Merge remote-tracking branch 'upstream/master' into only_used_in_recursion

# Conflicts:
#	clippy_lints/src/lib.rs

Author: buttercrab

clippy_lints/src/dbg_macro.rs

@@ -1,11 +1,11 @@
-use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_sugg};
-use clippy_utils::source::snippet_opt;
-use rustc_ast::ast;
-use rustc_ast::tokenstream::TokenStream;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::macros::root_macro_call_first_node;
+use clippy_utils::source::snippet_with_applicability;
 use rustc_errors::Applicability;
-use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::source_map::Span;
+use rustc_span::sym;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -15,14 +15,6 @@ declare_clippy_lint! {
     /// `dbg!` macro is intended as a debugging tool. It
     /// should not be in version control.
     ///
-    /// ### Known problems
-    /// * The lint level is unaffected by crate attributes. The level can still
-    ///   be set for functions, modules and other items. To change the level for
-    ///   the entire crate, please use command line flags. More information and a
-    ///   configuration example can be found in [clippy#6610].
-    ///
-    /// [clippy#6610]: https://github.com/rust-lang/rust-clippy/issues/6610#issuecomment-977120558
-    ///
     /// ### Example
     /// ```rust,ignore
     /// // Bad
@@ -39,37 +31,52 @@ declare_clippy_lint! {
 
 declare_lint_pass!(DbgMacro => [DBG_MACRO]);
 
-impl EarlyLintPass for DbgMacro {
-    fn check_mac(&mut self, cx: &EarlyContext<'_>, mac: &ast::MacCall) {
-        if mac.path == sym!(dbg) {
-            if let Some(sugg) = tts_span(mac.args.inner_tokens()).and_then(|span| snippet_opt(cx, span)) {
-                span_lint_and_sugg(
-                    cx,
-                    DBG_MACRO,
-                    mac.span(),
-                    "`dbg!` macro is intended as a debugging tool",
-                    "ensure to avoid having uses of it in version control",
-                    sugg,
-                    Applicability::MaybeIncorrect,
-                );
-            } else {
-                span_lint_and_help(
-                    cx,
-                    DBG_MACRO,
-                    mac.span(),
-                    "`dbg!` macro is intended as a debugging tool",
-                    None,
-                    "ensure to avoid having uses of it in version control",
-                );
-            }
+impl LateLintPass<'_> for DbgMacro {
+    fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+        let Some(macro_call) = root_macro_call_first_node(cx, expr) else { return };
+        if cx.tcx.is_diagnostic_item(sym::dbg_macro, macro_call.def_id) {
+            let mut applicability = Applicability::MachineApplicable;
+            let suggestion = match expr.peel_drop_temps().kind {
+                // dbg!()
+                ExprKind::Block(_, _) => String::new(),
+                // dbg!(1)
+                ExprKind::Match(val, ..) => {
+                    snippet_with_applicability(cx, val.span.source_callsite(), "..", &mut applicability).to_string()
+                },
+                // dbg!(2, 3)
+                ExprKind::Tup(
+                    [
+                        Expr {
+                            kind: ExprKind::Match(first, ..),
+                            ..
+                        },
+                        ..,
+                        Expr {
+                            kind: ExprKind::Match(last, ..),
+                            ..
+                        },
+                    ],
+                ) => {
+                    let snippet = snippet_with_applicability(
+                        cx,
+                        first.span.source_callsite().to(last.span.source_callsite()),
+                        "..",
+                        &mut applicability,
+                    );
+                    format!("({snippet})")
+                },
+                _ => return,
+            };
+
+            span_lint_and_sugg(
+                cx,
+                DBG_MACRO,
+                macro_call.span,
+                "`dbg!` macro is intended as a debugging tool",
+                "ensure to avoid having uses of it in version control",
+                suggestion,
+                applicability,
+            );
         }
     }
 }
-
-// Get span enclosing entire the token stream.
-fn tts_span(tts: TokenStream) -> Option<Span> {
-    let mut cursor = tts.into_trees();
-    let first = cursor.next()?.span();
-    let span = cursor.last().map_or(first, |tree| first.to(tree.span()));
-    Some(span)
-}

clippy_lints/src/dereference.rs

@@ -12,7 +12,7 @@ use rustc_hir::{
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
-use rustc_middle::ty::{self, Ty, TyCtxt, TyS, TypeckResults};
+use rustc_middle::ty::{self, Ty, TyCtxt, TypeckResults};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::{symbol::sym, Span};
 
@@ -448,7 +448,7 @@ fn try_parse_ref_op<'tcx>(
 // the reference.
 fn deref_method_same_type(result_ty: Ty<'_>, arg_ty: Ty<'_>) -> bool {
     match (result_ty.kind(), arg_ty.kind()) {
-        (ty::Ref(_, result_ty, _), ty::Ref(_, arg_ty, _)) => TyS::same_type(result_ty, arg_ty),
+        (ty::Ref(_, result_ty, _), ty::Ref(_, arg_ty, _)) => result_ty == arg_ty,
 
         // The result type for a deref method is always a reference
         // Not matching the previous pattern means the argument type is not a reference

clippy_lints/src/implicit_hasher.rs

@@ -8,7 +8,7 @@ use rustc_hir::{Body, Expr, ExprKind, GenericArg, Item, ItemKind, QPath, TyKind}
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::lint::in_external_macro;
-use rustc_middle::ty::{Ty, TyS, TypeckResults};
+use rustc_middle::ty::{Ty, TypeckResults};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::symbol::sym;
@@ -345,7 +345,7 @@ impl<'a, 'b, 'tcx> Visitor<'tcx> for ImplicitHasherConstructorVisitor<'a, 'b, 't
             if let TyKind::Path(QPath::Resolved(None, ty_path)) = ty.kind;
             if let Some(ty_did) = ty_path.res.opt_def_id();
             then {
-                if !TyS::same_type(self.target.ty(), self.maybe_typeck_results.unwrap().expr_ty(e)) {
+                if self.target.ty() != self.maybe_typeck_results.unwrap().expr_ty(e) {
                     return;
                 }
 

clippy_lints/src/index_refutable_slice.rs

@@ -4,7 +4,7 @@ use clippy_utils::higher::IfLet;
 use clippy_utils::ty::is_copy;
 use clippy_utils::{is_expn_of, is_lint_allowed, meets_msrv, msrvs, path_to_local};
 use if_chain::if_chain;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{self, Visitor};
@@ -92,9 +92,9 @@ impl<'tcx> LateLintPass<'tcx> for IndexRefutableSlice {
     extract_msrv_attr!(LateContext);
 }
 
-fn find_slice_values(cx: &LateContext<'_>, pat: &hir::Pat<'_>) -> FxHashMap<hir::HirId, SliceLintInformation> {
+fn find_slice_values(cx: &LateContext<'_>, pat: &hir::Pat<'_>) -> FxIndexMap<hir::HirId, SliceLintInformation> {
     let mut removed_pat: FxHashSet<hir::HirId> = FxHashSet::default();
-    let mut slices: FxHashMap<hir::HirId, SliceLintInformation> = FxHashMap::default();
+    let mut slices: FxIndexMap<hir::HirId, SliceLintInformation> = FxIndexMap::default();
     pat.walk_always(|pat| {
         if let hir::PatKind::Binding(binding, value_hir_id, ident, sub_pat) = pat.kind {
             // We'll just ignore mut and ref mut for simplicity sake right now
@@ -208,10 +208,10 @@ impl SliceLintInformation {
 
 fn filter_lintable_slices<'a, 'tcx>(
     cx: &'a LateContext<'tcx>,
-    slice_lint_info: FxHashMap<hir::HirId, SliceLintInformation>,
+    slice_lint_info: FxIndexMap<hir::HirId, SliceLintInformation>,
     max_suggested_slice: u64,
     scope: &'tcx hir::Expr<'tcx>,
-) -> FxHashMap<hir::HirId, SliceLintInformation> {
+) -> FxIndexMap<hir::HirId, SliceLintInformation> {
     let mut visitor = SliceIndexLintingVisitor {
         cx,
         slice_lint_info,
@@ -225,7 +225,7 @@ fn filter_lintable_slices<'a, 'tcx>(
 
 struct SliceIndexLintingVisitor<'a, 'tcx> {
     cx: &'a LateContext<'tcx>,
-    slice_lint_info: FxHashMap<hir::HirId, SliceLintInformation>,
+    slice_lint_info: FxIndexMap<hir::HirId, SliceLintInformation>,
     max_suggested_slice: u64,
 }
 

clippy_lints/src/len_zero.rs

@@ -10,7 +10,7 @@ use rustc_hir::{
     ItemKind, Mutability, Node, TraitItemRef, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_middle::ty::{self, AssocKind, FnSig, Ty, TyS};
+use rustc_middle::ty::{self, AssocKind, FnSig, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{
     source_map::{Span, Spanned, Symbol},
@@ -265,7 +265,7 @@ impl LenOutput<'_> {
             (_, &ty::Bool) => true,
             (Self::Option(id), &ty::Adt(adt, subs)) if id == adt.did => subs.type_at(0).is_bool(),
             (Self::Result(id, err_ty), &ty::Adt(adt, subs)) if id == adt.did => {
-                subs.type_at(0).is_bool() && TyS::same_type(subs.type_at(1), err_ty)
+                subs.type_at(0).is_bool() && subs.type_at(1) == err_ty
             },
             _ => false,
         }

clippy_lints/src/lib.register_all.rs

@@ -278,7 +278,6 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(transmute::TRANSMUTE_INT_TO_FLOAT),
     LintId::of(transmute::TRANSMUTE_NUM_TO_BYTES),
     LintId::of(transmute::TRANSMUTE_PTR_TO_REF),
-    LintId::of(transmute::TRANSMUTE_UNDEFINED_REPR),
     LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
     LintId::of(transmute::WRONG_TRANSMUTE),
     LintId::of(transmuting_null::TRANSMUTING_NULL),

clippy_lints/src/lib.register_correctness.rs

@@ -58,7 +58,6 @@ store.register_group(true, "clippy::correctness", Some("clippy_correctness"), ve
     LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),
     LintId::of(swap::ALMOST_SWAPPED),
     LintId::of(to_string_in_display::TO_STRING_IN_DISPLAY),
-    LintId::of(transmute::TRANSMUTE_UNDEFINED_REPR),
     LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
     LintId::of(transmute::WRONG_TRANSMUTE),
     LintId::of(transmuting_null::TRANSMUTING_NULL),

clippy_lints/src/lib.register_nursery.rs

@@ -26,6 +26,7 @@ store.register_group(true, "clippy::nursery", Some("clippy_nursery"), vec![
     LintId::of(strings::STRING_LIT_AS_BYTES),
     LintId::of(suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS),
     LintId::of(trailing_empty_array::TRAILING_EMPTY_ARRAY),
+    LintId::of(transmute::TRANSMUTE_UNDEFINED_REPR),
     LintId::of(transmute::USELESS_TRANSMUTE),
     LintId::of(use_self::USE_SELF),
 ])

clippy_lints/src/lib.rs

@@ -18,6 +18,8 @@
 #![warn(rust_2018_idioms, unused_lifetimes)]
 // warn on rustc internal lints
 #![warn(rustc::internal)]
+// Disable this rustc lint for now, as it was also done in rustc
+#![allow(rustc::potential_query_instability)]
 
 // FIXME: switch to something more ergonomic here, once available.
 // (Currently there is no way to opt into sysroot crates without `extern crate`.)
@@ -431,7 +433,6 @@ pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, sess: &Se
 
     store.register_pre_expansion_pass(|| Box::new(write::Write::default()));
     store.register_pre_expansion_pass(move || Box::new(attrs::EarlyAttributes { msrv }));
-    store.register_pre_expansion_pass(|| Box::new(dbg_macro::DbgMacro));
 }
 
 #[doc(hidden)]
@@ -864,6 +865,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(move || Box::new(manual_bits::ManualBits::new(msrv)));
     store.register_late_pass(|| Box::new(default_union_representation::DefaultUnionRepresentation));
     store.register_late_pass(|| Box::new(only_used_in_recursion::OnlyUsedInRecursion));
+    store.register_late_pass(|| Box::new(dbg_macro::DbgMacro));
     // add lints here, do not remove this comment, it's used in `new_lint`
 }
 

clippy_lints/src/loops/explicit_into_iter_loop.rs

@@ -5,13 +5,12 @@ use clippy_utils::source::snippet_with_applicability;
 use rustc_errors::Applicability;
 use rustc_hir::Expr;
 use rustc_lint::LateContext;
-use rustc_middle::ty::TyS;
 use rustc_span::symbol::sym;
 
 pub(super) fn check(cx: &LateContext<'_>, self_arg: &Expr<'_>, call_expr: &Expr<'_>) {
     let self_ty = cx.typeck_results().expr_ty(self_arg);
     let self_ty_adjusted = cx.typeck_results().expr_ty_adjusted(self_arg);
-    if !(TyS::same_type(self_ty, self_ty_adjusted) && is_trait_method(cx, call_expr, sym::IntoIterator)) {
+    if !(self_ty == self_ty_adjusted && is_trait_method(cx, call_expr, sym::IntoIterator)) {
         return;
     }