Rename some OwnerId fields.

spastorino noticed some silly expressions like `item_id.def_id.def_id`.

This commit renames several `def_id: OwnerId` fields as `owner_id`, so
those expressions become `item_id.owner_id.def_id`.

`item_id.owner_id.local_def_id` would be even clearer, but the use of
`def_id` for values of type `LocalDefId` is *very* widespread, so I left
that alone.

compiler/rustc_hir/src/hir.rs

@@ -2207,14 +2207,14 @@ pub struct FnSig<'hir> {
 // so it can fetched later.
 #[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct TraitItemId {
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
 }
 
 impl TraitItemId {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 }
 
@@ -2225,7 +2225,7 @@ impl TraitItemId {
 #[derive(Debug, HashStable_Generic)]
 pub struct TraitItem<'hir> {
     pub ident: Ident,
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
     pub generics: &'hir Generics<'hir>,
     pub kind: TraitItemKind<'hir>,
     pub span: Span,
@@ -2236,11 +2236,11 @@ impl TraitItem<'_> {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 
     pub fn trait_item_id(&self) -> TraitItemId {
-        TraitItemId { def_id: self.def_id }
+        TraitItemId { owner_id: self.owner_id }
     }
 }
 
@@ -2271,14 +2271,14 @@ pub enum TraitItemKind<'hir> {
 // so it can fetched later.
 #[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct ImplItemId {
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
 }
 
 impl ImplItemId {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 }
 
@@ -2286,7 +2286,7 @@ impl ImplItemId {
 #[derive(Debug, HashStable_Generic)]
 pub struct ImplItem<'hir> {
     pub ident: Ident,
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
     pub generics: &'hir Generics<'hir>,
     pub kind: ImplItemKind<'hir>,
     pub defaultness: Defaultness,
@@ -2298,11 +2298,11 @@ impl ImplItem<'_> {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 
     pub fn impl_item_id(&self) -> ImplItemId {
-        ImplItemId { def_id: self.def_id }
+        ImplItemId { owner_id: self.owner_id }
     }
 }
 
@@ -2914,14 +2914,14 @@ impl<'hir> VariantData<'hir> {
 // so it can fetched later.
 #[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, Hash, HashStable_Generic)]
 pub struct ItemId {
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
 }
 
 impl ItemId {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 }
 
@@ -2931,7 +2931,7 @@ impl ItemId {
 #[derive(Debug, HashStable_Generic)]
 pub struct Item<'hir> {
     pub ident: Ident,
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
     pub kind: ItemKind<'hir>,
     pub span: Span,
     pub vis_span: Span,
@@ -2941,11 +2941,11 @@ impl Item<'_> {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 
     pub fn item_id(&self) -> ItemId {
-        ItemId { def_id: self.def_id }
+        ItemId { owner_id: self.owner_id }
     }
 }
 
@@ -3158,14 +3158,14 @@ pub enum AssocItemKind {
 // so it can fetched later.
 #[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct ForeignItemId {
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
 }
 
 impl ForeignItemId {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 }
 
@@ -3186,7 +3186,7 @@ pub struct ForeignItemRef {
 pub struct ForeignItem<'hir> {
     pub ident: Ident,
     pub kind: ForeignItemKind<'hir>,
-    pub def_id: OwnerId,
+    pub owner_id: OwnerId,
     pub span: Span,
     pub vis_span: Span,
 }
@@ -3195,11 +3195,11 @@ impl ForeignItem<'_> {
     #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
-        HirId::make_owner(self.def_id.def_id)
+        HirId::make_owner(self.owner_id.def_id)
     }
 
     pub fn foreign_item_id(&self) -> ForeignItemId {
-        ForeignItemId { def_id: self.def_id }
+        ForeignItemId { owner_id: self.owner_id }
     }
 }
 
@@ -3291,10 +3291,10 @@ impl<'hir> OwnerNode<'hir> {
 
     pub fn def_id(self) -> OwnerId {
         match self {
-            OwnerNode::Item(Item { def_id, .. })
-            | OwnerNode::TraitItem(TraitItem { def_id, .. })
-            | OwnerNode::ImplItem(ImplItem { def_id, .. })
-            | OwnerNode::ForeignItem(ForeignItem { def_id, .. }) => *def_id,
+            OwnerNode::Item(Item { owner_id, .. })
+            | OwnerNode::TraitItem(TraitItem { owner_id, .. })
+            | OwnerNode::ImplItem(ImplItem { owner_id, .. })
+            | OwnerNode::ForeignItem(ForeignItem { owner_id, .. }) => *owner_id,
             OwnerNode::Crate(..) => crate::CRATE_HIR_ID.owner,
         }
     }

compiler/rustc_hir/src/intravisit.rs

@@ -912,7 +912,7 @@ pub fn walk_fn<'v, V: Visitor<'v>>(
 
 pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v TraitItem<'v>) {
     // N.B., deliberately force a compilation error if/when new fields are added.
-    let TraitItem { ident, generics, ref defaultness, ref kind, span, def_id: _ } = *trait_item;
+    let TraitItem { ident, generics, ref defaultness, ref kind, span, owner_id: _ } = *trait_item;
     let hir_id = trait_item.hir_id();
     visitor.visit_ident(ident);
     visitor.visit_generics(&generics);
@@ -952,7 +952,7 @@ pub fn walk_trait_item_ref<'v, V: Visitor<'v>>(visitor: &mut V, trait_item_ref:
 pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplItem<'v>) {
     // N.B., deliberately force a compilation error if/when new fields are added.
     let ImplItem {
-        def_id: _,
+        owner_id: _,
         ident,
         ref generics,
         ref kind,

compiler/rustc_hir/src/stable_hash_impls.rs

@@ -49,7 +49,7 @@ impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for ItemId {
 
     #[inline]
     fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
-        self.def_id.def_id.to_stable_hash_key(hcx)
+        self.owner_id.def_id.to_stable_hash_key(hcx)
     }
 }
 
@@ -58,7 +58,7 @@ impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for TraitItemId {
 
     #[inline]
     fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
-        self.def_id.def_id.to_stable_hash_key(hcx)
+        self.owner_id.def_id.to_stable_hash_key(hcx)
     }
 }
 
@@ -67,7 +67,7 @@ impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for ImplItemId {
 
     #[inline]
     fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
-        self.def_id.def_id.to_stable_hash_key(hcx)
+        self.owner_id.def_id.to_stable_hash_key(hcx)
     }
 }
 
@@ -76,7 +76,7 @@ impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for ForeignItemId
 
     #[inline]
     fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
-        self.def_id.def_id.to_stable_hash_key(hcx)
+        self.owner_id.def_id.to_stable_hash_key(hcx)
     }
 }