diff --git a/clippy_lints/src/declared_lints.rs b/clippy_lints/src/declared_lints.rs
index aee43edc478..423eee47742 100644
--- a/clippy_lints/src/declared_lints.rs
+++ b/clippy_lints/src/declared_lints.rs
@@ -134,12 +134,8 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::doc::NEEDLESS_DOCTEST_MAIN_INFO,
     crate::doc::UNNECESSARY_SAFETY_DOC_INFO,
     crate::double_parens::DOUBLE_PARENS_INFO,
-    crate::drop_forget_ref::DROP_COPY_INFO,
     crate::drop_forget_ref::DROP_NON_DROP_INFO,
-    crate::drop_forget_ref::DROP_REF_INFO,
-    crate::drop_forget_ref::FORGET_COPY_INFO,
     crate::drop_forget_ref::FORGET_NON_DROP_INFO,
-    crate::drop_forget_ref::FORGET_REF_INFO,
     crate::drop_forget_ref::UNDROPPED_MANUALLY_DROPS_INFO,
     crate::duplicate_mod::DUPLICATE_MOD_INFO,
     crate::else_if_without_else::ELSE_IF_WITHOUT_ELSE_INFO,
diff --git a/clippy_lints/src/dereference.rs b/clippy_lints/src/dereference.rs
index 7f3f26bed7c..b27ffe73ffd 100644
--- a/clippy_lints/src/dereference.rs
+++ b/clippy_lints/src/dereference.rs
@@ -1424,6 +1424,7 @@ fn ty_auto_deref_stability<'tcx>(
                 continue;
             },
             ty::Param(_) => TyPosition::new_deref_stable_for_result(precedence, ty),
+            ty::Alias(ty::Inherent, _) => unreachable!("inherent projection should have been normalized away above"),
             ty::Alias(ty::Projection, _) if ty.has_non_region_param() => {
                 TyPosition::new_deref_stable_for_result(precedence, ty)
             },
diff --git a/clippy_lints/src/drop_forget_ref.rs b/clippy_lints/src/drop_forget_ref.rs
index 11e1bcdf12d..b2f7d026cc8 100644
--- a/clippy_lints/src/drop_forget_ref.rs
+++ b/clippy_lints/src/drop_forget_ref.rs
@@ -7,102 +7,6 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::sym;
 
-declare_clippy_lint! {
-    /// ### What it does
-    /// Checks for calls to `std::mem::drop` with a reference
-    /// instead of an owned value.
-    ///
-    /// ### Why is this bad?
-    /// Calling `drop` on a reference will only drop the
-    /// reference itself, which is a no-op. It will not call the `drop` method (from
-    /// the `Drop` trait implementation) on the underlying referenced value, which
-    /// is likely what was intended.
-    ///
-    /// ### Example
-    /// ```ignore
-    /// let mut lock_guard = mutex.lock();
-    /// std::mem::drop(&lock_guard) // Should have been drop(lock_guard), mutex
-    /// // still locked
-    /// operation_that_requires_mutex_to_be_unlocked();
-    /// ```
-    #[clippy::version = "pre 1.29.0"]
-    pub DROP_REF,
-    correctness,
-    "calls to `std::mem::drop` with a reference instead of an owned value"
-}
-
-declare_clippy_lint! {
-    /// ### What it does
-    /// Checks for calls to `std::mem::forget` with a reference
-    /// instead of an owned value.
-    ///
-    /// ### Why is this bad?
-    /// Calling `forget` on a reference will only forget the
-    /// reference itself, which is a no-op. It will not forget the underlying
-    /// referenced
-    /// value, which is likely what was intended.
-    ///
-    /// ### Example
-    /// ```rust
-    /// let x = Box::new(1);
-    /// std::mem::forget(&x) // Should have been forget(x), x will still be dropped
-    /// ```
-    #[clippy::version = "pre 1.29.0"]
-    pub FORGET_REF,
-    correctness,
-    "calls to `std::mem::forget` with a reference instead of an owned value"
-}
-
-declare_clippy_lint! {
-    /// ### What it does
-    /// Checks for calls to `std::mem::drop` with a value
-    /// that derives the Copy trait
-    ///
-    /// ### Why is this bad?
-    /// Calling `std::mem::drop` [does nothing for types that
-    /// implement Copy](https://doc.rust-lang.org/std/mem/fn.drop.html), since the
-    /// value will be copied and moved into the function on invocation.
-    ///
-    /// ### Example
-    /// ```rust
-    /// let x: i32 = 42; // i32 implements Copy
-    /// std::mem::drop(x) // A copy of x is passed to the function, leaving the
-    ///                   // original unaffected
-    /// ```
-    #[clippy::version = "pre 1.29.0"]
-    pub DROP_COPY,
-    correctness,
-    "calls to `std::mem::drop` with a value that implements Copy"
-}
-
-declare_clippy_lint! {
-    /// ### What it does
-    /// Checks for calls to `std::mem::forget` with a value that
-    /// derives the Copy trait
-    ///
-    /// ### Why is this bad?
-    /// Calling `std::mem::forget` [does nothing for types that
-    /// implement Copy](https://doc.rust-lang.org/std/mem/fn.drop.html) since the
-    /// value will be copied and moved into the function on invocation.
-    ///
-    /// An alternative, but also valid, explanation is that Copy types do not
-    /// implement
-    /// the Drop trait, which means they have no destructors. Without a destructor,
-    /// there
-    /// is nothing for `std::mem::forget` to ignore.
-    ///
-    /// ### Example
-    /// ```rust
-    /// let x: i32 = 42; // i32 implements Copy
-    /// std::mem::forget(x) // A copy of x is passed to the function, leaving the
-    ///                     // original unaffected
-    /// ```
-    #[clippy::version = "pre 1.29.0"]
-    pub FORGET_COPY,
-    correctness,
-    "calls to `std::mem::forget` with a value that implements Copy"
-}
-
 declare_clippy_lint! {
     /// ### What it does
     /// Checks for calls to `std::mem::drop` with a value that does not implement `Drop`.
@@ -172,24 +76,12 @@ declare_clippy_lint! {
     "use of safe `std::mem::drop` function to drop a std::mem::ManuallyDrop, which will not drop the inner value"
 }
 
-const DROP_REF_SUMMARY: &str = "calls to `std::mem::drop` with a reference instead of an owned value. \
-                                Dropping a reference does nothing";
-const FORGET_REF_SUMMARY: &str = "calls to `std::mem::forget` with a reference instead of an owned value. \
-                                  Forgetting a reference does nothing";
-const DROP_COPY_SUMMARY: &str = "calls to `std::mem::drop` with a value that implements `Copy`. \
-                                 Dropping a copy leaves the original intact";
-const FORGET_COPY_SUMMARY: &str = "calls to `std::mem::forget` with a value that implements `Copy`. \
-                                   Forgetting a copy leaves the original intact";
 const DROP_NON_DROP_SUMMARY: &str = "call to `std::mem::drop` with a value that does not implement `Drop`. \
                                  Dropping such a type only extends its contained lifetimes";
 const FORGET_NON_DROP_SUMMARY: &str = "call to `std::mem::forget` with a value that does not implement `Drop`. \
                                    Forgetting such a type is the same as dropping it";
 
 declare_lint_pass!(DropForgetRef => [
-    DROP_REF,
-    FORGET_REF,
-    DROP_COPY,
-    FORGET_COPY,
     DROP_NON_DROP,
     FORGET_NON_DROP,
     UNDROPPED_MANUALLY_DROPS
@@ -206,10 +98,11 @@ impl<'tcx> LateLintPass<'tcx> for DropForgetRef {
             let is_copy = is_copy(cx, arg_ty);
             let drop_is_single_call_in_arm = is_single_call_in_arm(cx, arg, expr);
             let (lint, msg) = match fn_name {
-                sym::mem_drop if arg_ty.is_ref() && !drop_is_single_call_in_arm => (DROP_REF, DROP_REF_SUMMARY),
-                sym::mem_forget if arg_ty.is_ref() => (FORGET_REF, FORGET_REF_SUMMARY),
-                sym::mem_drop if is_copy && !drop_is_single_call_in_arm => (DROP_COPY, DROP_COPY_SUMMARY),
-                sym::mem_forget if is_copy => (FORGET_COPY, FORGET_COPY_SUMMARY),
+                // early return for uplifted lints: drop_ref, drop_copy, forget_ref, forget_copy
+                sym::mem_drop if arg_ty.is_ref() && !drop_is_single_call_in_arm => return,
+                sym::mem_forget if arg_ty.is_ref() => return,
+                sym::mem_drop if is_copy && !drop_is_single_call_in_arm => return,
+                sym::mem_forget if is_copy => return,
                 sym::mem_drop if is_type_lang_item(cx, arg_ty, LangItem::ManuallyDrop) => {
                     span_lint_and_help(
                         cx,
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 38f4ecc75b6..b442a4ac5f6 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -392,7 +392,7 @@ pub fn read_conf(sess: &Session, path: &io::Result<(Option<PathBuf>, Vec<String>
     conf
 }
 
-#[derive(Default)] //~ ERROR no such field
+#[derive(Default)]
 struct RegistrationGroups {
     all: Vec<LintId>,
     cargo: Vec<LintId>,
diff --git a/clippy_lints/src/matches/match_same_arms.rs b/clippy_lints/src/matches/match_same_arms.rs
index 158e6caa4de..ae8262ace96 100644
--- a/clippy_lints/src/matches/match_same_arms.rs
+++ b/clippy_lints/src/matches/match_same_arms.rs
@@ -282,7 +282,7 @@ impl<'a> NormalizedPat<'a> {
                 // TODO: Handle negative integers. They're currently treated as a wild match.
                 ExprKind::Lit(lit) => match lit.node {
                     LitKind::Str(sym, _) => Self::LitStr(sym),
-                    LitKind::ByteStr(ref bytes, _) => Self::LitBytes(bytes),
+                    LitKind::ByteStr(ref bytes, _) | LitKind::CStr(ref bytes, _) => Self::LitBytes(bytes),
                     LitKind::Byte(val) => Self::LitInt(val.into()),
                     LitKind::Char(val) => Self::LitInt(val.into()),
                     LitKind::Int(val, _) => Self::LitInt(val),
diff --git a/clippy_lints/src/matches/redundant_pattern_match.rs b/clippy_lints/src/matches/redundant_pattern_match.rs
index 7a06443f5d9..e81e09da425 100644
--- a/clippy_lints/src/matches/redundant_pattern_match.rs
+++ b/clippy_lints/src/matches/redundant_pattern_match.rs
@@ -344,10 +344,11 @@ fn is_pat_variant(cx: &LateContext<'_>, pat: &Pat<'_>, path: &QPath<'_>, expecte
     let Some(id) = cx.typeck_results().qpath_res(path, pat.hir_id).opt_def_id() else { return false };
 
     match expected_item {
-        Item::Lang(expected_lang_item) => {
-            let expected_id = cx.tcx.lang_items().require(expected_lang_item).unwrap();
-            cx.tcx.parent(id) == expected_id
-        },
+        Item::Lang(expected_lang_item) => cx
+            .tcx
+            .lang_items()
+            .get(expected_lang_item)
+            .map_or(false, |expected_id| cx.tcx.parent(id) == expected_id),
         Item::Diag(expected_ty, expected_variant) => {
             let ty = cx.typeck_results().pat_ty(pat);
 
diff --git a/clippy_lints/src/methods/unnecessary_to_owned.rs b/clippy_lints/src/methods/unnecessary_to_owned.rs
index 4c4c003ca46..67b7d3691dc 100644
--- a/clippy_lints/src/methods/unnecessary_to_owned.rs
+++ b/clippy_lints/src/methods/unnecessary_to_owned.rs
@@ -385,6 +385,9 @@ fn can_change_type<'a>(cx: &LateContext<'a>, mut expr: &'a Expr<'a>, mut ty: Ty<
             Node::Expr(parent_expr) => {
                 if let Some((callee_def_id, call_substs, recv, call_args)) = get_callee_substs_and_args(cx, parent_expr)
                 {
+                    // FIXME: the `subst_identity()` below seems incorrect, since we eventually
+                    // call `tcx.try_subst_and_normalize_erasing_regions` further down
+                    // (i.e., we are explicitly not in the identity context).
                     let fn_sig = cx.tcx.fn_sig(callee_def_id).subst_identity().skip_binder();
                     if let Some(arg_index) = recv.into_iter().chain(call_args).position(|arg| arg.hir_id == expr.hir_id)
                         && let Some(param_ty) = fn_sig.inputs().get(arg_index)
@@ -435,7 +438,7 @@ fn can_change_type<'a>(cx: &LateContext<'a>, mut expr: &'a Expr<'a>, mut ty: Ty<
                         let output_ty = fn_sig.output();
                         if output_ty.contains(*param_ty) {
                             if let Ok(new_ty)  = cx.tcx.try_subst_and_normalize_erasing_regions(
-                                new_subst, cx.param_env, output_ty) {
+                                new_subst, cx.param_env, EarlyBinder(output_ty)) {
                                 expr = parent_expr;
                                 ty = new_ty;
                                 continue;
diff --git a/clippy_lints/src/renamed_lints.rs b/clippy_lints/src/renamed_lints.rs
index 79d2ca15988..a2c3465cde4 100644
--- a/clippy_lints/src/renamed_lints.rs
+++ b/clippy_lints/src/renamed_lints.rs
@@ -33,9 +33,13 @@ pub static RENAMED_LINTS: &[(&str, &str)] = &[
     ("clippy::zero_width_space", "clippy::invisible_characters"),
     ("clippy::clone_double_ref", "suspicious_double_ref_op"),
     ("clippy::drop_bounds", "drop_bounds"),
+    ("clippy::drop_copy", "drop_copy"),
+    ("clippy::drop_ref", "drop_ref"),
     ("clippy::for_loop_over_option", "for_loops_over_fallibles"),
     ("clippy::for_loop_over_result", "for_loops_over_fallibles"),
     ("clippy::for_loops_over_fallibles", "for_loops_over_fallibles"),
+    ("clippy::forget_copy", "forget_copy"),
+    ("clippy::forget_ref", "forget_ref"),
     ("clippy::into_iter_on_array", "array_into_iter"),
     ("clippy::invalid_atomic_ordering", "invalid_atomic_ordering"),
     ("clippy::invalid_ref", "invalid_value"),
diff --git a/clippy_lints/src/strlen_on_c_strings.rs b/clippy_lints/src/strlen_on_c_strings.rs
index 03324c66e8e..2f2e84fa35a 100644
--- a/clippy_lints/src/strlen_on_c_strings.rs
+++ b/clippy_lints/src/strlen_on_c_strings.rs
@@ -1,11 +1,11 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_context;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
 use clippy_utils::visitors::is_expr_unsafe;
 use clippy_utils::{get_parent_node, match_libc_symbol};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::{Block, BlockCheckMode, Expr, ExprKind, Node, UnsafeSource};
+use rustc_hir::{Block, BlockCheckMode, Expr, ExprKind, LangItem, Node, UnsafeSource};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::sym;
@@ -67,7 +67,7 @@ impl<'tcx> LateLintPass<'tcx> for StrlenOnCStrings {
                 let val_name = snippet_with_context(cx, self_arg.span, ctxt, "..", &mut app).0;
                 let method_name = if is_type_diagnostic_item(cx, ty, sym::cstring_type) {
                     "as_bytes"
-                } else if is_type_diagnostic_item(cx, ty, sym::CStr) {
+                } else if is_type_lang_item(cx, ty, LangItem::CStr) {
                     "to_bytes"
                 } else {
                     return;
diff --git a/clippy_lints/src/utils/author.rs b/clippy_lints/src/utils/author.rs
index 108077b9d15..3c2bf5abab2 100644
--- a/clippy_lints/src/utils/author.rs
+++ b/clippy_lints/src/utils/author.rs
@@ -304,6 +304,11 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
                 kind!("ByteStr(ref {vec})");
                 chain!(self, "let [{:?}] = **{vec}", vec.value);
             },
+            LitKind::CStr(ref vec, _) => {
+                bind!(self, vec);
+                kind!("CStr(ref {vec})");
+                chain!(self, "let [{:?}] = **{vec}", vec.value);
+            },
             LitKind::Str(s, _) => {
                 bind!(self, s);
                 kind!("Str({s}, _)");
diff --git a/clippy_utils/src/consts.rs b/clippy_utils/src/consts.rs
index 992d41bc378..fb772644c0d 100644
--- a/clippy_utils/src/consts.rs
+++ b/clippy_utils/src/consts.rs
@@ -213,7 +213,7 @@ pub fn lit_to_mir_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
     match *lit {
         LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
         LitKind::Byte(b) => Constant::Int(u128::from(b)),
-        LitKind::ByteStr(ref s, _) => Constant::Binary(Lrc::clone(s)),
+        LitKind::ByteStr(ref s, _) | LitKind::CStr(ref s, _) => Constant::Binary(Lrc::clone(s)),
         LitKind::Char(c) => Constant::Char(c),
         LitKind::Int(n, _) => Constant::Int(n),
         LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {
diff --git a/rust-toolchain b/rust-toolchain
index 60b8a5ac071..bc7fb711ed8 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2023-05-05"
+channel = "nightly-2023-05-20"
 components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
diff --git a/src/driver.rs b/src/driver.rs
index 205905d5091..59bf447a7cd 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -11,7 +11,6 @@
 // FIXME: switch to something more ergonomic here, once available.
 // (Currently there is no way to opt into sysroot crates without `extern crate`.)
 extern crate rustc_driver;
-extern crate rustc_errors;
 extern crate rustc_interface;
 extern crate rustc_session;
 extern crate rustc_span;
@@ -20,13 +19,10 @@ use rustc_interface::interface;
 use rustc_session::parse::ParseSess;
 use rustc_span::symbol::Symbol;
 
-use std::borrow::Cow;
 use std::env;
 use std::ops::Deref;
-use std::panic;
 use std::path::Path;
 use std::process::exit;
-use std::sync::LazyLock;
 
 /// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
 /// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
@@ -198,66 +194,18 @@ You can use tool lints to allow or deny lints from your code, eg.:
 
 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new";
 
-type PanicCallback = dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static;
-static ICE_HOOK: LazyLock<Box<PanicCallback>> = LazyLock::new(|| {
-    let hook = panic::take_hook();
-    panic::set_hook(Box::new(|info| report_clippy_ice(info, BUG_REPORT_URL)));
-    hook
-});
-
-fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
-    // Invoke our ICE handler, which prints the actual panic message and optionally a backtrace
-    (*ICE_HOOK)(info);
-
-    // Separate the output with an empty line
-    eprintln!();
-
-    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(), false);
-    let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
-        rustc_errors::ColorConfig::Auto,
-        None,
-        None,
-        fallback_bundle,
-        false,
-        false,
-        None,
-        false,
-        false,
-        rustc_errors::TerminalUrl::No,
-    ));
-    let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
-
-    // a .span_bug or .bug call has already printed what
-    // it wants to print.
-    if !info.payload().is::<rustc_errors::ExplicitBug>() {
-        let mut d = rustc_errors::Diagnostic::new(rustc_errors::Level::Bug, "unexpected panic");
-        handler.emit_diagnostic(&mut d);
-    }
-
-    let version_info = rustc_tools_util::get_version_info!();
-
-    let xs: Vec<Cow<'static, str>> = vec![
-        "the compiler unexpectedly panicked. this is a bug.".into(),
-        format!("we would appreciate a bug report: {bug_report_url}").into(),
-        format!("Clippy version: {version_info}").into(),
-    ];
-
-    for note in &xs {
-        handler.note_without_error(note.as_ref());
-    }
-
-    // If backtraces are enabled, also print the query stack
-    let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, |x| &x != "0");
-
-    let num_frames = if backtrace { None } else { Some(2) };
-
-    interface::try_print_query_stack(&handler, num_frames);
-}
-
 #[allow(clippy::too_many_lines)]
 pub fn main() {
     rustc_driver::init_rustc_env_logger();
-    LazyLock::force(&ICE_HOOK);
+
+    rustc_driver::install_ice_hook(BUG_REPORT_URL, |handler| {
+        // FIXME: this macro calls unwrap internally but is called in a panicking context!  It's not
+        // as simple as moving the call from the hook to main, because `install_ice_hook` doesn't
+        // accept a generic closure.
+        let version_info = rustc_tools_util::get_version_info!();
+        handler.note_without_error(format!("Clippy version: {version_info}"));
+    });
+
     exit(rustc_driver::catch_with_exit_code(move || {
         let mut orig_args: Vec<String> = env::args().collect();
         let has_sysroot_arg = arg_value(&orig_args, "--sysroot", |_| true).is_some();
diff --git a/tests/ui-internal/custom_ice_message.rs b/tests/ui-internal/custom_ice_message.rs
index acb98d7ba98..99ce7028390 100644
--- a/tests/ui-internal/custom_ice_message.rs
+++ b/tests/ui-internal/custom_ice_message.rs
@@ -3,6 +3,7 @@
 //@normalize-stderr-test: "produce_ice.rs:\d*:\d*" -> "produce_ice.rs"
 //@normalize-stderr-test: "', .*clippy_lints" -> "', clippy_lints"
 //@normalize-stderr-test: "'rustc'" -> "'<unnamed>'"
+//@normalize-stderr-test: "running on .*" -> "running on <target>"
 //@normalize-stderr-test: "(?ms)query stack during panic:\n.*end of query stack\n" -> ""
 
 #![deny(clippy::internal)]
diff --git a/tests/ui-internal/custom_ice_message.stderr b/tests/ui-internal/custom_ice_message.stderr
index b4619e980f3..0fc385cd693 100644
--- a/tests/ui-internal/custom_ice_message.stderr
+++ b/tests/ui-internal/custom_ice_message.stderr
@@ -1,12 +1,14 @@
 thread '<unnamed>' panicked at 'Would you like some help with that?', clippy_lints/src/utils/internal_lints/produce_ice.rs
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 
-error: internal compiler error: unexpected panic
-
-note: the compiler unexpectedly panicked. this is a bug.
+error: the compiler unexpectedly panicked. this is a bug.
 
 note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new
 
+note: rustc 1.71.0-nightly (521f4dae1 2023-05-19) running on <target>
+
+note: compiler flags: -C prefer-dynamic -Z ui-testing
+
 note: Clippy version: foo
 
 thread panicked while panicking. aborting.
diff --git a/tests/ui/box_default.fixed b/tests/ui/box_default.fixed
index fb066d8982e..840902b5323 100644
--- a/tests/ui/box_default.fixed
+++ b/tests/ui/box_default.fixed
@@ -1,6 +1,6 @@
 //@run-rustfix
 #![warn(clippy::box_default)]
-#![allow(unused, clippy::default_constructed_unit_structs)]
+#![allow(clippy::default_constructed_unit_structs)]
 
 #[derive(Default)]
 struct ImplementsDefault;
diff --git a/tests/ui/box_default.rs b/tests/ui/box_default.rs
index 2882170492c..3618486a473 100644
--- a/tests/ui/box_default.rs
+++ b/tests/ui/box_default.rs
@@ -1,6 +1,6 @@
 //@run-rustfix
 #![warn(clippy::box_default)]
-#![allow(unused, clippy::default_constructed_unit_structs)]
+#![allow(clippy::default_constructed_unit_structs)]
 
 #[derive(Default)]
 struct ImplementsDefault;
diff --git a/tests/ui/diverging_sub_expression.stderr b/tests/ui/diverging_sub_expression.stderr
index 9c91d935716..51a3b0d972e 100644
--- a/tests/ui/diverging_sub_expression.stderr
+++ b/tests/ui/diverging_sub_expression.stderr
@@ -30,19 +30,11 @@ error: sub-expression diverges
 LL |             3 => true || diverge(),
    |                          ^^^^^^^^^
 
-error: sub-expression diverges
-  --> $DIR/diverging_sub_expression.rs:36:30
-   |
-LL |                 _ => true || panic!("boo"),
-   |                              ^^^^^^^^^^^^^
-   |
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
-
 error: sub-expression diverges
   --> $DIR/diverging_sub_expression.rs:38:26
    |
 LL |             _ => true || break,
    |                          ^^^^^
 
-error: aborting due to 7 previous errors
+error: aborting due to 6 previous errors
 
diff --git a/tests/ui/drop_forget_copy.rs b/tests/ui/drop_forget_copy.rs
deleted file mode 100644
index a7276dd59f4..00000000000
--- a/tests/ui/drop_forget_copy.rs
+++ /dev/null
@@ -1,86 +0,0 @@
-#![warn(clippy::drop_copy, clippy::forget_copy)]
-#![allow(clippy::toplevel_ref_arg, clippy::drop_ref, clippy::forget_ref, unused_mut)]
-
-use std::mem::{drop, forget};
-use std::vec::Vec;
-
-#[derive(Copy, Clone)]
-struct SomeStruct;
-
-struct AnotherStruct {
-    x: u8,
-    y: u8,
-    z: Vec<u8>,
-}
-
-impl Clone for AnotherStruct {
-    fn clone(&self) -> AnotherStruct {
-        AnotherStruct {
-            x: self.x,
-            y: self.y,
-            z: self.z.clone(),
-        }
-    }
-}
-
-fn main() {
-    let s1 = SomeStruct {};
-    let s2 = s1;
-    let s3 = &s1;
-    let mut s4 = s1;
-    let ref s5 = s1;
-
-    drop(s1);
-    drop(s2);
-    drop(s3);
-    drop(s4);
-    drop(s5);
-
-    forget(s1);
-    forget(s2);
-    forget(s3);
-    forget(s4);
-    forget(s5);
-
-    let a1 = AnotherStruct {
-        x: 255,
-        y: 0,
-        z: vec![1, 2, 3],
-    };
-    let a2 = &a1;
-    let mut a3 = a1.clone();
-    let ref a4 = a1;
-    let a5 = a1.clone();
-
-    drop(a2);
-    drop(a3);
-    drop(a4);
-    drop(a5);
-
-    forget(a2);
-    let a3 = &a1;
-    forget(a3);
-    forget(a4);
-    let a5 = a1.clone();
-    forget(a5);
-}
-
-#[allow(unused)]
-#[allow(clippy::unit_cmp)]
-fn issue9482(x: u8) {
-    fn println_and<T>(t: T) -> T {
-        println!("foo");
-        t
-    }
-
-    match x {
-        0 => drop(println_and(12)), // Don't lint (copy type), we only care about side-effects
-        1 => drop(println_and(String::new())), // Don't lint (no copy type), we only care about side-effects
-        2 => {
-            drop(println_and(13)); // Lint, even if we only care about the side-effect, it's already in a block
-        },
-        3 if drop(println_and(14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
-        4 => drop(2),                           // Lint, not a fn/method call
-        _ => (),
-    }
-}
diff --git a/tests/ui/drop_forget_copy.stderr b/tests/ui/drop_forget_copy.stderr
deleted file mode 100644
index 90bef1c3c43..00000000000
--- a/tests/ui/drop_forget_copy.stderr
+++ /dev/null
@@ -1,112 +0,0 @@
-error: calls to `std::mem::drop` with a value that implements `Copy`. Dropping a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:33:5
-   |
-LL |     drop(s1);
-   |     ^^^^^^^^
-   |
-note: argument has type `SomeStruct`
-  --> $DIR/drop_forget_copy.rs:33:10
-   |
-LL |     drop(s1);
-   |          ^^
-   = note: `-D clippy::drop-copy` implied by `-D warnings`
-
-error: calls to `std::mem::drop` with a value that implements `Copy`. Dropping a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:34:5
-   |
-LL |     drop(s2);
-   |     ^^^^^^^^
-   |
-note: argument has type `SomeStruct`
-  --> $DIR/drop_forget_copy.rs:34:10
-   |
-LL |     drop(s2);
-   |          ^^
-
-error: calls to `std::mem::drop` with a value that implements `Copy`. Dropping a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:36:5
-   |
-LL |     drop(s4);
-   |     ^^^^^^^^
-   |
-note: argument has type `SomeStruct`
-  --> $DIR/drop_forget_copy.rs:36:10
-   |
-LL |     drop(s4);
-   |          ^^
-
-error: calls to `std::mem::forget` with a value that implements `Copy`. Forgetting a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:39:5
-   |
-LL |     forget(s1);
-   |     ^^^^^^^^^^
-   |
-note: argument has type `SomeStruct`
-  --> $DIR/drop_forget_copy.rs:39:12
-   |
-LL |     forget(s1);
-   |            ^^
-   = note: `-D clippy::forget-copy` implied by `-D warnings`
-
-error: calls to `std::mem::forget` with a value that implements `Copy`. Forgetting a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:40:5
-   |
-LL |     forget(s2);
-   |     ^^^^^^^^^^
-   |
-note: argument has type `SomeStruct`
-  --> $DIR/drop_forget_copy.rs:40:12
-   |
-LL |     forget(s2);
-   |            ^^
-
-error: calls to `std::mem::forget` with a value that implements `Copy`. Forgetting a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:42:5
-   |
-LL |     forget(s4);
-   |     ^^^^^^^^^^
-   |
-note: argument has type `SomeStruct`
-  --> $DIR/drop_forget_copy.rs:42:12
-   |
-LL |     forget(s4);
-   |            ^^
-
-error: calls to `std::mem::drop` with a value that implements `Copy`. Dropping a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:80:13
-   |
-LL |             drop(println_and(13)); // Lint, even if we only care about the side-effect, it's already in a block
-   |             ^^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `i32`
-  --> $DIR/drop_forget_copy.rs:80:18
-   |
-LL |             drop(println_and(13)); // Lint, even if we only care about the side-effect, it's already in a block
-   |                  ^^^^^^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a value that implements `Copy`. Dropping a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:82:14
-   |
-LL |         3 if drop(println_and(14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
-   |              ^^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `i32`
-  --> $DIR/drop_forget_copy.rs:82:19
-   |
-LL |         3 if drop(println_and(14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
-   |                   ^^^^^^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a value that implements `Copy`. Dropping a copy leaves the original intact
-  --> $DIR/drop_forget_copy.rs:83:14
-   |
-LL |         4 => drop(2),                           // Lint, not a fn/method call
-   |              ^^^^^^^
-   |
-note: argument has type `i32`
-  --> $DIR/drop_forget_copy.rs:83:19
-   |
-LL |         4 => drop(2),                           // Lint, not a fn/method call
-   |                   ^
-
-error: aborting due to 9 previous errors
-
diff --git a/tests/ui/drop_ref.rs b/tests/ui/drop_ref.rs
deleted file mode 100644
index 10044e65f11..00000000000
--- a/tests/ui/drop_ref.rs
+++ /dev/null
@@ -1,97 +0,0 @@
-#![warn(clippy::drop_ref)]
-#![allow(clippy::toplevel_ref_arg)]
-#![allow(clippy::map_err_ignore)]
-#![allow(clippy::unnecessary_wraps, clippy::drop_non_drop)]
-
-use std::mem::drop;
-
-struct SomeStruct;
-
-fn main() {
-    drop(&SomeStruct);
-
-    let mut owned1 = SomeStruct;
-    drop(&owned1);
-    drop(&&owned1);
-    drop(&mut owned1);
-    drop(owned1); //OK
-
-    let reference1 = &SomeStruct;
-    drop(reference1);
-
-    let reference2 = &mut SomeStruct;
-    drop(reference2);
-
-    let ref reference3 = SomeStruct;
-    drop(reference3);
-}
-
-#[allow(dead_code)]
-fn test_generic_fn_drop<T>(val: T) {
-    drop(&val);
-    drop(val); //OK
-}
-
-#[allow(dead_code)]
-fn test_similarly_named_function() {
-    fn drop<T>(_val: T) {}
-    drop(&SomeStruct); //OK; call to unrelated function which happens to have the same name
-    std::mem::drop(&SomeStruct);
-}
-
-#[derive(Copy, Clone)]
-pub struct Error;
-fn produce_half_owl_error() -> Result<(), Error> {
-    Ok(())
-}
-
-fn produce_half_owl_ok() -> Result<bool, ()> {
-    Ok(true)
-}
-
-#[allow(dead_code)]
-fn test_owl_result() -> Result<(), ()> {
-    produce_half_owl_error().map_err(|_| ())?;
-    produce_half_owl_ok().map(|_| ())?;
-    // the following should not be linted,
-    // we should not force users to use toilet closures
-    // to produce owl results when drop is more convenient
-    produce_half_owl_error().map_err(drop)?;
-    produce_half_owl_ok().map_err(drop)?;
-    Ok(())
-}
-
-#[allow(dead_code)]
-fn test_owl_result_2() -> Result<u8, ()> {
-    produce_half_owl_error().map_err(|_| ())?;
-    produce_half_owl_ok().map(|_| ())?;
-    // the following should not be linted,
-    // we should not force users to use toilet closures
-    // to produce owl results when drop is more convenient
-    produce_half_owl_error().map_err(drop)?;
-    produce_half_owl_ok().map(drop)?;
-    Ok(1)
-}
-
-#[allow(unused)]
-#[allow(clippy::unit_cmp)]
-fn issue10122(x: u8) {
-    // This is a function which returns a reference and has a side-effect, which means
-    // that calling drop() on the function is considered an idiomatic way of achieving the side-effect
-    // in a match arm.
-    fn println_and<T>(t: &T) -> &T {
-        println!("foo");
-        t
-    }
-
-    match x {
-        0 => drop(println_and(&12)), // Don't lint (copy type), we only care about side-effects
-        1 => drop(println_and(&String::new())), // Don't lint (no copy type), we only care about side-effects
-        2 => {
-            drop(println_and(&13)); // Lint, even if we only care about the side-effect, it's already in a block
-        },
-        3 if drop(println_and(&14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
-        4 => drop(&2),                           // Lint, not a fn/method call
-        _ => (),
-    }
-}
diff --git a/tests/ui/drop_ref.stderr b/tests/ui/drop_ref.stderr
deleted file mode 100644
index 293b9f6de83..00000000000
--- a/tests/ui/drop_ref.stderr
+++ /dev/null
@@ -1,147 +0,0 @@
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:11:5
-   |
-LL |     drop(&SomeStruct);
-   |     ^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/drop_ref.rs:11:10
-   |
-LL |     drop(&SomeStruct);
-   |          ^^^^^^^^^^^
-   = note: `-D clippy::drop-ref` implied by `-D warnings`
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:14:5
-   |
-LL |     drop(&owned1);
-   |     ^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/drop_ref.rs:14:10
-   |
-LL |     drop(&owned1);
-   |          ^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:15:5
-   |
-LL |     drop(&&owned1);
-   |     ^^^^^^^^^^^^^^
-   |
-note: argument has type `&&SomeStruct`
-  --> $DIR/drop_ref.rs:15:10
-   |
-LL |     drop(&&owned1);
-   |          ^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:16:5
-   |
-LL |     drop(&mut owned1);
-   |     ^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&mut SomeStruct`
-  --> $DIR/drop_ref.rs:16:10
-   |
-LL |     drop(&mut owned1);
-   |          ^^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:20:5
-   |
-LL |     drop(reference1);
-   |     ^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/drop_ref.rs:20:10
-   |
-LL |     drop(reference1);
-   |          ^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:23:5
-   |
-LL |     drop(reference2);
-   |     ^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&mut SomeStruct`
-  --> $DIR/drop_ref.rs:23:10
-   |
-LL |     drop(reference2);
-   |          ^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:26:5
-   |
-LL |     drop(reference3);
-   |     ^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/drop_ref.rs:26:10
-   |
-LL |     drop(reference3);
-   |          ^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:31:5
-   |
-LL |     drop(&val);
-   |     ^^^^^^^^^^
-   |
-note: argument has type `&T`
-  --> $DIR/drop_ref.rs:31:10
-   |
-LL |     drop(&val);
-   |          ^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:39:5
-   |
-LL |     std::mem::drop(&SomeStruct);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/drop_ref.rs:39:20
-   |
-LL |     std::mem::drop(&SomeStruct);
-   |                    ^^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:91:13
-   |
-LL |             drop(println_and(&13)); // Lint, even if we only care about the side-effect, it's already in a block
-   |             ^^^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&i32`
-  --> $DIR/drop_ref.rs:91:18
-   |
-LL |             drop(println_and(&13)); // Lint, even if we only care about the side-effect, it's already in a block
-   |                  ^^^^^^^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:93:14
-   |
-LL |         3 if drop(println_and(&14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
-   |              ^^^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&i32`
-  --> $DIR/drop_ref.rs:93:19
-   |
-LL |         3 if drop(println_and(&14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
-   |                   ^^^^^^^^^^^^^^^^
-
-error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
-  --> $DIR/drop_ref.rs:94:14
-   |
-LL |         4 => drop(&2),                           // Lint, not a fn/method call
-   |              ^^^^^^^^
-   |
-note: argument has type `&i32`
-  --> $DIR/drop_ref.rs:94:19
-   |
-LL |         4 => drop(&2),                           // Lint, not a fn/method call
-   |                   ^^
-
-error: aborting due to 12 previous errors
-
diff --git a/tests/ui/forget_ref.rs b/tests/ui/forget_ref.rs
deleted file mode 100644
index 031b415f56f..00000000000
--- a/tests/ui/forget_ref.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-#![warn(clippy::forget_ref)]
-#![allow(clippy::toplevel_ref_arg)]
-#![allow(clippy::unnecessary_wraps, clippy::forget_non_drop)]
-#![allow(clippy::borrow_deref_ref)]
-
-use std::mem::forget;
-
-struct SomeStruct;
-
-fn main() {
-    forget(&SomeStruct);
-
-    let mut owned = SomeStruct;
-    forget(&owned);
-    forget(&&owned);
-    forget(&mut owned);
-    forget(owned); //OK
-
-    let reference1 = &SomeStruct;
-    forget(&*reference1);
-
-    let reference2 = &mut SomeStruct;
-    forget(reference2);
-
-    let ref reference3 = SomeStruct;
-    forget(reference3);
-}
-
-#[allow(dead_code)]
-fn test_generic_fn_forget<T>(val: T) {
-    forget(&val);
-    forget(val); //OK
-}
-
-#[allow(dead_code)]
-fn test_similarly_named_function() {
-    fn forget<T>(_val: T) {}
-    forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
-    std::mem::forget(&SomeStruct);
-}
-
-#[derive(Copy, Clone)]
-pub struct Error;
-fn produce_half_owl_error() -> Result<(), Error> {
-    Ok(())
-}
-
-fn produce_half_owl_ok() -> Result<bool, ()> {
-    Ok(true)
-}
diff --git a/tests/ui/forget_ref.stderr b/tests/ui/forget_ref.stderr
deleted file mode 100644
index 011cdefc665..00000000000
--- a/tests/ui/forget_ref.stderr
+++ /dev/null
@@ -1,111 +0,0 @@
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:11:5
-   |
-LL |     forget(&SomeStruct);
-   |     ^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/forget_ref.rs:11:12
-   |
-LL |     forget(&SomeStruct);
-   |            ^^^^^^^^^^^
-   = note: `-D clippy::forget-ref` implied by `-D warnings`
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:14:5
-   |
-LL |     forget(&owned);
-   |     ^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/forget_ref.rs:14:12
-   |
-LL |     forget(&owned);
-   |            ^^^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:15:5
-   |
-LL |     forget(&&owned);
-   |     ^^^^^^^^^^^^^^^
-   |
-note: argument has type `&&SomeStruct`
-  --> $DIR/forget_ref.rs:15:12
-   |
-LL |     forget(&&owned);
-   |            ^^^^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:16:5
-   |
-LL |     forget(&mut owned);
-   |     ^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&mut SomeStruct`
-  --> $DIR/forget_ref.rs:16:12
-   |
-LL |     forget(&mut owned);
-   |            ^^^^^^^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:20:5
-   |
-LL |     forget(&*reference1);
-   |     ^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/forget_ref.rs:20:12
-   |
-LL |     forget(&*reference1);
-   |            ^^^^^^^^^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:23:5
-   |
-LL |     forget(reference2);
-   |     ^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&mut SomeStruct`
-  --> $DIR/forget_ref.rs:23:12
-   |
-LL |     forget(reference2);
-   |            ^^^^^^^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:26:5
-   |
-LL |     forget(reference3);
-   |     ^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/forget_ref.rs:26:12
-   |
-LL |     forget(reference3);
-   |            ^^^^^^^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:31:5
-   |
-LL |     forget(&val);
-   |     ^^^^^^^^^^^^
-   |
-note: argument has type `&T`
-  --> $DIR/forget_ref.rs:31:12
-   |
-LL |     forget(&val);
-   |            ^^^^
-
-error: calls to `std::mem::forget` with a reference instead of an owned value. Forgetting a reference does nothing
-  --> $DIR/forget_ref.rs:39:5
-   |
-LL |     std::mem::forget(&SomeStruct);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-note: argument has type `&SomeStruct`
-  --> $DIR/forget_ref.rs:39:22
-   |
-LL |     std::mem::forget(&SomeStruct);
-   |                      ^^^^^^^^^^^
-
-error: aborting due to 9 previous errors
-
diff --git a/tests/ui/issue-111399.rs b/tests/ui/issue-111399.rs
new file mode 100644
index 00000000000..b65e6c7261a
--- /dev/null
+++ b/tests/ui/issue-111399.rs
@@ -0,0 +1,13 @@
+#![feature(inherent_associated_types)]
+#![allow(incomplete_features)]
+
+// Check that rustc doesn't crash on the trait bound `Self::Ty: std::marker::Freeze`.
+
+pub struct Struct;
+
+impl Struct {
+    pub type Ty = usize;
+    pub const CT: Self::Ty = 42;
+}
+
+fn main() {}
diff --git a/tests/ui/mem_forget.rs b/tests/ui/mem_forget.rs
index e5b35c098a2..5137448a6d4 100644
--- a/tests/ui/mem_forget.rs
+++ b/tests/ui/mem_forget.rs
@@ -5,7 +5,7 @@ use std::mem as memstuff;
 use std::mem::forget as forgetSomething;
 
 #[warn(clippy::mem_forget)]
-#[allow(clippy::forget_copy)]
+#[allow(forget_copy)]
 fn main() {
     let five: i32 = 5;
     forgetSomething(five);
diff --git a/tests/ui/multiple_unsafe_ops_per_block.rs b/tests/ui/multiple_unsafe_ops_per_block.rs
index 73ef35c8c36..f28153e56b0 100644
--- a/tests/ui/multiple_unsafe_ops_per_block.rs
+++ b/tests/ui/multiple_unsafe_ops_per_block.rs
@@ -2,7 +2,7 @@
 #![allow(unused)]
 #![allow(deref_nullptr)]
 #![allow(clippy::unnecessary_operation)]
-#![allow(clippy::drop_copy)]
+#![allow(drop_copy)]
 #![warn(clippy::multiple_unsafe_ops_per_block)]
 
 extern crate proc_macros;
diff --git a/tests/ui/rename.fixed b/tests/ui/rename.fixed
index 104c8191712..bba8a6a4d4a 100644
--- a/tests/ui/rename.fixed
+++ b/tests/ui/rename.fixed
@@ -30,7 +30,11 @@
 #![allow(clippy::invisible_characters)]
 #![allow(suspicious_double_ref_op)]
 #![allow(drop_bounds)]
+#![allow(drop_copy)]
+#![allow(drop_ref)]
 #![allow(for_loops_over_fallibles)]
+#![allow(forget_copy)]
+#![allow(forget_ref)]
 #![allow(array_into_iter)]
 #![allow(invalid_atomic_ordering)]
 #![allow(invalid_value)]
@@ -72,9 +76,13 @@
 #![warn(clippy::invisible_characters)]
 #![warn(suspicious_double_ref_op)]
 #![warn(drop_bounds)]
+#![warn(drop_copy)]
+#![warn(drop_ref)]
 #![warn(for_loops_over_fallibles)]
 #![warn(for_loops_over_fallibles)]
 #![warn(for_loops_over_fallibles)]
+#![warn(forget_copy)]
+#![warn(forget_ref)]
 #![warn(array_into_iter)]
 #![warn(invalid_atomic_ordering)]
 #![warn(invalid_value)]
diff --git a/tests/ui/rename.rs b/tests/ui/rename.rs
index c7fc7a47a4a..7bd100c4fc2 100644
--- a/tests/ui/rename.rs
+++ b/tests/ui/rename.rs
@@ -30,7 +30,11 @@
 #![allow(clippy::invisible_characters)]
 #![allow(suspicious_double_ref_op)]
 #![allow(drop_bounds)]
+#![allow(drop_copy)]
+#![allow(drop_ref)]
 #![allow(for_loops_over_fallibles)]
+#![allow(forget_copy)]
+#![allow(forget_ref)]
 #![allow(array_into_iter)]
 #![allow(invalid_atomic_ordering)]
 #![allow(invalid_value)]
@@ -72,9 +76,13 @@
 #![warn(clippy::zero_width_space)]
 #![warn(clippy::clone_double_ref)]
 #![warn(clippy::drop_bounds)]
+#![warn(clippy::drop_copy)]
+#![warn(clippy::drop_ref)]
 #![warn(clippy::for_loop_over_option)]
 #![warn(clippy::for_loop_over_result)]
 #![warn(clippy::for_loops_over_fallibles)]
+#![warn(clippy::forget_copy)]
+#![warn(clippy::forget_ref)]
 #![warn(clippy::into_iter_on_array)]
 #![warn(clippy::invalid_atomic_ordering)]
 #![warn(clippy::invalid_ref)]
diff --git a/tests/ui/rename.stderr b/tests/ui/rename.stderr
index d44bd9c4d2a..cdd3bf93d34 100644
--- a/tests/ui/rename.stderr
+++ b/tests/ui/rename.stderr
@@ -1,5 +1,5 @@
 error: lint `clippy::almost_complete_letter_range` has been renamed to `clippy::almost_complete_range`
-  --> $DIR/rename.rs:44:9
+  --> $DIR/rename.rs:48:9
    |
 LL | #![warn(clippy::almost_complete_letter_range)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::almost_complete_range`
@@ -7,262 +7,286 @@ LL | #![warn(clippy::almost_complete_letter_range)]
    = note: `-D renamed-and-removed-lints` implied by `-D warnings`
 
 error: lint `clippy::blacklisted_name` has been renamed to `clippy::disallowed_names`
-  --> $DIR/rename.rs:45:9
+  --> $DIR/rename.rs:49:9
    |
 LL | #![warn(clippy::blacklisted_name)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_names`
 
 error: lint `clippy::block_in_if_condition_expr` has been renamed to `clippy::blocks_in_if_conditions`
-  --> $DIR/rename.rs:46:9
+  --> $DIR/rename.rs:50:9
    |
 LL | #![warn(clippy::block_in_if_condition_expr)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
 
 error: lint `clippy::block_in_if_condition_stmt` has been renamed to `clippy::blocks_in_if_conditions`
-  --> $DIR/rename.rs:47:9
+  --> $DIR/rename.rs:51:9
    |
 LL | #![warn(clippy::block_in_if_condition_stmt)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
 
 error: lint `clippy::box_vec` has been renamed to `clippy::box_collection`
-  --> $DIR/rename.rs:48:9
+  --> $DIR/rename.rs:52:9
    |
 LL | #![warn(clippy::box_vec)]
    |         ^^^^^^^^^^^^^^^ help: use the new name: `clippy::box_collection`
 
 error: lint `clippy::const_static_lifetime` has been renamed to `clippy::redundant_static_lifetimes`
-  --> $DIR/rename.rs:49:9
+  --> $DIR/rename.rs:53:9
    |
 LL | #![warn(clippy::const_static_lifetime)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::redundant_static_lifetimes`
 
 error: lint `clippy::cyclomatic_complexity` has been renamed to `clippy::cognitive_complexity`
-  --> $DIR/rename.rs:50:9
+  --> $DIR/rename.rs:54:9
    |
 LL | #![warn(clippy::cyclomatic_complexity)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::cognitive_complexity`
 
 error: lint `clippy::derive_hash_xor_eq` has been renamed to `clippy::derived_hash_with_manual_eq`
-  --> $DIR/rename.rs:51:9
+  --> $DIR/rename.rs:55:9
    |
 LL | #![warn(clippy::derive_hash_xor_eq)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::derived_hash_with_manual_eq`
 
 error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_methods`
-  --> $DIR/rename.rs:52:9
+  --> $DIR/rename.rs:56:9
    |
 LL | #![warn(clippy::disallowed_method)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_methods`
 
 error: lint `clippy::disallowed_type` has been renamed to `clippy::disallowed_types`
-  --> $DIR/rename.rs:53:9
+  --> $DIR/rename.rs:57:9
    |
 LL | #![warn(clippy::disallowed_type)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_types`
 
 error: lint `clippy::eval_order_dependence` has been renamed to `clippy::mixed_read_write_in_expression`
-  --> $DIR/rename.rs:54:9
+  --> $DIR/rename.rs:58:9
    |
 LL | #![warn(clippy::eval_order_dependence)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::mixed_read_write_in_expression`
 
 error: lint `clippy::identity_conversion` has been renamed to `clippy::useless_conversion`
-  --> $DIR/rename.rs:55:9
+  --> $DIR/rename.rs:59:9
    |
 LL | #![warn(clippy::identity_conversion)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::useless_conversion`
 
 error: lint `clippy::if_let_some_result` has been renamed to `clippy::match_result_ok`
-  --> $DIR/rename.rs:56:9
+  --> $DIR/rename.rs:60:9
    |
 LL | #![warn(clippy::if_let_some_result)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::match_result_ok`
 
 error: lint `clippy::integer_arithmetic` has been renamed to `clippy::arithmetic_side_effects`
-  --> $DIR/rename.rs:57:9
+  --> $DIR/rename.rs:61:9
    |
 LL | #![warn(clippy::integer_arithmetic)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::arithmetic_side_effects`
 
 error: lint `clippy::logic_bug` has been renamed to `clippy::overly_complex_bool_expr`
-  --> $DIR/rename.rs:58:9
+  --> $DIR/rename.rs:62:9
    |
 LL | #![warn(clippy::logic_bug)]
    |         ^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::overly_complex_bool_expr`
 
 error: lint `clippy::new_without_default_derive` has been renamed to `clippy::new_without_default`
-  --> $DIR/rename.rs:59:9
+  --> $DIR/rename.rs:63:9
    |
 LL | #![warn(clippy::new_without_default_derive)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::new_without_default`
 
 error: lint `clippy::option_and_then_some` has been renamed to `clippy::bind_instead_of_map`
-  --> $DIR/rename.rs:60:9
+  --> $DIR/rename.rs:64:9
    |
 LL | #![warn(clippy::option_and_then_some)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::bind_instead_of_map`
 
 error: lint `clippy::option_expect_used` has been renamed to `clippy::expect_used`
-  --> $DIR/rename.rs:61:9
+  --> $DIR/rename.rs:65:9
    |
 LL | #![warn(clippy::option_expect_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
 
 error: lint `clippy::option_map_unwrap_or` has been renamed to `clippy::map_unwrap_or`
-  --> $DIR/rename.rs:62:9
+  --> $DIR/rename.rs:66:9
    |
 LL | #![warn(clippy::option_map_unwrap_or)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
 
 error: lint `clippy::option_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
-  --> $DIR/rename.rs:63:9
+  --> $DIR/rename.rs:67:9
    |
 LL | #![warn(clippy::option_map_unwrap_or_else)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
 
 error: lint `clippy::option_unwrap_used` has been renamed to `clippy::unwrap_used`
-  --> $DIR/rename.rs:64:9
+  --> $DIR/rename.rs:68:9
    |
 LL | #![warn(clippy::option_unwrap_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
 
 error: lint `clippy::ref_in_deref` has been renamed to `clippy::needless_borrow`
-  --> $DIR/rename.rs:65:9
+  --> $DIR/rename.rs:69:9
    |
 LL | #![warn(clippy::ref_in_deref)]
    |         ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::needless_borrow`
 
 error: lint `clippy::result_expect_used` has been renamed to `clippy::expect_used`
-  --> $DIR/rename.rs:66:9
+  --> $DIR/rename.rs:70:9
    |
 LL | #![warn(clippy::result_expect_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
 
 error: lint `clippy::result_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
-  --> $DIR/rename.rs:67:9
+  --> $DIR/rename.rs:71:9
    |
 LL | #![warn(clippy::result_map_unwrap_or_else)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
 
 error: lint `clippy::result_unwrap_used` has been renamed to `clippy::unwrap_used`
-  --> $DIR/rename.rs:68:9
+  --> $DIR/rename.rs:72:9
    |
 LL | #![warn(clippy::result_unwrap_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
 
 error: lint `clippy::single_char_push_str` has been renamed to `clippy::single_char_add_str`
-  --> $DIR/rename.rs:69:9
+  --> $DIR/rename.rs:73:9
    |
 LL | #![warn(clippy::single_char_push_str)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::single_char_add_str`
 
 error: lint `clippy::stutter` has been renamed to `clippy::module_name_repetitions`
-  --> $DIR/rename.rs:70:9
+  --> $DIR/rename.rs:74:9
    |
 LL | #![warn(clippy::stutter)]
    |         ^^^^^^^^^^^^^^^ help: use the new name: `clippy::module_name_repetitions`
 
 error: lint `clippy::to_string_in_display` has been renamed to `clippy::recursive_format_impl`
-  --> $DIR/rename.rs:71:9
+  --> $DIR/rename.rs:75:9
    |
 LL | #![warn(clippy::to_string_in_display)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::recursive_format_impl`
 
 error: lint `clippy::zero_width_space` has been renamed to `clippy::invisible_characters`
-  --> $DIR/rename.rs:72:9
+  --> $DIR/rename.rs:76:9
    |
 LL | #![warn(clippy::zero_width_space)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::invisible_characters`
 
 error: lint `clippy::clone_double_ref` has been renamed to `suspicious_double_ref_op`
-  --> $DIR/rename.rs:73:9
+  --> $DIR/rename.rs:77:9
    |
 LL | #![warn(clippy::clone_double_ref)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `suspicious_double_ref_op`
 
 error: lint `clippy::drop_bounds` has been renamed to `drop_bounds`
-  --> $DIR/rename.rs:74:9
+  --> $DIR/rename.rs:78:9
    |
 LL | #![warn(clippy::drop_bounds)]
    |         ^^^^^^^^^^^^^^^^^^^ help: use the new name: `drop_bounds`
 
+error: lint `clippy::drop_copy` has been renamed to `drop_copy`
+  --> $DIR/rename.rs:79:9
+   |
+LL | #![warn(clippy::drop_copy)]
+   |         ^^^^^^^^^^^^^^^^^ help: use the new name: `drop_copy`
+
+error: lint `clippy::drop_ref` has been renamed to `drop_ref`
+  --> $DIR/rename.rs:80:9
+   |
+LL | #![warn(clippy::drop_ref)]
+   |         ^^^^^^^^^^^^^^^^ help: use the new name: `drop_ref`
+
 error: lint `clippy::for_loop_over_option` has been renamed to `for_loops_over_fallibles`
-  --> $DIR/rename.rs:75:9
+  --> $DIR/rename.rs:81:9
    |
 LL | #![warn(clippy::for_loop_over_option)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
 
 error: lint `clippy::for_loop_over_result` has been renamed to `for_loops_over_fallibles`
-  --> $DIR/rename.rs:76:9
+  --> $DIR/rename.rs:82:9
    |
 LL | #![warn(clippy::for_loop_over_result)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
 
 error: lint `clippy::for_loops_over_fallibles` has been renamed to `for_loops_over_fallibles`
-  --> $DIR/rename.rs:77:9
+  --> $DIR/rename.rs:83:9
    |
 LL | #![warn(clippy::for_loops_over_fallibles)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
 
+error: lint `clippy::forget_copy` has been renamed to `forget_copy`
+  --> $DIR/rename.rs:84:9
+   |
+LL | #![warn(clippy::forget_copy)]
+   |         ^^^^^^^^^^^^^^^^^^^ help: use the new name: `forget_copy`
+
+error: lint `clippy::forget_ref` has been renamed to `forget_ref`
+  --> $DIR/rename.rs:85:9
+   |
+LL | #![warn(clippy::forget_ref)]
+   |         ^^^^^^^^^^^^^^^^^^ help: use the new name: `forget_ref`
+
 error: lint `clippy::into_iter_on_array` has been renamed to `array_into_iter`
-  --> $DIR/rename.rs:78:9
+  --> $DIR/rename.rs:86:9
    |
 LL | #![warn(clippy::into_iter_on_array)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `array_into_iter`
 
 error: lint `clippy::invalid_atomic_ordering` has been renamed to `invalid_atomic_ordering`
-  --> $DIR/rename.rs:79:9
+  --> $DIR/rename.rs:87:9
    |
 LL | #![warn(clippy::invalid_atomic_ordering)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_atomic_ordering`
 
 error: lint `clippy::invalid_ref` has been renamed to `invalid_value`
-  --> $DIR/rename.rs:80:9
+  --> $DIR/rename.rs:88:9
    |
 LL | #![warn(clippy::invalid_ref)]
    |         ^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_value`
 
 error: lint `clippy::let_underscore_drop` has been renamed to `let_underscore_drop`
-  --> $DIR/rename.rs:81:9
+  --> $DIR/rename.rs:89:9
    |
 LL | #![warn(clippy::let_underscore_drop)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `let_underscore_drop`
 
 error: lint `clippy::mem_discriminant_non_enum` has been renamed to `enum_intrinsics_non_enums`
-  --> $DIR/rename.rs:82:9
+  --> $DIR/rename.rs:90:9
    |
 LL | #![warn(clippy::mem_discriminant_non_enum)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `enum_intrinsics_non_enums`
 
 error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
-  --> $DIR/rename.rs:83:9
+  --> $DIR/rename.rs:91:9
    |
 LL | #![warn(clippy::panic_params)]
    |         ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
 
 error: lint `clippy::positional_named_format_parameters` has been renamed to `named_arguments_used_positionally`
-  --> $DIR/rename.rs:84:9
+  --> $DIR/rename.rs:92:9
    |
 LL | #![warn(clippy::positional_named_format_parameters)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `named_arguments_used_positionally`
 
 error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cstring_as_ptr`
-  --> $DIR/rename.rs:85:9
+  --> $DIR/rename.rs:93:9
    |
 LL | #![warn(clippy::temporary_cstring_as_ptr)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
 
 error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
-  --> $DIR/rename.rs:86:9
+  --> $DIR/rename.rs:94:9
    |
 LL | #![warn(clippy::unknown_clippy_lints)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
 
 error: lint `clippy::unused_label` has been renamed to `unused_labels`
-  --> $DIR/rename.rs:87:9
+  --> $DIR/rename.rs:95:9
    |
 LL | #![warn(clippy::unused_label)]
    |         ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
 
-error: aborting due to 44 previous errors
+error: aborting due to 48 previous errors
 
diff --git a/tests/ui/unknown_clippy_lints.fixed b/tests/ui/unknown_clippy_lints.fixed
index 0c269d650c8..49c0e4dc7eb 100644
--- a/tests/ui/unknown_clippy_lints.fixed
+++ b/tests/ui/unknown_clippy_lints.fixed
@@ -10,7 +10,7 @@
 #[warn(clippy::unnecessary_cast)]
 #[warn(clippy::useless_transmute)]
 // Shouldn't suggest rustc lint name(`dead_code`)
-#[warn(clippy::drop_copy)]
+#[warn(clippy::eq_op)]
 // Shouldn't suggest removed/deprecated clippy lint name(`unused_collect`)
 #[warn(clippy::unused_self)]
 // Shouldn't suggest renamed clippy lint name(`const_static_lifetime`)
diff --git a/tests/ui/unknown_clippy_lints.stderr b/tests/ui/unknown_clippy_lints.stderr
index 421bf5ffa9a..584c428932f 100644
--- a/tests/ui/unknown_clippy_lints.stderr
+++ b/tests/ui/unknown_clippy_lints.stderr
@@ -34,7 +34,7 @@ error: unknown lint: `clippy::dead_cod`
   --> $DIR/unknown_clippy_lints.rs:13:8
    |
 LL | #[warn(clippy::dead_cod)]
-   |        ^^^^^^^^^^^^^^^^ help: did you mean: `clippy::drop_copy`
+   |        ^^^^^^^^^^^^^^^^ help: did you mean: `clippy::eq_op`
 
 error: unknown lint: `clippy::unused_colle`
   --> $DIR/unknown_clippy_lints.rs:15:8