Rollup merge of rust-lang#93746 - cjgillot:nodefii, r=nikomatsakis

Remove defaultness from ImplItem.

This information is not really used anywhere, except HIR pretty-printing. This makes ImplItem and TraitItem more similar.

Author: JohnTitor

compiler/rustc_ast_lowering/src/item.rs

@@ -894,17 +894,13 @@ impl<'hir> LoweringContext<'_, 'hir> {
             AssocItemKind::MacCall(..) => panic!("`TyMac` should have been expanded by now"),
         };
 
-        // Since `default impl` is not yet implemented, this is always true in impls.
-        let has_value = true;
-        let (defaultness, _) = self.lower_defaultness(i.kind.defaultness(), has_value);
         let hir_id = self.lower_node_id(i.id);
         self.lower_attrs(hir_id, &i.attrs);
         let item = hir::ImplItem {
             def_id: hir_id.expect_owner(),
             ident: self.lower_ident(i.ident),
             generics,
             vis: self.lower_visibility(&i.vis),
-            defaultness,
             kind,
             span: self.lower_span(i.span),
         };

compiler/rustc_hir/src/hir.rs

@@ -2112,7 +2112,6 @@ pub struct ImplItem<'hir> {
     pub ident: Ident,
     pub def_id: LocalDefId,
     pub vis: Visibility<'hir>,
-    pub defaultness: Defaultness,
     pub generics: Generics<'hir>,
     pub kind: ImplItemKind<'hir>,
     pub span: Span,
@@ -3310,6 +3309,6 @@ mod size_asserts {
 
     rustc_data_structures::static_assert_size!(super::Item<'static>, 184);
     rustc_data_structures::static_assert_size!(super::TraitItem<'static>, 128);
-    rustc_data_structures::static_assert_size!(super::ImplItem<'static>, 152);
+    rustc_data_structures::static_assert_size!(super::ImplItem<'static>, 144);
     rustc_data_structures::static_assert_size!(super::ForeignItem<'static>, 136);
 }

compiler/rustc_hir/src/intravisit.rs

@@ -1020,12 +1020,10 @@ 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: _, ident, ref vis, ref defaultness, ref generics, ref kind, span: _ } =
-        *impl_item;
+    let ImplItem { def_id: _, ident, ref vis, ref generics, ref kind, span: _ } = *impl_item;
 
     visitor.visit_ident(ident);
     visitor.visit_vis(vis);
-    visitor.visit_defaultness(defaultness);
     visitor.visit_generics(generics);
     match *kind {
         ImplItemKind::Const(ref ty, body) => {

compiler/rustc_hir/src/stable_hash_impls.rs

@@ -164,13 +164,11 @@ impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItem<'_> {
 
 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItem<'_> {
     fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
-        let ImplItem { def_id: _, ident, ref vis, defaultness, ref generics, ref kind, span } =
-            *self;
+        let ImplItem { def_id: _, ident, ref vis, ref generics, ref kind, span } = *self;
 
         hcx.hash_hir_item_like(|hcx| {
             ident.name.hash_stable(hcx, hasher);
             vis.hash_stable(hcx, hasher);
-            defaultness.hash_stable(hcx, hasher);
             generics.hash_stable(hcx, hasher);
             kind.hash_stable(hcx, hasher);
             span.hash_stable(hcx, hasher);

compiler/rustc_hir_pretty/src/lib.rs

@@ -923,7 +923,6 @@ impl<'a> State<'a> {
         self.hardbreak_if_not_bol();
         self.maybe_print_comment(ii.span.lo());
         self.print_outer_attributes(self.attrs(ii.hir_id()));
-        self.print_defaultness(ii.defaultness);
 
         match ii.kind {
             hir::ImplItemKind::Const(ref ty, expr) => {

src/librustdoc/clean/mod.rs

@@ -1015,7 +1015,8 @@ impl Clean<Item> for hir::ImplItem<'_> {
                     {
                         m.header.constness = hir::Constness::NotConst;
                     }
-                    MethodItem(m, Some(self.defaultness))
+                    let defaultness = cx.tcx.associated_item(self.def_id).defaultness;
+                    MethodItem(m, Some(defaultness))
                 }
                 hir::ImplItemKind::TyAlias(ref hir_ty) => {
                     let type_ = hir_ty.clean(cx);

src/test/incremental/hashes/trait_impls.rs

@@ -358,9 +358,11 @@ pub trait AddDefaultTrait {
 
 #[cfg(any(cfail1,cfail4))]
 impl AddDefaultTrait for Foo {
-    // -------------------------------------------------------------------------------------------
+    // ----------------------------------------------------
     // -------------------------
-            fn method_name() { }
+    // ----------------------------------------------------
+    // -------------------------
+    fn         method_name() { }
 }
 
 #[cfg(not(any(cfail1,cfail4)))]
@@ -369,9 +371,9 @@ impl AddDefaultTrait for Foo {
 #[rustc_clean(except="hir_owner,hir_owner_nodes", cfg="cfail5")]
 #[rustc_clean(cfg="cfail6")]
 impl AddDefaultTrait for Foo {
-    #[rustc_clean(except="hir_owner,hir_owner_nodes,associated_item", cfg="cfail2")]
+    #[rustc_clean(except="associated_item", cfg="cfail2")]
     #[rustc_clean(cfg="cfail3")]
-    #[rustc_clean(except="hir_owner,hir_owner_nodes,associated_item,optimized_mir", cfg="cfail5")]
+    #[rustc_clean(except="associated_item", cfg="cfail5")]
     #[rustc_clean(cfg="cfail6")]
     default fn method_name() { }
 }

src/tools/clippy/clippy_lints/src/utils/inspector.rs

@@ -54,9 +54,6 @@ impl<'tcx> LateLintPass<'tcx> for DeepCodeInspector {
             ),
             hir::VisibilityKind::Inherited => println!("visibility inherited from outer item"),
         }
-        if item.defaultness.is_default() {
-            println!("default");
-        }
         match item.kind {
             hir::ImplItemKind::Const(_, body_id) => {
                 println!("associated constant");