Rollup merge of #104984 - GuillaumeGomez:remote-crate-primitives, r=notriddle

Remove Crate::primitives field

It is a new approach to #90447. Instead of removing primitives from everywhere (ie from `BadImplStripper`), I just removed them from the `Crate` type, allowing to reduce its size.

cc `@camelid`
r? `@notriddle`

src/librustdoc/clean/types.rs

@@ -115,7 +115,6 @@ impl From<DefId> for ItemId {
 #[derive(Clone, Debug)]
 pub(crate) struct Crate {
     pub(crate) module: Item,
-    pub(crate) primitives: ThinVec<(DefId, PrimitiveType)>,
     /// Only here so that they can be filtered through the rustdoc passes.
     pub(crate) external_traits: Rc<RefCell<FxHashMap<DefId, Trait>>>,
 }
@@ -2572,7 +2571,7 @@ mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
     // tidy-alphabetical-start
-    static_assert_size!(Crate, 72); // frequently moved by-value
+    static_assert_size!(Crate, 64); // frequently moved by-value
     static_assert_size!(DocFragment, 32);
     static_assert_size!(GenericArg, 32);
     static_assert_size!(GenericArgs, 32);

src/librustdoc/clean/utils.rs

@@ -73,7 +73,7 @@ pub(crate) fn krate(cx: &mut DocContext<'_>) -> Crate {
         }));
     }
 
-    Crate { module, primitives, external_traits: cx.external_traits.clone() }
+    Crate { module, external_traits: cx.external_traits.clone() }
 }
 
 pub(crate) fn substs_to_args<'tcx>(

src/librustdoc/passes/collect_trait_impls.rs

@@ -8,7 +8,7 @@ use crate::formats::cache::Cache;
 use crate::visit::DocVisitor;
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_middle::ty::{self, DefIdTree};
 use rustc_span::symbol::sym;
 
@@ -25,7 +25,9 @@ pub(crate) fn collect_trait_impls(mut krate: Crate, cx: &mut DocContext<'_>) ->
         synth.impls
     });
 
-    let prims: FxHashSet<PrimitiveType> = krate.primitives.iter().map(|p| p.1).collect();
+    let local_crate = ExternalCrate { crate_num: LOCAL_CRATE };
+    let prims: FxHashSet<PrimitiveType> =
+        local_crate.primitives(cx.tcx).iter().map(|p| p.1).collect();
 
     let crate_items = {
         let mut coll = ItemCollector::new();

src/test/rustdoc/deref-to-primitive.rs

@@ -0,0 +1,15 @@
+#![crate_name = "foo"]
+
+// @has 'foo/struct.Foo.html'
+// @has - '//*[@id="deref-methods-i32"]' 'Methods from Deref<Target = i32>'
+// @has - '//*[@id="deref-methods-i32-1"]//*[@id="associatedconstant.BITS"]/h4' \
+//        'pub const BITS: u32 = 32u32'
+pub struct Foo(i32);
+
+impl std::ops::Deref for Foo {
+    type Target = i32;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}