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, 3 insertions, 2 deletions

diff --git a/compiler/rustc_parse/src/parser/ty.rs b/compiler/rustc_parse/src/parser/ty.rs
index 5fe54a536a7..157fb9e505a 100644
--- a/compiler/rustc_parse/src/parser/ty.rs
+++ b/compiler/rustc_parse/src/parser/ty.rs
@@ -396,8 +396,9 @@ impl<'a> Parser<'a> {
             self.parse_record_struct_body(if is_union { "union" } else { "struct" }, lo, false)?;
         let span = lo.to(self.prev_token.span);
         self.sess.gated_spans.gate(sym::unnamed_fields, span);
-        // These can be rejected during AST validation in `deny_anon_struct_or_union`.
-        let kind = if is_union { TyKind::AnonUnion(fields) } else { TyKind::AnonStruct(fields) };
+        let id = ast::DUMMY_NODE_ID;
+        let kind =
+            if is_union { TyKind::AnonUnion(id, fields) } else { TyKind::AnonStruct(id, fields) };
         Ok(self.mk_ty(span, kind))
     }