Rollup merge of #121720 - tmandry:split-refining, r=compiler-errors

Split refining_impl_trait lint into _reachable, _internal variants

As discussed in https://github.com/rust-lang/rust/issues/119535#issuecomment-1909352040:

> We discussed this today in triage and developed a consensus to:
>
> * Add a separate lint against impls that refine a return type defined with RPITIT even when the trait is not crate public.
> * Place that in a lint group along with the analogous crate public lint.
> * Create an issue to solicit feedback on these lints (or perhaps two separate ones).
> * Have the warnings displayed with each lint reference this issue in a similar manner to how we do that today with the required `Self: '0'` bound on GATs.
> * Make a note to review this feedback on 2-3 release cycles.

This points users to https://github.com/rust-lang/rust/issues/121718 to leave feedback.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/tools/lint-docs/src/groups.rs b/src/tools/lint-docs/src/groups.rs
index c5cd30ccc34..0c39f2fa601 100644
--- a/src/tools/lint-docs/src/groups.rs
+++ b/src/tools/lint-docs/src/groups.rs
@@ -16,6 +16,10 @@ static GROUP_DESCRIPTIONS: &[(&str, &str)] = &[
     ("rust-2018-compatibility", "Lints used to transition code from the 2015 edition to 2018"),
     ("rust-2021-compatibility", "Lints used to transition code from the 2018 edition to 2021"),
     ("rust-2024-compatibility", "Lints used to transition code from the 2021 edition to 2024"),
+    (
+        "refining-impl-trait",
+        "Detects refinement of `impl Trait` return types by trait implementations",
+    ),
 ];
 
 type LintGroups = BTreeMap<String, BTreeSet<String>>;