Lower anonymous structs or unions to HIR

compiler/rustc_hir/src/def.rs

@@ -8,6 +8,7 @@ use rustc_data_structures::unord::UnordMap;
 use rustc_macros::HashStable_Generic;
 use rustc_span::def_id::{DefId, LocalDefId};
 use rustc_span::hygiene::MacroKind;
+use rustc_span::symbol::kw;
 use rustc_span::Symbol;
 
 use std::array::IntoIter;
@@ -225,6 +226,7 @@ impl DefKind {
 
     pub fn def_path_data(self, name: Symbol) -> DefPathData {
         match self {
+            DefKind::Struct | DefKind::Union if name == kw::Empty => DefPathData::AnonAdt,
             DefKind::Mod
             | DefKind::Struct
             | DefKind::Union

compiler/rustc_hir/src/definitions.rs

@@ -287,6 +287,8 @@ pub enum DefPathData {
     /// An existential `impl Trait` type node.
     /// Argument position `impl Trait` have a `TypeNs` with their pretty-printed name.
     OpaqueTy,
+    /// An anonymous struct or union type i.e. `struct { foo: Type }` or `union { bar: Type }`
+    AnonAdt,
 }
 
 impl Definitions {
@@ -409,8 +411,9 @@ impl DefPathData {
         match *self {
             TypeNs(name) if name == kw::Empty => None,
             TypeNs(name) | ValueNs(name) | MacroNs(name) | LifetimeNs(name) => Some(name),
+
             Impl | ForeignMod | CrateRoot | Use | GlobalAsm | Closure | Ctor | AnonConst
-            | OpaqueTy => None,
+            | OpaqueTy | AnonAdt => None,
         }
     }
 
@@ -431,6 +434,7 @@ impl DefPathData {
             Ctor => DefPathDataName::Anon { namespace: sym::constructor },
             AnonConst => DefPathDataName::Anon { namespace: sym::constant },
             OpaqueTy => DefPathDataName::Anon { namespace: sym::opaque },
+            AnonAdt => DefPathDataName::Anon { namespace: sym::anon_adt },
         }
     }
 }

compiler/rustc_hir/src/hir.rs

@@ -2587,6 +2587,8 @@ pub enum TyKind<'hir> {
     Never,
     /// A tuple (`(A, B, C, D, ...)`).
     Tup(&'hir [Ty<'hir>]),
+    /// An anonymous struct or union type i.e. `struct { foo: Type }` or `union { foo: Type }`
+    AnonAdt(ItemId),
     /// A path to a type definition (`module::module::...::Type`), or an
     /// associated type (e.g., `<Vec<T> as Trait>::Type` or `<T>::Target`).
     ///

compiler/rustc_hir/src/intravisit.rs

@@ -852,6 +852,9 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty<'v>) {
         }
         TyKind::Typeof(ref expression) => visitor.visit_anon_const(expression),
         TyKind::Infer | TyKind::InferDelegation(..) | TyKind::Err(_) => {}
+        TyKind::AnonAdt(item_id) => {
+            visitor.visit_nested_item(item_id);
+        }
     }
 }