Auto merge of #82159 - BoxyUwU:uwu, r=varkor

Use correct param_env in conservative_is_privately_uninhabited

cc `@lcnr`
r? `@varkor` since this is your FIXME that was removed ^^

compiler/rustc_middle/src/ty/sty.rs

@@ -1697,53 +1697,6 @@ impl<'tcx> TyS<'tcx> {
         matches!(self.kind(), Never)
     }
 
-    /// Checks whether a type is definitely uninhabited. This is
-    /// conservative: for some types that are uninhabited we return `false`,
-    /// but we only return `true` for types that are definitely uninhabited.
-    /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
-    /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
-    /// size, to account for partial initialisation. See #49298 for details.)
-    pub fn conservative_is_privately_uninhabited(&self, tcx: TyCtxt<'tcx>) -> bool {
-        // FIXME(varkor): we can make this less conversative by substituting concrete
-        // type arguments.
-        match self.kind() {
-            ty::Never => true,
-            ty::Adt(def, _) if def.is_union() => {
-                // For now, `union`s are never considered uninhabited.
-                false
-            }
-            ty::Adt(def, _) => {
-                // 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| {
-                        tcx.type_of(field.did).conservative_is_privately_uninhabited(tcx)
-                    })
-                })
-            }
-            ty::Tuple(..) => {
-                self.tuple_fields().any(|ty| ty.conservative_is_privately_uninhabited(tcx))
-            }
-            ty::Array(ty, len) => {
-                match len.try_eval_usize(tcx, ParamEnv::empty()) {
-                    Some(0) | None => false,
-                    // If the array is definitely non-empty, it's uninhabited if
-                    // the type of its elements is uninhabited.
-                    Some(1..) => ty.conservative_is_privately_uninhabited(tcx),
-                }
-            }
-            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
-            }
-            _ => false,
-        }
-    }
-
     #[inline]
     pub fn is_primitive(&self) -> bool {
         self.kind().is_primitive()