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, 9 insertions, 1 deletions

diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index b747f0a4fb6..9a0eea6592f 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -715,8 +715,16 @@ impl<'tcx> TyCtxt<'tcx> {
         kind: AdtKind,
         variants: IndexVec<VariantIdx, ty::VariantDef>,
         repr: ReprOptions,
+        is_anonymous: bool,
     ) -> ty::AdtDef<'tcx> {
-        self.mk_adt_def_from_data(ty::AdtDefData::new(self, did, kind, variants, repr))
+        self.mk_adt_def_from_data(ty::AdtDefData::new(
+            self,
+            did,
+            kind,
+            variants,
+            repr,
+            is_anonymous,
+        ))
     }
 
     /// Allocates a read-only byte or string literal for `mir::interpret`.