ty::Adt(def, substs) => {
-            debug!("ty::Adt(def, _) if def.is_not_union() =>");
-            // Any ADT is uninhabited if either:
-            // (a) It has no variants (i.e. an empty `enum`);
-            // (b) Each of its variants (a single one in the case of a `struct`) has at least
-            //     one uninhabited field.
-            def.variants().iter().all(|var| {
-                var.fields.iter().any(|field| {
-                    let ty = tcx.bound_type_of(field.did).subst(tcx, substs);
-                    tcx.conservative_is_privately_uninhabited(param_env.and(ty))
-                })
-            })
-        }
-        ty::Tuple(fields) => {
-            debug!("ty::Tuple(..) =>");
-            fields.iter().any(|ty| tcx.conservative_is_privately_uninhabited(param_env.and(ty)))
-        }
-        ty::Array(ty, len) => {
-            debug!("ty::Array(ty, len) =>");
-            match len.try_eval_usize(tcx, param_env) {
-                Some(0) | None => false,
-                // If the array is definitely non-empty, it's uninhabited if
-                // the type of its elements is uninhabited.
-                Some(1..) => tcx.conservative_is_privately_uninhabited(param_env.and(*ty)),
-            }
-        }
-        ty::Ref(..) => {
-            debug!("ty::Ref(..) =>");
-            // References to uninitialised memory is valid for any type, including
-            // uninhabited types, in unsafe code, so we treat all references as
-            // inhabited.
-            false
-        }
-        _ => {
-            debug!("_ =>");
-            false
-        }
-    }
+    node.fn_sig().map_or(hir::IsAsync::NotAsync, |sig| sig.header.asyncness)
 }
 
 pub fn provide(providers: &mut ty::query::Providers) {
@@ -481,7 +417,6 @@ pub fn provide(providers: &mut ty::query::Providers) {
         instance_def_size_estimate,
         issue33140_self_ty,
         impl_defaultness,
-        conservative_is_privately_uninhabited: conservative_is_privately_uninhabited_raw,
         ..*providers
     };
 }
-- 
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