Get rid of fake DefIds in rustdoc

compiler/rustc_hir/src/definitions.rs

@@ -87,11 +87,6 @@ impl DefPathTable {
         hash
     }
 
-    /// Used by librustdoc for fake DefIds.
-    pub fn num_def_ids(&self) -> usize {
-        self.index_to_key.len()
-    }
-
     pub fn enumerated_keys_and_path_hashes(
         &self,
     ) -> impl Iterator<Item = (DefIndex, &DefKey, &DefPathHash)> + '_ {

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -1885,10 +1885,6 @@ impl CrateMetadata {
         self.root.hash
     }
 
-    fn num_def_ids(&self) -> usize {
-        self.root.tables.def_keys.size()
-    }
-
     fn local_def_id(&self, index: DefIndex) -> DefId {
         DefId { krate: self.cnum, index }
     }

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -461,10 +461,6 @@ impl CStore {
         self.get_crate_data(def_id.krate).module_expansion(def_id.index, sess)
     }
 
-    pub fn num_def_ids(&self, cnum: CrateNum) -> usize {
-        self.get_crate_data(cnum).num_def_ids()
-    }
-
     pub fn item_attrs(&self, def_id: DefId, sess: &Session) -> Vec<ast::Attribute> {
         self.get_crate_data(def_id.krate).get_item_attrs(def_id.index, sess).collect()
     }

src/librustdoc/clean/auto_trait.rs

@@ -113,7 +113,7 @@ impl<'a, 'tcx> AutoTraitFinder<'a, 'tcx> {
             name: None,
             attrs: Default::default(),
             visibility: Inherited,
-            def_id: self.cx.next_def_id(item_def_id.krate),
+            def_id: FakeDefId::new_fake(item_def_id.krate),
             kind: box ImplItem(Impl {
                 span: Span::dummy(),
                 unsafety: hir::Unsafety::Normal,

src/librustdoc/clean/blanket_impl.rs

@@ -97,7 +97,7 @@ impl<'a, 'tcx> BlanketImplFinder<'a, 'tcx> {
                     name: None,
                     attrs: Default::default(),
                     visibility: Inherited,
-                    def_id: self.cx.next_def_id(impl_def_id.krate),
+                    def_id: FakeDefId::new_fake(item_def_id.krate),
                     kind: box ImplItem(Impl {
                         span: self.cx.tcx.def_span(impl_def_id).clean(self.cx),
                         unsafety: hir::Unsafety::Normal,

src/librustdoc/clean/inline.rs

@@ -15,7 +15,7 @@ use rustc_span::hygiene::MacroKind;
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::Span;
 
-use crate::clean::{self, Attributes, AttributesExt, GetDefId, ToSource};
+use crate::clean::{self, Attributes, AttributesExt, FakeDefId, GetDefId, ToSource};
 use crate::core::DocContext;
 use crate::formats::item_type::ItemType;
 
@@ -121,7 +121,7 @@ crate fn try_inline(
     };
 
     let (attrs, cfg) = merge_attrs(cx, Some(parent_module), load_attrs(cx, did), attrs_clone);
-    cx.inlined.insert(did);
+    cx.inlined.insert(did.into());
     ret.push(clean::Item::from_def_id_and_attrs_and_parts(
         did,
         Some(name),
@@ -332,7 +332,7 @@ crate fn build_impl(
     attrs: Option<Attrs<'_>>,
     ret: &mut Vec<clean::Item>,
 ) {
-    if !cx.inlined.insert(did) {
+    if !cx.inlined.insert(did.into()) {
         return;
     }
 
@@ -470,7 +470,7 @@ fn build_module(
                 items.push(clean::Item {
                     name: None,
                     attrs: box clean::Attributes::default(),
-                    def_id: cx.next_def_id(did.krate),
+                    def_id: FakeDefId::new_fake(did.krate),
                     visibility: clean::Public,
                     kind: box clean::ImportItem(clean::Import::new_simple(
                         item.ident.name,

src/librustdoc/clean/mod.rs

@@ -533,7 +533,8 @@ impl Clean<Generics> for hir::Generics<'_> {
                 match param.kind {
                     GenericParamDefKind::Lifetime => unreachable!(),
                     GenericParamDefKind::Type { did, ref bounds, .. } => {
-                        cx.impl_trait_bounds.insert(did.into(), bounds.clone());
+                        cx.impl_trait_bounds
+                            .insert(FakeDefId::new_real(did).into(), bounds.clone());
                     }
                     GenericParamDefKind::Const { .. } => unreachable!(),
                 }
@@ -614,7 +615,7 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics, ty::GenericPredicates<'tcx
             .collect::<Vec<GenericParamDef>>();
 
         // param index -> [(DefId of trait, associated type name, type)]
-        let mut impl_trait_proj = FxHashMap::<u32, Vec<(DefId, Symbol, Ty<'tcx>)>>::default();
+        let mut impl_trait_proj = FxHashMap::<u32, Vec<(FakeDefId, Symbol, Ty<'tcx>)>>::default();
 
         let where_predicates = preds
             .predicates
@@ -663,10 +664,11 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics, ty::GenericPredicates<'tcx
                         if let Some(((_, trait_did, name), rhs)) =
                             proj.as_ref().and_then(|(lhs, rhs)| Some((lhs.projection()?, rhs)))
                         {
-                            impl_trait_proj
-                                .entry(param_idx)
-                                .or_default()
-                                .push((trait_did, name, rhs));
+                            impl_trait_proj.entry(param_idx).or_default().push((
+                                trait_did.into(),
+                                name,
+                                rhs,
+                            ));
                         }
 
                         return None;
@@ -685,7 +687,13 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics, ty::GenericPredicates<'tcx
                 if let Some(proj) = impl_trait_proj.remove(&idx) {
                     for (trait_did, name, rhs) in proj {
                         let rhs = rhs.clean(cx);
-                        simplify::merge_bounds(cx, &mut bounds, trait_did, name, &rhs);
+                        simplify::merge_bounds(
+                            cx,
+                            &mut bounds,
+                            trait_did.expect_real(),
+                            name,
+                            &rhs,
+                        );
                     }
                 }
             } else {
@@ -1175,7 +1183,8 @@ fn clean_qpath(hir_ty: &hir::Ty<'_>, cx: &mut DocContext<'_>) -> Type {
                 if let Some(new_ty) = cx.ty_substs.get(&did).cloned() {
                     return new_ty;
                 }
-                if let Some(bounds) = cx.impl_trait_bounds.remove(&did.into()) {
+                if let Some(bounds) = cx.impl_trait_bounds.remove(&FakeDefId::new_real(did).into())
+                {
                     return ImplTrait(bounds);
                 }
             }
@@ -2006,7 +2015,7 @@ fn clean_extern_crate(
     vec![Item {
         name: Some(name),
         attrs: box attrs.clean(cx),
-        def_id: crate_def_id,
+        def_id: crate_def_id.into(),
         visibility: krate.vis.clean(cx),
         kind: box ExternCrateItem { src: orig_name },
         cfg: attrs.cfg(cx.sess().diagnostic()),