Rollup merge of rust-lang#97289 - compiler-errors:tcxify-clippy, r=Ma…

…rk-Simulacrum

Lifetime variance fixes for clippy

rust-lang#97287 migrates rustc to a `Ty` type that is invariant over its lifetime `'tcx`, so I need to fix a bunch of places that assume that `Ty<'a>` and `Ty<'b>` can be shortened to some common lifetime.

This is doable, since everything is already `'tcx`, so all this PR does is be a bit more explicit that elided lifetimes are actually `'tcx`.

Split out from rust-lang#97287 so the clippy team can review independently.

src/tools/clippy/clippy_lints/src/casts/unnecessary_cast.rs

@@ -12,12 +12,12 @@ use rustc_middle::ty::{self, FloatTy, InferTy, Ty};
 
 use super::UNNECESSARY_CAST;
 
-pub(super) fn check(
-    cx: &LateContext<'_>,
-    expr: &Expr<'_>,
-    cast_expr: &Expr<'_>,
-    cast_from: Ty<'_>,
-    cast_to: Ty<'_>,
+pub(super) fn check<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &Expr<'tcx>,
+    cast_expr: &Expr<'tcx>,
+    cast_from: Ty<'tcx>,
+    cast_to: Ty<'tcx>,
 ) -> bool {
     // skip non-primitive type cast
     if_chain! {

src/tools/clippy/clippy_lints/src/dereference.rs

@@ -446,7 +446,7 @@ fn try_parse_ref_op<'tcx>(
 
 // Checks whether the type for a deref call actually changed the type, not just the mutability of
 // the reference.
-fn deref_method_same_type(result_ty: Ty<'_>, arg_ty: Ty<'_>) -> bool {
+fn deref_method_same_type<'tcx>(result_ty: Ty<'tcx>, arg_ty: Ty<'tcx>) -> bool {
     match (result_ty.kind(), arg_ty.kind()) {
         (ty::Ref(_, result_ty, _), ty::Ref(_, arg_ty, _)) => result_ty == arg_ty,
 
@@ -541,8 +541,8 @@ fn is_auto_borrow_position(parent: Option<Node<'_>>, child_id: HirId) -> bool {
 /// Adjustments are sometimes made in the parent block rather than the expression itself.
 fn find_adjustments<'tcx>(
     tcx: TyCtxt<'tcx>,
-    typeck: &'tcx TypeckResults<'_>,
-    expr: &'tcx Expr<'_>,
+    typeck: &'tcx TypeckResults<'tcx>,
+    expr: &'tcx Expr<'tcx>,
 ) -> &'tcx [Adjustment<'tcx>] {
     let map = tcx.hir();
     let mut iter = map.parent_iter(expr.hir_id);
@@ -581,7 +581,7 @@ fn find_adjustments<'tcx>(
 }
 
 #[expect(clippy::needless_pass_by_value)]
-fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData) {
+fn report<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>, state: State, data: StateData) {
     match state {
         State::DerefMethod {
             ty_changed_count,
@@ -656,7 +656,7 @@ fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData)
 }
 
 impl Dereferencing {
-    fn check_local_usage(&mut self, cx: &LateContext<'_>, e: &Expr<'_>, local: HirId) {
+    fn check_local_usage<'tcx>(&mut self, cx: &LateContext<'tcx>, e: &Expr<'tcx>, local: HirId) {
         if let Some(outer_pat) = self.ref_locals.get_mut(&local) {
             if let Some(pat) = outer_pat {
                 // Check for auto-deref

src/tools/clippy/clippy_lints/src/len_zero.rs

@@ -259,8 +259,8 @@ fn parse_len_output<'tcx>(cx: &LateContext<'_>, sig: FnSig<'tcx>) -> Option<LenO
     }
 }
 
-impl LenOutput<'_> {
-    fn matches_is_empty_output(self, ty: Ty<'_>) -> bool {
+impl<'tcx> LenOutput<'tcx> {
+    fn matches_is_empty_output(self, ty: Ty<'tcx>) -> bool {
         match (self, ty.kind()) {
             (_, &ty::Bool) => true,
             (Self::Option(id), &ty::Adt(adt, subs)) if id == adt.did() => subs.type_at(0).is_bool(),
@@ -292,7 +292,7 @@ impl LenOutput<'_> {
 }
 
 /// Checks if the given signature matches the expectations for `is_empty`
-fn check_is_empty_sig(sig: FnSig<'_>, self_kind: ImplicitSelfKind, len_output: LenOutput<'_>) -> bool {
+fn check_is_empty_sig<'tcx>(sig: FnSig<'tcx>, self_kind: ImplicitSelfKind, len_output: LenOutput<'tcx>) -> bool {
     match &**sig.inputs_and_output {
         [arg, res] if len_output.matches_is_empty_output(*res) => {
             matches!(
@@ -306,11 +306,11 @@ fn check_is_empty_sig(sig: FnSig<'_>, self_kind: ImplicitSelfKind, len_output: L
 }
 
 /// Checks if the given type has an `is_empty` method with the appropriate signature.
-fn check_for_is_empty(
-    cx: &LateContext<'_>,
+fn check_for_is_empty<'tcx>(
+    cx: &LateContext<'tcx>,
     span: Span,
     self_kind: ImplicitSelfKind,
-    output: LenOutput<'_>,
+    output: LenOutput<'tcx>,
     impl_ty: DefId,
     item_name: Symbol,
     item_kind: &str,

src/tools/clippy/clippy_lints/src/methods/mod.rs

@@ -2843,7 +2843,7 @@ enum SelfKind {
 
 impl SelfKind {
     fn matches<'a>(self, cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
-        fn matches_value<'a>(cx: &LateContext<'a>, parent_ty: Ty<'_>, ty: Ty<'_>) -> bool {
+        fn matches_value<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
             if ty == parent_ty {
                 true
             } else if ty.is_box() {

src/tools/clippy/clippy_lints/src/ptr.rs

@@ -395,9 +395,9 @@ impl<'tcx> DerefTy<'tcx> {
 
 fn check_fn_args<'cx, 'tcx: 'cx>(
     cx: &'cx LateContext<'tcx>,
-    tys: &'tcx [Ty<'_>],
-    hir_tys: &'tcx [hir::Ty<'_>],
-    params: &'tcx [Param<'_>],
+    tys: &'tcx [Ty<'tcx>],
+    hir_tys: &'tcx [hir::Ty<'tcx>],
+    params: &'tcx [Param<'tcx>],
 ) -> impl Iterator<Item = PtrArg<'tcx>> + 'cx {
     tys.iter()
         .zip(hir_tys.iter())

src/tools/clippy/clippy_lints/src/transmute/transmute_undefined_repr.rs

@@ -358,7 +358,7 @@ fn is_size_pair(ty: Ty<'_>) -> bool {
     }
 }
 
-fn same_except_params(subs1: SubstsRef<'_>, subs2: SubstsRef<'_>) -> bool {
+fn same_except_params<'tcx>(subs1: SubstsRef<'tcx>, subs2: SubstsRef<'tcx>) -> bool {
     // TODO: check const parameters as well. Currently this will consider `Array<5>` the same as
     // `Array<6>`
     for (ty1, ty2) in subs1.types().zip(subs2.types()).filter(|(ty1, ty2)| ty1 != ty2) {

src/tools/clippy/clippy_utils/src/ty.rs

@@ -42,7 +42,7 @@ pub fn can_partially_move_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool
 }
 
 /// Walks into `ty` and returns `true` if any inner type is the same as `other_ty`
-pub fn contains_ty(ty: Ty<'_>, other_ty: Ty<'_>) -> bool {
+pub fn contains_ty<'tcx>(ty: Ty<'tcx>, other_ty: Ty<'tcx>) -> bool {
     ty.walk().any(|inner| match inner.unpack() {
         GenericArgKind::Type(inner_ty) => other_ty == inner_ty,
         GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
@@ -51,7 +51,7 @@ pub fn contains_ty(ty: Ty<'_>, other_ty: Ty<'_>) -> bool {
 
 /// Walks into `ty` and returns `true` if any inner type is an instance of the given adt
 /// constructor.
-pub fn contains_adt_constructor(ty: Ty<'_>, adt: AdtDef<'_>) -> bool {
+pub fn contains_adt_constructor<'tcx>(ty: Ty<'tcx>, adt: AdtDef<'tcx>) -> bool {
     ty.walk().any(|inner| match inner.unpack() {
         GenericArgKind::Type(inner_ty) => inner_ty.ty_adt_def() == Some(adt),
         GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,