chore(rustdoc): remove unused members of RenderType

Commit e629381653 removes the only place
these members variables are actually read.

src/librustdoc/formats/cache.rs

@@ -128,7 +128,6 @@ crate struct Cache {
 /// This struct is used to wrap the `cache` and `tcx` in order to run `DocFolder`.
 struct CacheBuilder<'a, 'tcx> {
     cache: &'a mut Cache,
-    empty_cache: Cache,
     tcx: TyCtxt<'tcx>,
 }
 
@@ -173,7 +172,7 @@ impl Cache {
             self.primitive_locations.insert(prim, def_id);
         }
 
-        krate = CacheBuilder { tcx, cache: self, empty_cache: Cache::default() }.fold_crate(krate);
+        krate = CacheBuilder { tcx, cache: self }.fold_crate(krate);
 
         for (trait_did, dids, impl_) in self.orphan_trait_impls.drain(..) {
             if self.traits.contains_key(&trait_did) {
@@ -302,7 +301,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
                             desc,
                             parent,
                             parent_idx: None,
-                            search_type: get_index_search_type(&item, &self.empty_cache, self.tcx),
+                            search_type: get_index_search_type(&item, self.tcx),
                             aliases: item.attrs.get_doc_aliases(),
                         });
                     }

src/librustdoc/html/render/cache.rs

@@ -12,7 +12,7 @@ use crate::clean::types::{
 use crate::formats::cache::Cache;
 use crate::formats::item_type::ItemType;
 use crate::html::markdown::short_markdown_summary;
-use crate::html::render::{Generic, IndexItem, IndexItemFunctionType, RenderType, TypeWithKind};
+use crate::html::render::{IndexItem, IndexItemFunctionType, RenderType, TypeWithKind};
 
 /// Indicates where an external crate can be found.
 crate enum ExternalLocation {
@@ -44,7 +44,7 @@ crate fn build_index<'tcx>(krate: &clean::Crate, cache: &mut Cache, tcx: TyCtxt<
                 desc,
                 parent: Some(did.into()),
                 parent_idx: None,
-                search_type: get_index_search_type(&item, cache, tcx),
+                search_type: get_index_search_type(&item, tcx),
                 aliases: item.attrs.get_doc_aliases(),
             });
         }
@@ -192,7 +192,6 @@ crate fn build_index<'tcx>(krate: &clean::Crate, cache: &mut Cache, tcx: TyCtxt<
 
 crate fn get_index_search_type<'tcx>(
     item: &clean::Item,
-    cache: &Cache,
     tcx: TyCtxt<'tcx>,
 ) -> Option<IndexItemFunctionType> {
     let (all_types, ret_types) = match *item.kind {
@@ -204,12 +203,12 @@ crate fn get_index_search_type<'tcx>(
 
     let inputs = all_types
         .iter()
-        .map(|(ty, kind)| TypeWithKind::from((get_index_type(&ty, &cache), *kind)))
+        .map(|(ty, kind)| TypeWithKind::from((get_index_type(&ty), *kind)))
         .filter(|a| a.ty.name.is_some())
         .collect();
     let output = ret_types
         .iter()
-        .map(|(ty, kind)| TypeWithKind::from((get_index_type(&ty, &cache), *kind)))
+        .map(|(ty, kind)| TypeWithKind::from((get_index_type(&ty), *kind)))
         .filter(|a| a.ty.name.is_some())
         .collect::<Vec<_>>();
     let output = if output.is_empty() { None } else { Some(output) };
@@ -217,12 +216,9 @@ crate fn get_index_search_type<'tcx>(
     Some(IndexItemFunctionType { inputs, output })
 }
 
-fn get_index_type(clean_type: &clean::Type, cache: &Cache) -> RenderType {
+fn get_index_type(clean_type: &clean::Type) -> RenderType {
     RenderType {
-        ty: clean_type.def_id_full(cache),
-        idx: None,
         name: get_index_type_name(clean_type, true).map(|s| s.as_str().to_ascii_lowercase()),
-        generics: get_generics(clean_type, cache),
     }
 }
 
@@ -254,22 +250,6 @@ fn get_index_type_name(clean_type: &clean::Type, accept_generic: bool) -> Option
     }
 }
 
-fn get_generics(clean_type: &clean::Type, cache: &Cache) -> Option<Vec<Generic>> {
-    clean_type.generics().and_then(|types| {
-        let r = types
-            .iter()
-            .filter_map(|t| {
-                get_index_type_name(t, false).map(|name| Generic {
-                    name: name.as_str().to_ascii_lowercase(),
-                    defid: t.def_id_full(cache),
-                    idx: None,
-                })
-            })
-            .collect::<Vec<_>>();
-        if r.is_empty() { None } else { Some(r) }
-    })
-}
-
 /// The point of this function is to replace bounds with types.
 ///
 /// i.e. `[T, U]` when you have the following bounds: `T: Display, U: Option<T>` will return

src/librustdoc/html/render/mod.rs

@@ -95,31 +95,7 @@ crate struct IndexItem {
 /// A type used for the search index.
 #[derive(Debug)]
 crate struct RenderType {
-    ty: Option<DefId>,
-    idx: Option<usize>,
     name: Option<String>,
-    generics: Option<Vec<Generic>>,
-}
-
-/// A type used for the search index.
-#[derive(Debug)]
-crate struct Generic {
-    name: String,
-    defid: Option<DefId>,
-    idx: Option<usize>,
-}
-
-impl Serialize for Generic {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        if let Some(id) = self.idx {
-            serializer.serialize_some(&id)
-        } else {
-            serializer.serialize_some(&self.name)
-        }
-    }
 }
 
 /// Full type of functions/methods in the search index.