Auto merge of #115367 - frank-king:feature/unnamed-fields-hir, r=davidtwco

Lowering unnamed fields and anonymous adt

This implements #49804.

Goals:
- [x] lowering anonymous ADTs from AST to HIR
- [x] generating definitions of anonymous ADTs
- [x] uniqueness check of the unnamed fields
- [x] field projection of anonymous ADTs
- [x] `#[repr(C)]` check of the anonymous ADTs

Non-Goals (will be in the next PRs)
- capturing generic params for the anonymous ADTs from the parent ADT
- pattern matching of anonymous ADTs
- structural expressions of anonymous ADTs
- rustdoc support of anonymous ADTs

1 files changed, 1 insertions, 2 deletions

diff --git a/compiler/rustc_ty_utils/src/representability.rs b/compiler/rustc_ty_utils/src/representability.rs
index 70f1f099688..ade509123ac 100644
--- a/compiler/rustc_ty_utils/src/representability.rs
+++ b/compiler/rustc_ty_utils/src/representability.rs
@@ -21,8 +21,7 @@ macro_rules! rtry {
 fn representability(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Representability {
     match tcx.def_kind(def_id) {
         DefKind::Struct | DefKind::Union | DefKind::Enum => {
-            let adt_def = tcx.adt_def(def_id);
-            for variant in adt_def.variants() {
+            for variant in tcx.adt_def(def_id).variants() {
                 for field in variant.fields.iter() {
                     rtry!(tcx.representability(field.did.expect_local()));
                 }