Auto merge of #94265 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum 1.59.0

[stable] 1.59.0 artifacts (second round)

This backports (from 1.60, landed in #93001):

*  Move return_self_not_must_use to pedantic rust-lang/rust-clippy#8302

Per a user report on the internals feedback thread, this lint is not behaving well in 1.59.

cc `@rust-lang/clippy` -- this is a stable backport of a patch, which we'll likely want to land in fairly short order to be in time for the release Thursday.

This PR also includes an adjustment to the release notes to reflect "Fix invalid special casing of the unreachable! macro #93179".

r? `@Mark-Simulacrum`

7 files changed, 7 insertions, 6 deletions

diff --git a/RELEASES.md b/RELEASES.md
index 2bf212123d4..37b41d26422 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -101,6 +101,7 @@ Compatibility Notes
 - [Weaken guarantee around advancing underlying iterators in zip][83791]
 - [Make split_inclusive() on an empty slice yield an empty output][89825]
 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
+- [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
 
 Internal Changes
 ----------------
diff --git a/src/tools/clippy/clippy_lints/src/lib.register_all.rs b/src/tools/clippy/clippy_lints/src/lib.register_all.rs
index 944411087e9..11ed97d3e19 100644
--- a/src/tools/clippy/clippy_lints/src/lib.register_all.rs
+++ b/src/tools/clippy/clippy_lints/src/lib.register_all.rs
@@ -247,7 +247,6 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(reference::REF_IN_DEREF),
     LintId::of(regex::INVALID_REGEX),
     LintId::of(repeat_once::REPEAT_ONCE),
-    LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
     LintId::of(returns::LET_AND_RETURN),
     LintId::of(returns::NEEDLESS_RETURN),
     LintId::of(self_assignment::SELF_ASSIGNMENT),
diff --git a/src/tools/clippy/clippy_lints/src/lib.register_pedantic.rs b/src/tools/clippy/clippy_lints/src/lib.register_pedantic.rs
index 70a4a624378..a82ec73935f 100644
--- a/src/tools/clippy/clippy_lints/src/lib.register_pedantic.rs
+++ b/src/tools/clippy/clippy_lints/src/lib.register_pedantic.rs
@@ -80,6 +80,7 @@ store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
     LintId::of(ranges::RANGE_PLUS_ONE),
     LintId::of(redundant_else::REDUNDANT_ELSE),
     LintId::of(ref_option_ref::REF_OPTION_REF),
+    LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
     LintId::of(semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED),
     LintId::of(strings::STRING_ADD_ASSIGN),
     LintId::of(trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS),
diff --git a/src/tools/clippy/clippy_lints/src/lib.register_suspicious.rs b/src/tools/clippy/clippy_lints/src/lib.register_suspicious.rs
index 8594338ffa5..10f8ae4b7f7 100644
--- a/src/tools/clippy/clippy_lints/src/lib.register_suspicious.rs
+++ b/src/tools/clippy/clippy_lints/src/lib.register_suspicious.rs
@@ -16,7 +16,6 @@ store.register_group(true, "clippy::suspicious", Some("clippy_suspicious"), vec!
     LintId::of(methods::SUSPICIOUS_MAP),
     LintId::of(mut_key::MUTABLE_KEY_TYPE),
     LintId::of(octal_escapes::OCTAL_ESCAPES),
-    LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
     LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
     LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
 ])
diff --git a/src/tools/clippy/clippy_lints/src/return_self_not_must_use.rs b/src/tools/clippy/clippy_lints/src/return_self_not_must_use.rs
index b57ec96bc7e..2be71c7e973 100644
--- a/src/tools/clippy/clippy_lints/src/return_self_not_must_use.rs
+++ b/src/tools/clippy/clippy_lints/src/return_self_not_must_use.rs
@@ -38,7 +38,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.59.0"]
     pub RETURN_SELF_NOT_MUST_USE,
-    suspicious,
+    pedantic,
     "missing `#[must_use]` annotation on a method returning `Self`"
 }
 
diff --git a/src/tools/clippy/tests/ui/return_self_not_must_use.rs b/src/tools/clippy/tests/ui/return_self_not_must_use.rs
index 7dd5742dae9..9b33ad6d3f6 100644
--- a/src/tools/clippy/tests/ui/return_self_not_must_use.rs
+++ b/src/tools/clippy/tests/ui/return_self_not_must_use.rs
@@ -1,4 +1,5 @@
 #![crate_type = "lib"]
+#![warn(clippy::return_self_not_must_use)]
 
 #[derive(Clone)]
 pub struct Bar;
diff --git a/src/tools/clippy/tests/ui/return_self_not_must_use.stderr b/src/tools/clippy/tests/ui/return_self_not_must_use.stderr
index 3793a5559ba..63a365fe080 100644
--- a/src/tools/clippy/tests/ui/return_self_not_must_use.stderr
+++ b/src/tools/clippy/tests/ui/return_self_not_must_use.stderr
@@ -1,5 +1,5 @@
 error: missing `#[must_use]` attribute on a method returning `Self`
-  --> $DIR/return_self_not_must_use.rs:7:5
+  --> $DIR/return_self_not_must_use.rs:8:5
    |
 LL |     fn what(&self) -> Self;
    |     ^^^^^^^^^^^^^^^^^^^^^^^
@@ -7,7 +7,7 @@ LL |     fn what(&self) -> Self;
    = note: `-D clippy::return-self-not-must-use` implied by `-D warnings`
 
 error: missing `#[must_use]` attribute on a method returning `Self`
-  --> $DIR/return_self_not_must_use.rs:17:5
+  --> $DIR/return_self_not_must_use.rs:18:5
    |
 LL | /     pub fn foo(&self) -> Self {
 LL | |         Self
@@ -15,7 +15,7 @@ LL | |     }
    | |_____^
 
 error: missing `#[must_use]` attribute on a method returning `Self`
-  --> $DIR/return_self_not_must_use.rs:20:5
+  --> $DIR/return_self_not_must_use.rs:21:5
    |
 LL | /     pub fn bar(self) -> Self {
 LL | |         self