Rollup merge of #85934 - tmiasko:is-union, r=jackh726

Add `Ty::is_union` predicate

compiler/rustc_mir/src/transform/check_consts/validation.rs

@@ -752,12 +752,8 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
             | ProjectionElem::Field(..)
             | ProjectionElem::Index(_) => {
                 let base_ty = Place::ty_from(place_local, proj_base, self.body, self.tcx).ty;
-                match base_ty.ty_adt_def() {
-                    Some(def) if def.is_union() => {
-                        self.check_op(ops::UnionAccess);
-                    }
-
-                    _ => {}
+                if base_ty.is_union() {
+                    self.check_op(ops::UnionAccess);
                 }
             }
         }

compiler/rustc_mir/src/transform/check_unsafety.rs

@@ -221,7 +221,7 @@ impl<'a, 'tcx> Visitor<'tcx> for UnsafetyChecker<'a, 'tcx> {
             }
 
             let base_ty = base.ty(self.body, self.tcx).ty;
-            if base_ty.ty_adt_def().map_or(false, |adt| adt.is_union()) {
+            if base_ty.is_union() {
                 // If we did not hit a `Deref` yet and the overall place use is an assignment, the
                 // rules are different.
                 let assign_to_field = !saw_deref

compiler/rustc_mir/src/transform/dest_prop.rs

@@ -114,7 +114,7 @@ use rustc_middle::mir::{
     traversal, Body, InlineAsmOperand, Local, LocalKind, Location, Operand, Place, PlaceElem,
     Rvalue, Statement, StatementKind, Terminator, TerminatorKind,
 };
-use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::ty::TyCtxt;
 
 // Empirical measurements have resulted in some observations:
 // - Running on a body with a single block and 500 locals takes barely any time
@@ -910,17 +910,8 @@ impl<'a, 'tcx> Visitor<'tcx> for FindAssignments<'a, 'tcx> {
 
             // Handle the "subtle case" described above by rejecting any `dest` that is or
             // projects through a union.
-            let is_union = |ty: Ty<'_>| {
-                if let ty::Adt(def, _) = ty.kind() {
-                    if def.is_union() {
-                        return true;
-                    }
-                }
-
-                false
-            };
             let mut place_ty = PlaceTy::from_ty(self.body.local_decls[dest.local].ty);
-            if is_union(place_ty.ty) {
+            if place_ty.ty.is_union() {
                 return;
             }
             for elem in dest.projection {
@@ -930,7 +921,7 @@ impl<'a, 'tcx> Visitor<'tcx> for FindAssignments<'a, 'tcx> {
                 }
 
                 place_ty = place_ty.projection_ty(self.tcx, elem);
-                if is_union(place_ty.ty) {
+                if place_ty.ty.is_union() {
                     return;
                 }
             }

compiler/rustc_mir/src/transform/promote_consts.rs

@@ -415,11 +415,9 @@ impl<'tcx> Validator<'_, 'tcx> {
 
                     ProjectionElem::Field(..) => {
                         let base_ty = place_base.ty(self.body, self.tcx).ty;
-                        if let Some(def) = base_ty.ty_adt_def() {
+                        if base_ty.is_union() {
                             // No promotion of union field accesses.
-                            if def.is_union() {
-                                return Err(Unpromotable);
-                            }
+                            return Err(Unpromotable);
                         }
                     }
                 }

compiler/rustc_mir/src/transform/remove_zsts.rs

@@ -69,21 +69,14 @@ fn involves_a_union<'tcx>(
     tcx: TyCtxt<'tcx>,
 ) -> bool {
     let mut place_ty = PlaceTy::from_ty(local_decls[place.local].ty);
-    if is_union(place_ty.ty) {
+    if place_ty.ty.is_union() {
         return true;
     }
     for elem in place.projection {
         place_ty = place_ty.projection_ty(tcx, elem);
-        if is_union(place_ty.ty) {
+        if place_ty.ty.is_union() {
             return true;
         }
     }
     return false;
 }
-
-fn is_union(ty: Ty<'_>) -> bool {
-    match ty.kind() {
-        ty::Adt(def, _) if def.is_union() => true,
-        _ => false,
-    }
-}