Particially revert #73771

src/librustdoc/clean/inline.rs

@@ -341,18 +341,6 @@ pub fn build_impl(
  return;
  }
  }
-
- // Skip foreign unstable traits from lists of trait implementations and
- // such. This helps prevent dependencies of the standard library, for
- // example, from getting documented as "traits `u32` implements" which
- // isn't really too helpful.
- if let Some(trait_did) = associated_trait {
- if let Some(stab) = cx.tcx.lookup_stability(trait_did.def_id) {
- if stab.level.is_unstable() {
- return;
- }
- }
- }
  }
 
  let for_ = if let Some(did) = did.as_local() {

src/test/rustdoc/auxiliary/all_unstable.rs

@@ -0,0 +1,12 @@
+#![crate_name = "unstabled"]
+#![feature(staged_api)]
+#![unstable(feature = "extremely_unstable", issue = "none")]
+
+#[unstable(feature = "extremely_unstable_foo", issue = "none")]
+pub struct Foo {}
+
+#[unstable(feature = "extremely_unstable_foo", issue = "none")]
+pub trait Join {}
+
+#[unstable(feature = "extremely_unstable_foo", issue = "none")]
+impl Join for Foo {}

src/test/rustdoc/issue-75588.rs

@@ -0,0 +1,11 @@
+// aux-build:all_unstable.rs
+
+// Ensure unstably exported traits have their Implementors sections.
+
+#![crate_name = "foo"]
+#![feature(extremely_unstable_foo)]
+
+extern crate unstabled;
+
+// @has foo/trait.Join.html '//*[@id="impl-Join-for-Foo"]//code' 'impl Join for Foo'
+pub use unstabled::Join;

src/tools/linkchecker/main.rs

@@ -42,6 +42,10 @@ const LINKCHECK_EXCEPTIONS: &[(&str, &[&str])] = &[
  "#method.get_unchecked_mut",
  ],
  ),
+ // FIXME(#74672): "Read more" is broken
+ ("std/primitive.usize.html", &["#tymethod.from_u64"]),
+ ("std/primitive.u32.html", &["#tymethod.from_u64"]),
+ ("std/primitive.u64.html", &["#tymethod.from_u64"]),
  // These try to link to std::collections, but are defined in alloc
  // https:/rust-lang/rust/issues/74481
  ("std/collections/btree_map/struct.BTreeMap.html", &["#insert-and-complex-keys"]),
@@ -142,6 +146,12 @@ fn is_exception(file: &Path, link: &str) -> bool {
  if let Some(entry) = LINKCHECK_EXCEPTIONS.iter().find(|&(f, _)| file.ends_with(f)) {
  entry.1.contains(&link)
  } else {
+ // FIXME(#63351): Concat trait in alloc/slice reexported in primitive page
+ if file.ends_with("std/primitive.slice.html") {
+ if link.ends_with("std/primitive.slice.html") {
+ return true;
+ }
+ }
  false
  }
 }