Auto merge of #8190 - camsteffen:no-in-band-liftetimes, r=flip1995

Stop using `in_band_lifetimes`

Per rust-lang/rust#91867

changelog: none

clippy_lints/src/bool_assert_comparison.rs

@@ -42,7 +42,7 @@ fn is_bool_lit(e: &Expr<'_>) -> bool {
     ) && !e.span.from_expansion()
 }
 
-fn is_impl_not_trait_with_bool_out(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
+fn is_impl_not_trait_with_bool_out(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
     let ty = cx.typeck_results().expr_ty(e);
 
     cx.tcx

clippy_lints/src/case_sensitive_file_extension_comparisons.rs

@@ -67,7 +67,7 @@ fn check_case_sensitive_file_extension_comparison(ctx: &LateContext<'_>, expr: &
     None
 }
 
-impl LateLintPass<'tcx> for CaseSensitiveFileExtensionComparisons {
+impl<'tcx> LateLintPass<'tcx> for CaseSensitiveFileExtensionComparisons {
     fn check_expr(&mut self, ctx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         if let Some(span) = check_case_sensitive_file_extension_comparison(ctx, expr) {
             span_lint_and_help(

clippy_lints/src/casts/cast_ptr_alignment.rs

@@ -9,7 +9,7 @@ use rustc_span::symbol::sym;
 
 use super::CAST_PTR_ALIGNMENT;
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
     if let ExprKind::Cast(cast_expr, cast_to) = expr.kind {
         if is_hir_ty_cfg_dependant(cx, cast_to) {
             return;

clippy_lints/src/casts/cast_ref_to_mut.rs

@@ -6,7 +6,7 @@ use rustc_middle::ty;
 
 use super::CAST_REF_TO_MUT;
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
     if_chain! {
         if let ExprKind::Unary(UnOp::Deref, e) = &expr.kind;
         if let ExprKind::Cast(e, t) = &e.kind;

clippy_lints/src/casts/char_lit_as_u8.rs

@@ -9,7 +9,7 @@ use rustc_middle::ty::{self, UintTy};
 
 use super::CHAR_LIT_AS_U8;
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
     if_chain! {
         if let ExprKind::Cast(e, _) = &expr.kind;
         if let ExprKind::Lit(l) = &e.kind;

clippy_lints/src/casts/ptr_as_ptr.rs

@@ -12,7 +12,7 @@ use rustc_semver::RustcVersion;
 
 use super::PTR_AS_PTR;
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: &Option<RustcVersion>) {
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, msrv: &Option<RustcVersion>) {
     if !meets_msrv(msrv.as_ref(), &msrvs::POINTER_CAST) {
         return;
     }

clippy_lints/src/copies.rs

@@ -316,7 +316,7 @@ struct BlockEqual {
 
 /// This function can also trigger the `IF_SAME_THEN_ELSE` in which case it'll return `None` to
 /// abort any further processing and avoid duplicate lint triggers.
-fn scan_block_for_eq(cx: &LateContext<'tcx>, blocks: &[&Block<'tcx>]) -> Option<BlockEqual> {
+fn scan_block_for_eq(cx: &LateContext<'_>, blocks: &[&Block<'_>]) -> Option<BlockEqual> {
     let mut start_eq = usize::MAX;
     let mut end_eq = usize::MAX;
     let mut expr_eq = true;
@@ -385,11 +385,7 @@ fn scan_block_for_eq(cx: &LateContext<'tcx>, blocks: &[&Block<'tcx>]) -> Option<
     })
 }
 
-fn check_for_warn_of_moved_symbol(
+fn check_for_warn_of_moved_symbol(cx: &LateContext<'_>, symbols: &FxHashSet<Symbol>, if_expr: &Expr<'_>) -> bool {
-    cx: &LateContext<'tcx>,
-    symbols: &FxHashSet<Symbol>,
-    if_expr: &'tcx Expr<'_>,
-) -> bool {
     get_enclosing_block(cx, if_expr.hir_id).map_or(false, |block| {
         let ignore_span = block.span.shrink_to_lo().to(if_expr.span);
 
@@ -419,13 +415,13 @@ fn check_for_warn_of_moved_symbol(
 }
 
 fn emit_branches_sharing_code_lint(
-    cx: &LateContext<'tcx>,
+    cx: &LateContext<'_>,
     start_stmts: usize,
     end_stmts: usize,
     lint_end: bool,
     warn_about_moved_symbol: bool,
-    blocks: &[&Block<'tcx>],
+    blocks: &[&Block<'_>],
-    if_expr: &'tcx Expr<'_>,
+    if_expr: &Expr<'_>,
 ) {
     if start_stmts == 0 && !lint_end {
         return;

clippy_lints/src/default.rs

@@ -77,7 +77,7 @@ pub struct Default {
 
 impl_lint_pass!(Default => [DEFAULT_TRAIT_ACCESS, FIELD_REASSIGN_WITH_DEFAULT]);
 
-impl LateLintPass<'_> for Default {
+impl<'tcx> LateLintPass<'tcx> for Default {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if_chain! {
             if !expr.span.from_expansion();
@@ -110,7 +110,7 @@ impl LateLintPass<'_> for Default {
     }
 
     #[allow(clippy::too_many_lines)]
-    fn check_block<'tcx>(&mut self, cx: &LateContext<'tcx>, block: &Block<'tcx>) {
+    fn check_block(&mut self, cx: &LateContext<'tcx>, block: &Block<'tcx>) {
         // start from the `let mut _ = _::default();` and look at all the following
         // statements, see if they re-assign the fields of the binding
         let stmts_head = match block.stmts {

clippy_lints/src/default_numeric_fallback.rs

@@ -54,7 +54,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(DefaultNumericFallback => [DEFAULT_NUMERIC_FALLBACK]);
 
-impl LateLintPass<'_> for DefaultNumericFallback {
+impl<'tcx> LateLintPass<'tcx> for DefaultNumericFallback {
     fn check_body(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
         let mut visitor = NumericFallbackVisitor::new(cx);
         visitor.visit_body(body);

clippy_lints/src/dereference.rs

@@ -355,7 +355,7 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing {
     }
 }
 
-fn try_parse_ref_op(
+fn try_parse_ref_op<'tcx>(
     tcx: TyCtxt<'tcx>,
     typeck: &'tcx TypeckResults<'_>,
     expr: &'tcx Expr<'_>,
@@ -387,7 +387,7 @@ fn try_parse_ref_op(
 
 // 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<'tcx>, arg_ty: Ty<'tcx>) -> bool {
+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),
 
@@ -457,7 +457,7 @@ fn is_linted_explicit_deref_position(parent: Option<Node<'_>>, child_id: HirId,
 }
 
 /// Adjustments are sometimes made in the parent block rather than the expression itself.
-fn find_adjustments(
+fn find_adjustments<'tcx>(
     tcx: TyCtxt<'tcx>,
     typeck: &'tcx TypeckResults<'_>,
     expr: &'tcx Expr<'_>,
@@ -499,7 +499,7 @@ fn find_adjustments(
 }
 
 #[allow(clippy::needless_pass_by_value)]
-fn report(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, state: State, data: StateData) {
+fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData) {
     match state {
         State::DerefMethod {
             ty_changed_count,
@@ -568,7 +568,7 @@ fn report(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, state: State, data: Stat
 }
 
 impl Dereferencing {
-    fn check_local_usage(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, local: HirId) {
+    fn check_local_usage(&mut self, cx: &LateContext<'_>, e: &Expr<'_>, local: HirId) {
         if let Some(outer_pat) = self.ref_locals.get_mut(&local) {
             if let Some(pat) = outer_pat {
                 // Check for auto-deref

clippy_lints/src/entry.rs

@@ -233,7 +233,7 @@ struct ContainsExpr<'tcx> {
     key: &'tcx Expr<'tcx>,
     call_ctxt: SyntaxContext,
 }
-fn try_parse_contains(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Option<(MapType, ContainsExpr<'tcx>)> {
+fn try_parse_contains<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Option<(MapType, ContainsExpr<'tcx>)> {
     let mut negated = false;
     let expr = peel_hir_expr_while(expr, |e| match e.kind {
         ExprKind::Unary(UnOp::Not, e) => {
@@ -280,7 +280,7 @@ struct InsertExpr<'tcx> {
     key: &'tcx Expr<'tcx>,
     value: &'tcx Expr<'tcx>,
 }
-fn try_parse_insert(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<InsertExpr<'tcx>> {
+fn try_parse_insert<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<InsertExpr<'tcx>> {
     if let ExprKind::MethodCall(_, _, [map, key, value], _) = expr.kind {
         let id = cx.typeck_results().type_dependent_def_id(expr.hir_id)?;
         if match_def_path(cx, id, &paths::BTREEMAP_INSERT) || match_def_path(cx, id, &paths::HASHMAP_INSERT) {
@@ -301,7 +301,7 @@ enum Edit<'tcx> {
     /// An insertion into the map.
     Insertion(Insertion<'tcx>),
 }
-impl Edit<'tcx> {
+impl<'tcx> Edit<'tcx> {
     fn as_insertion(self) -> Option<Insertion<'tcx>> {
         if let Self::Insertion(i) = self { Some(i) } else { None }
     }
@@ -532,7 +532,7 @@ struct InsertSearchResults<'tcx> {
     allow_insert_closure: bool,
     is_single_insert: bool,
 }
-impl InsertSearchResults<'tcx> {
+impl<'tcx> InsertSearchResults<'tcx> {
     fn as_single_insertion(&self) -> Option<Insertion<'tcx>> {
         self.is_single_insert.then(|| self.edits[0].as_insertion().unwrap())
     }
@@ -633,7 +633,7 @@ impl InsertSearchResults<'tcx> {
     }
 }
 
-fn find_insert_calls(
+fn find_insert_calls<'tcx>(
     cx: &LateContext<'tcx>,
     contains_expr: &ContainsExpr<'tcx>,
     expr: &'tcx Expr<'_>,

clippy_lints/src/equatable_if_let.rs

@@ -56,7 +56,7 @@ fn unary_pattern(pat: &Pat<'_>) -> bool {
     }
 }
 
-fn is_structural_partial_eq(cx: &LateContext<'tcx>, ty: Ty<'tcx>, other: Ty<'tcx>) -> bool {
+fn is_structural_partial_eq<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, other: Ty<'tcx>) -> bool {
     if let Some(def_id) = cx.tcx.lang_items().eq_trait() {
         implements_trait(cx, ty, def_id, &[other.into()])
     } else {

clippy_lints/src/erasing_op.rs

@@ -50,13 +50,19 @@ impl<'tcx> LateLintPass<'tcx> for ErasingOp {
     }
 }
 
-fn different_types(tck: &TypeckResults<'tcx>, input: &'tcx Expr<'_>, output: &'tcx Expr<'_>) -> bool {
+fn different_types(tck: &TypeckResults<'_>, input: &Expr<'_>, output: &Expr<'_>) -> bool {
     let input_ty = tck.expr_ty(input).peel_refs();
     let output_ty = tck.expr_ty(output).peel_refs();
     !same_type_and_consts(input_ty, output_ty)
 }
 
-fn check(cx: &LateContext<'cx>, tck: &TypeckResults<'cx>, op: &Expr<'cx>, other: &Expr<'cx>, parent: &Expr<'cx>) {
+fn check<'tcx>(
+    cx: &LateContext<'tcx>,
+    tck: &TypeckResults<'tcx>,
+    op: &Expr<'tcx>,
+    other: &Expr<'tcx>,
+    parent: &Expr<'tcx>,
+) {
     if constant_simple(cx, tck, op) == Some(Constant::Int(0)) {
         if different_types(tck, other, parent) {
             return;

clippy_lints/src/from_over_into.rs

@@ -53,7 +53,7 @@ impl FromOverInto {
 
 impl_lint_pass!(FromOverInto => [FROM_OVER_INTO]);
 
-impl LateLintPass<'_> for FromOverInto {
+impl<'tcx> LateLintPass<'tcx> for FromOverInto {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
         if !meets_msrv(self.msrv.as_ref(), &msrvs::RE_REBALANCING_COHERENCE) {
             return;

clippy_lints/src/from_str_radix_10.rs

@@ -43,7 +43,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(FromStrRadix10 => [FROM_STR_RADIX_10]);
 
-impl LateLintPass<'tcx> for FromStrRadix10 {
+impl<'tcx> LateLintPass<'tcx> for FromStrRadix10 {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, exp: &Expr<'tcx>) {
         if_chain! {
             if let ExprKind::Call(maybe_path, arguments) = &exp.kind;

clippy_lints/src/functions/must_use.rs

@@ -18,7 +18,7 @@ use clippy_utils::{match_def_path, must_use_attr, return_ty, trait_ref_of_method
 
 use super::{DOUBLE_MUST_USE, MUST_USE_CANDIDATE, MUST_USE_UNIT};
 
-pub(super) fn check_item(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
+pub(super) fn check_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
     let attrs = cx.tcx.hir().attrs(item.hir_id());
     let attr = must_use_attr(attrs);
     if let hir::ItemKind::Fn(ref sig, ref _generics, ref body_id) = item.kind {
@@ -40,7 +40,7 @@ pub(super) fn check_item(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
     }
 }
 
-pub(super) fn check_impl_item(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
+pub(super) fn check_impl_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
     if let hir::ImplItemKind::Fn(ref sig, ref body_id) = item.kind {
         let is_public = cx.access_levels.is_exported(item.def_id);
         let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
@@ -62,7 +62,7 @@ pub(super) fn check_impl_item(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<
     }
 }
 
-pub(super) fn check_trait_item(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
+pub(super) fn check_trait_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
     if let hir::TraitItemKind::Fn(ref sig, ref eid) = item.kind {
         let is_public = cx.access_levels.is_exported(item.def_id);
         let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());

clippy_lints/src/functions/not_unsafe_ptr_arg_deref.rs

@@ -9,7 +9,7 @@ use clippy_utils::{iter_input_pats, path_to_local};
 
 use super::NOT_UNSAFE_PTR_ARG_DEREF;
 
-pub(super) fn check_fn(
+pub(super) fn check_fn<'tcx>(
     cx: &LateContext<'tcx>,
     kind: intravisit::FnKind<'tcx>,
     decl: &'tcx hir::FnDecl<'tcx>,
@@ -25,14 +25,14 @@ pub(super) fn check_fn(
     check_raw_ptr(cx, unsafety, decl, body, cx.tcx.hir().local_def_id(hir_id));
 }
 
-pub(super) fn check_trait_item(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
+pub(super) fn check_trait_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
     if let hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Provided(eid)) = item.kind {
         let body = cx.tcx.hir().body(eid);
         check_raw_ptr(cx, sig.header.unsafety, sig.decl, body, item.def_id);
     }
 }
 
-fn check_raw_ptr(
+fn check_raw_ptr<'tcx>(
     cx: &LateContext<'tcx>,
     unsafety: hir::Unsafety,
     decl: &'tcx hir::FnDecl<'tcx>,

clippy_lints/src/functions/result_unit_err.rs

@@ -13,7 +13,7 @@ use clippy_utils::ty::is_type_diagnostic_item;
 
 use super::RESULT_UNIT_ERR;
 
-pub(super) fn check_item(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
+pub(super) fn check_item(cx: &LateContext<'_>, item: &hir::Item<'_>) {
     if let hir::ItemKind::Fn(ref sig, ref _generics, _) = item.kind {
         let is_public = cx.access_levels.is_exported(item.def_id);
         let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
@@ -23,7 +23,7 @@ pub(super) fn check_item(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
     }
 }
 
-pub(super) fn check_impl_item(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
+pub(super) fn check_impl_item(cx: &LateContext<'_>, item: &hir::ImplItem<'_>) {
     if let hir::ImplItemKind::Fn(ref sig, _) = item.kind {
         let is_public = cx.access_levels.is_exported(item.def_id);
         let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
@@ -33,7 +33,7 @@ pub(super) fn check_impl_item(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<
     }
 }
 
-pub(super) fn check_trait_item(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
+pub(super) fn check_trait_item(cx: &LateContext<'_>, item: &hir::TraitItem<'_>) {
     if let hir::TraitItemKind::Fn(ref sig, _) = item.kind {
         let is_public = cx.access_levels.is_exported(item.def_id);
         let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());

clippy_lints/src/functions/too_many_arguments.rs

@@ -9,9 +9,9 @@ use clippy_utils::is_trait_impl_item;
 use super::TOO_MANY_ARGUMENTS;
 
 pub(super) fn check_fn(
-    cx: &LateContext<'tcx>,
+    cx: &LateContext<'_>,
-    kind: intravisit::FnKind<'tcx>,
+    kind: intravisit::FnKind<'_>,
-    decl: &'tcx hir::FnDecl<'_>,
+    decl: &hir::FnDecl<'_>,
     span: Span,
     hir_id: hir::HirId,
     too_many_arguments_threshold: u64,
@@ -39,11 +39,7 @@ pub(super) fn check_fn(
     }
 }
 
-pub(super) fn check_trait_item(
+pub(super) fn check_trait_item(cx: &LateContext<'_>, item: &hir::TraitItem<'_>, too_many_arguments_threshold: u64) {
-    cx: &LateContext<'tcx>,
-    item: &'tcx hir::TraitItem<'_>,
-    too_many_arguments_threshold: u64,
-) {
     if let hir::TraitItemKind::Fn(ref sig, _) = item.kind {
         // don't lint extern functions decls, it's not their fault
         if sig.header.abi == Abi::Rust {

clippy_lints/src/functions/too_many_lines.rs

@@ -11,9 +11,9 @@ use super::TOO_MANY_LINES;
 
 pub(super) fn check_fn(
     cx: &LateContext<'_>,
-    kind: FnKind<'tcx>,
+    kind: FnKind<'_>,
     span: Span,
-    body: &'tcx hir::Body<'_>,
+    body: &hir::Body<'_>,
     too_many_lines_threshold: u64,
 ) {
     // Closures must be contained in a parent body, which will be checked for `too_many_lines`.

clippy_lints/src/if_then_some_else_none.rs

@@ -55,7 +55,7 @@ impl IfThenSomeElseNone {
 
 impl_lint_pass!(IfThenSomeElseNone => [IF_THEN_SOME_ELSE_NONE]);
 
-impl LateLintPass<'_> for IfThenSomeElseNone {
+impl<'tcx> LateLintPass<'tcx> for IfThenSomeElseNone {
     fn check_expr(&mut self, cx: &LateContext<'_>, expr: &'tcx Expr<'_>) {
         if !meets_msrv(self.msrv.as_ref(), &msrvs::BOOL_THEN) {
             return;

clippy_lints/src/implicit_return.rs

@@ -94,8 +94,8 @@ fn get_call_site(span: Span, ctxt: SyntaxContext) -> Option<Span> {
 }
 
 fn lint_implicit_returns(
-    cx: &LateContext<'tcx>,
+    cx: &LateContext<'_>,
-    expr: &'tcx Expr<'_>,
+    expr: &Expr<'_>,
     // The context of the function body.
     ctxt: SyntaxContext,
     // Whether the expression is from a macro expansion.

clippy_lints/src/inconsistent_struct_constructor.rs

@@ -63,7 +63,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(InconsistentStructConstructor => [INCONSISTENT_STRUCT_CONSTRUCTOR]);
 
-impl LateLintPass<'_> for InconsistentStructConstructor {
+impl<'tcx> LateLintPass<'tcx> for InconsistentStructConstructor {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
         if_chain! {
             if !expr.span.from_expansion();

clippy_lints/src/index_refutable_slice.rs

@@ -69,7 +69,7 @@ impl IndexRefutableSlice {
 
 impl_lint_pass!(IndexRefutableSlice => [INDEX_REFUTABLE_SLICE]);
 
-impl LateLintPass<'_> for IndexRefutableSlice {
+impl<'tcx> LateLintPass<'tcx> for IndexRefutableSlice {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
         if_chain! {
             if !expr.span.from_expansion() || is_expn_of(expr.span, "if_chain").is_some();

clippy_lints/src/iter_not_returning_iterator.rs

@@ -39,7 +39,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(IterNotReturningIterator => [ITER_NOT_RETURNING_ITERATOR]);
 
-impl LateLintPass<'_> for IterNotReturningIterator {
+impl<'tcx> LateLintPass<'tcx> for IterNotReturningIterator {
     fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
         let name = item.ident.name.as_str();
         if matches!(name, "iter" | "iter_mut") {

clippy_lints/src/len_zero.rs

@@ -245,7 +245,7 @@ enum LenOutput<'tcx> {
     Option(DefId),
     Result(DefId, Ty<'tcx>),
 }
-fn parse_len_output(cx: &LateContext<'_>, sig: FnSig<'tcx>) -> Option<LenOutput<'tcx>> {
+fn parse_len_output<'tcx>(cx: &LateContext<'_>, sig: FnSig<'tcx>) -> Option<LenOutput<'tcx>> {
     match *sig.output().kind() {
         ty::Int(_) | ty::Uint(_) => Some(LenOutput::Integral),
         ty::Adt(adt, subs) if cx.tcx.is_diagnostic_item(sym::Option, adt.did) => {

clippy_lints/src/lib.rs

@@ -4,7 +4,6 @@
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
 #![feature(drain_filter)]
-#![feature(in_band_lifetimes)]
 #![feature(iter_intersperse)]
 #![feature(let_else)]
 #![feature(once_cell)]

clippy_lints/src/loops/empty_loop.rs

@@ -5,7 +5,7 @@ use clippy_utils::{is_in_panic_handler, is_no_std_crate};
 use rustc_hir::{Block, Expr};
 use rustc_lint::LateContext;
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, loop_block: &'tcx Block<'_>) {
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, loop_block: &Block<'_>) {
     if loop_block.stmts.is_empty() && loop_block.expr.is_none() && !is_in_panic_handler(cx, expr) {
         let msg = "empty `loop {}` wastes CPU cycles";
         let help = if is_no_std_crate(cx) {

clippy_lints/src/loops/explicit_into_iter_loop.rs

@@ -8,7 +8,7 @@ use rustc_lint::LateContext;
 use rustc_middle::ty::TyS;
 use rustc_span::symbol::sym;
 
-pub(super) fn check(cx: &LateContext<'_>, self_arg: &'hir Expr<'hir>, call_expr: &Expr<'_>) {
+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)) {

clippy_lints/src/loops/manual_memcpy.rs

@@ -203,7 +203,7 @@ fn build_manual_memcpy_suggestion<'tcx>(
 #[derive(Clone)]
 struct MinifyingSugg<'a>(Sugg<'a>);
 
-impl Display for MinifyingSugg<'a> {
+impl<'a> Display for MinifyingSugg<'a> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.0.fmt(f)
     }

clippy_lints/src/loops/mut_range_bound.rs

@@ -147,7 +147,7 @@ impl BreakAfterExprVisitor {
     }
 }
 
-impl intravisit::Visitor<'tcx> for BreakAfterExprVisitor {
+impl<'tcx> intravisit::Visitor<'tcx> for BreakAfterExprVisitor {
     type Map = Map<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

clippy_lints/src/loops/needless_collect.rs

@@ -339,8 +339,8 @@ fn detect_iter_and_into_iters<'tcx: 'a, 'a>(
     }
 }
 
-fn get_captured_ids(cx: &LateContext<'tcx>, ty: &'_ TyS<'_>) -> HirIdSet {
+fn get_captured_ids(cx: &LateContext<'_>, ty: &'_ TyS<'_>) -> HirIdSet {
-    fn get_captured_ids_recursive(cx: &LateContext<'tcx>, ty: &'_ TyS<'_>, set: &mut HirIdSet) {
+    fn get_captured_ids_recursive(cx: &LateContext<'_>, ty: &'_ TyS<'_>, set: &mut HirIdSet) {
         match ty.kind() {
             ty::Adt(_, generics) => {
                 for generic in *generics {

clippy_lints/src/loops/never_loop.rs

@@ -10,8 +10,8 @@ use rustc_span::Span;
 use std::iter::{once, Iterator};
 
 pub(super) fn check(
-    cx: &LateContext<'tcx>,
+    cx: &LateContext<'_>,
-    block: &'tcx Block<'_>,
+    block: &Block<'_>,
     loop_id: HirId,
     span: Span,
     for_loop: Option<&ForLoop<'_>>,

clippy_lints/src/loops/while_let_loop.rs

@@ -7,7 +7,7 @@ use rustc_hir::{Block, Expr, ExprKind, MatchSource, Pat, StmtKind};
 use rustc_lint::{LateContext, LintContext};
 use rustc_middle::lint::in_external_macro;
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, loop_block: &'tcx Block<'_>) {
+pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, loop_block: &'tcx Block<'_>) {
     // extract the expression from the first statement (if any) in a block
     let inner_stmt_expr = extract_expr_from_first_stmt(loop_block);
     // or extract the first expression (if any) from the block

clippy_lints/src/loops/while_let_on_iterator.rs

@@ -13,7 +13,7 @@ use rustc_lint::LateContext;
 use rustc_middle::ty::adjustment::Adjust;
 use rustc_span::{symbol::sym, Symbol};
 
-pub(super) fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
     let (scrutinee_expr, iter_expr_struct, iter_expr, some_pat, loop_expr) = if_chain! {
         if let Some(higher::WhileLet { if_then, let_pat, let_expr }) = higher::WhileLet::hir(expr);
         // check for `Some(..)` pattern
@@ -191,7 +191,7 @@ fn is_expr_same_child_or_parent_field(cx: &LateContext<'_>, expr: &Expr<'_>, fie
 
 /// Strips off all field and path expressions. This will return true if a field or path has been
 /// skipped. Used to skip them after failing to check for equality.
-fn skip_fields_and_path(expr: &'tcx Expr<'_>) -> (Option<&'tcx Expr<'tcx>>, bool) {
+fn skip_fields_and_path<'tcx>(expr: &'tcx Expr<'_>) -> (Option<&'tcx Expr<'tcx>>, bool) {
     let mut e = expr;
     let e = loop {
         match e.kind {
@@ -204,13 +204,13 @@ fn skip_fields_and_path(expr: &'tcx Expr<'_>) -> (Option<&'tcx Expr<'tcx>>, bool
 }
 
 /// Checks if the given expression uses the iterator.
-fn uses_iter(cx: &LateContext<'tcx>, iter_expr: &IterExpr, container: &'tcx Expr<'_>) -> bool {
+fn uses_iter<'tcx>(cx: &LateContext<'tcx>, iter_expr: &IterExpr, container: &'tcx Expr<'_>) -> bool {
     struct V<'a, 'b, 'tcx> {
         cx: &'a LateContext<'tcx>,
         iter_expr: &'b IterExpr,
         uses_iter: bool,
     }
-    impl Visitor<'tcx> for V<'_, '_, 'tcx> {
+    impl<'tcx> Visitor<'tcx> for V<'_, '_, 'tcx> {
         type Map = ErasedMap<'tcx>;
         fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
             NestedVisitorMap::None
@@ -245,7 +245,7 @@ fn uses_iter(cx: &LateContext<'tcx>, iter_expr: &IterExpr, container: &'tcx Expr
 }
 
 #[allow(clippy::too_many_lines)]
-fn needs_mutable_borrow(cx: &LateContext<'tcx>, iter_expr: &IterExpr, loop_expr: &'tcx Expr<'_>) -> bool {
+fn needs_mutable_borrow(cx: &LateContext<'_>, iter_expr: &IterExpr, loop_expr: &Expr<'_>) -> bool {
     struct AfterLoopVisitor<'a, 'b, 'tcx> {
         cx: &'a LateContext<'tcx>,
         iter_expr: &'b IterExpr,
@@ -253,7 +253,7 @@ fn needs_mutable_borrow(cx: &LateContext<'tcx>, iter_expr: &IterExpr, loop_expr:
         after_loop: bool,
         used_iter: bool,
     }
-    impl Visitor<'tcx> for AfterLoopVisitor<'_, '_, 'tcx> {
+    impl<'tcx> Visitor<'tcx> for AfterLoopVisitor<'_, '_, 'tcx> {
         type Map = ErasedMap<'tcx>;
         fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
             NestedVisitorMap::None
@@ -292,7 +292,7 @@ fn needs_mutable_borrow(cx: &LateContext<'tcx>, iter_expr: &IterExpr, loop_expr:
         found_local: bool,
         used_after: bool,
     }
-    impl Visitor<'tcx> for NestedLoopVisitor<'a, 'b, 'tcx> {
+    impl<'a, 'b, 'tcx> Visitor<'tcx> for NestedLoopVisitor<'a, 'b, 'tcx> {
         type Map = ErasedMap<'tcx>;
 
         fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

clippy_lints/src/manual_assert.rs

@@ -35,7 +35,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(ManualAssert => [MANUAL_ASSERT]);
 
-impl LateLintPass<'_> for ManualAssert {
+impl<'tcx> LateLintPass<'tcx> for ManualAssert {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
         if_chain! {
             if let ExprKind::If(cond, then, None) = expr.kind;

clippy_lints/src/manual_map.rs

@@ -45,7 +45,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(ManualMap => [MANUAL_MAP]);
 
-impl LateLintPass<'_> for ManualMap {
+impl<'tcx> LateLintPass<'tcx> for ManualMap {
     #[allow(clippy::too_many_lines)]
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         let (scrutinee, then_pat, then_body, else_pat, else_body) = match IfLetOrMatch::parse(cx, expr) {
@@ -219,7 +219,7 @@ impl LateLintPass<'_> for ManualMap {
 
 // Checks whether the expression could be passed as a function, or whether a closure is needed.
 // Returns the function to be passed to `map` if it exists.
-fn can_pass_as_func(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+fn can_pass_as_func<'tcx>(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
     match expr.kind {
         ExprKind::Call(func, [arg])
             if path_to_local_id(arg, binding)
@@ -251,8 +251,13 @@ struct SomeExpr<'tcx> {
 
 // Try to parse into a recognized `Option` pattern.
 // i.e. `_`, `None`, `Some(..)`, or a reference to any of those.
-fn try_parse_pattern(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
+fn try_parse_pattern<'tcx>(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
-    fn f(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ref_count: usize, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
+    fn f<'tcx>(
+        cx: &LateContext<'tcx>,
+        pat: &'tcx Pat<'_>,
+        ref_count: usize,
+        ctxt: SyntaxContext,
+    ) -> Option<OptionPat<'tcx>> {
         match pat.kind {
             PatKind::Wild => Some(OptionPat::Wild),
             PatKind::Ref(pat, _) => f(cx, pat, ref_count + 1, ctxt),
@@ -269,7 +274,7 @@ fn try_parse_pattern(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ctxt: SyntaxCon
 }
 
 // Checks for an expression wrapped by the `Some` constructor. Returns the contained expression.
-fn get_some_expr(
+fn get_some_expr<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &'tcx Expr<'_>,
     needs_unsafe_block: bool,
@@ -306,6 +311,6 @@ fn get_some_expr(
 }
 
 // Checks for the `None` value.
-fn is_none_expr(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+fn is_none_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     matches!(peel_blocks(expr).kind, ExprKind::Path(ref qpath) if is_lang_ctor(cx, qpath, OptionNone))
 }

clippy_lints/src/manual_ok_or.rs

@@ -40,7 +40,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(ManualOkOr => [MANUAL_OK_OR]);
 
-impl LateLintPass<'_> for ManualOkOr {
+impl<'tcx> LateLintPass<'tcx> for ManualOkOr {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, scrutinee: &'tcx Expr<'tcx>) {
         if in_external_macro(cx.sess(), scrutinee.span) {
             return;

clippy_lints/src/manual_unwrap_or.rs

@@ -43,7 +43,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(ManualUnwrapOr => [MANUAL_UNWRAP_OR]);
 
-impl LateLintPass<'_> for ManualUnwrapOr {
+impl<'tcx> LateLintPass<'tcx> for ManualUnwrapOr {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         if in_external_macro(cx.sess(), expr.span) || in_constant(cx, expr.hir_id) {
             return;

clippy_lints/src/match_str_case_mismatch.rs

@@ -55,7 +55,7 @@ enum CaseMethod {
     AsciiUppercase,
 }
 
-impl LateLintPass<'_> for MatchStrCaseMismatch {
+impl<'tcx> LateLintPass<'tcx> for MatchStrCaseMismatch {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if_chain! {
             if !in_external_macro(cx.tcx.sess, expr.span);

clippy_lints/src/matches.rs

@@ -999,7 +999,7 @@ enum CommonPrefixSearcher<'a> {
     Path(&'a [PathSegment<'a>]),
     Mixed,
 }
-impl CommonPrefixSearcher<'a> {
+impl<'a> CommonPrefixSearcher<'a> {
     fn with_path(&mut self, path: &'a [PathSegment<'a>]) {
         match path {
             [path @ .., _] => self.with_prefix(path),
@@ -1804,11 +1804,15 @@ mod redundant_pattern_match {
     /// Checks if the drop order for a type matters. Some std types implement drop solely to
     /// deallocate memory. For these types, and composites containing them, changing the drop order
     /// won't result in any observable side effects.
-    fn type_needs_ordered_drop(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+    fn type_needs_ordered_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
         type_needs_ordered_drop_inner(cx, ty, &mut FxHashSet::default())
     }
 
-    fn type_needs_ordered_drop_inner(cx: &LateContext<'tcx>, ty: Ty<'tcx>, seen: &mut FxHashSet<Ty<'tcx>>) -> bool {
+    fn type_needs_ordered_drop_inner<'tcx>(
+        cx: &LateContext<'tcx>,
+        ty: Ty<'tcx>,
+        seen: &mut FxHashSet<Ty<'tcx>>,
+    ) -> bool {
         if !seen.insert(ty) {
             return false;
         }
@@ -1870,7 +1874,7 @@ mod redundant_pattern_match {
 
     // Checks if there are any temporaries created in the given expression for which drop order
     // matters.
-    fn temporaries_need_ordered_drop(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
+    fn temporaries_need_ordered_drop<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
         struct V<'a, 'tcx> {
             cx: &'a LateContext<'tcx>,
             res: bool,

clippy_lints/src/methods/expect_fun_call.rs

@@ -14,7 +14,7 @@ use super::EXPECT_FUN_CALL;
 
 /// Checks for the `EXPECT_FUN_CALL` lint.
 #[allow(clippy::too_many_lines)]
-pub(super) fn check(
+pub(super) fn check<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &hir::Expr<'_>,
     method_span: Span,

clippy_lints/src/methods/from_iter_instead_of_collect.rs

@@ -37,7 +37,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, args: &[hir::Exp
     }
 }
 
-fn extract_turbofish(cx: &LateContext<'_>, expr: &hir::Expr<'_>, ty: Ty<'tcx>) -> String {
+fn extract_turbofish(cx: &LateContext<'_>, expr: &hir::Expr<'_>, ty: Ty<'_>) -> String {
     fn strip_angle_brackets(s: &str) -> Option<&str> {
         s.strip_prefix('<')?.strip_suffix('>')
     }

clippy_lints/src/methods/str_splitn.rs

@@ -124,7 +124,7 @@ struct IterUsage {
 }
 
 #[allow(clippy::too_many_lines)]
-fn parse_iter_usage(
+fn parse_iter_usage<'tcx>(
     cx: &LateContext<'tcx>,
     ctxt: SyntaxContext,
     mut iter: impl Iterator<Item = (HirId, Node<'tcx>)>,
@@ -281,7 +281,7 @@ pub(super) fn check_needless_splitn(
     }
 }
 
-fn check_iter(
+fn check_iter<'tcx>(
     cx: &LateContext<'tcx>,
     ctxt: SyntaxContext,
     mut iter: impl Iterator<Item = (HirId, Node<'tcx>)>,

clippy_lints/src/methods/unnecessary_iter_cloned.rs

@@ -12,7 +12,7 @@ use rustc_span::{sym, Symbol};
 
 use super::UNNECESSARY_TO_OWNED;
 
-pub fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, method_name: Symbol, receiver: &'tcx Expr<'tcx>) -> bool {
+pub fn check(cx: &LateContext<'_>, expr: &Expr<'_>, method_name: Symbol, receiver: &Expr<'_>) -> bool {
     if_chain! {
         if let Some(parent) = get_parent_expr(cx, expr);
         if let Some(callee_def_id) = fn_def_id(cx, parent);
@@ -30,10 +30,10 @@ pub fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, method_name: Symbol
 /// include this code directly is so that it can be called from
 /// `unnecessary_into_owned::check_into_iter_call_arg`.
 pub fn check_for_loop_iter(
-    cx: &LateContext<'tcx>,
+    cx: &LateContext<'_>,
-    expr: &'tcx Expr<'tcx>,
+    expr: &Expr<'_>,
     method_name: Symbol,
-    receiver: &'tcx Expr<'tcx>,
+    receiver: &Expr<'_>,
     cloned_before_iter: bool,
 ) -> bool {
     if_chain! {
@@ -101,7 +101,7 @@ pub fn check_for_loop_iter(
 
 /// The core logic of `check_for_loop_iter` above, this function wraps a use of
 /// `CloneOrCopyVisitor`.
-fn clone_or_copy_needed(
+fn clone_or_copy_needed<'tcx>(
     cx: &LateContext<'tcx>,
     pat: &Pat<'tcx>,
     body: &'tcx Expr<'tcx>,

clippy_lints/src/methods/unnecessary_to_owned.rs

@@ -16,7 +16,7 @@ use std::cmp::max;
 
 use super::UNNECESSARY_TO_OWNED;
 
-pub fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, method_name: Symbol, args: &'tcx [Expr<'tcx>]) {
+pub fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, method_name: Symbol, args: &'tcx [Expr<'tcx>]) {
     if_chain! {
         if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
         if let [receiver] = args;
@@ -44,11 +44,11 @@ pub fn check(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, method_name: Symbol
 /// call of a `to_owned`-like function is unnecessary.
 #[allow(clippy::too_many_lines)]
 fn check_addr_of_expr(
-    cx: &LateContext<'tcx>,
+    cx: &LateContext<'_>,
-    expr: &'tcx Expr<'tcx>,
+    expr: &Expr<'_>,
     method_name: Symbol,
     method_def_id: DefId,
-    receiver: &'tcx Expr<'tcx>,
+    receiver: &Expr<'_>,
 ) -> bool {
     if_chain! {
         if let Some(parent) = get_parent_expr(cx, expr);
@@ -171,12 +171,7 @@ fn check_addr_of_expr(
 
 /// Checks whether `expr` is an argument in an `into_iter` call and, if so, determines whether its
 /// call of a `to_owned`-like function is unnecessary.
-fn check_into_iter_call_arg(
+fn check_into_iter_call_arg(cx: &LateContext<'_>, expr: &Expr<'_>, method_name: Symbol, receiver: &Expr<'_>) -> bool {
-    cx: &LateContext<'tcx>,
-    expr: &'tcx Expr<'tcx>,
-    method_name: Symbol,
-    receiver: &'tcx Expr<'tcx>,
-) -> bool {
     if_chain! {
         if let Some(parent) = get_parent_expr(cx, expr);
         if let Some(callee_def_id) = fn_def_id(cx, parent);
@@ -221,7 +216,7 @@ fn check_into_iter_call_arg(
 
 /// Checks whether `expr` is an argument in a function call and, if so, determines whether its call
 /// of a `to_owned`-like function is unnecessary.
-fn check_other_call_arg(
+fn check_other_call_arg<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &'tcx Expr<'tcx>,
     method_name: Symbol,
@@ -287,7 +282,7 @@ fn check_other_call_arg(
 
 /// Walks an expression's ancestors until it finds a non-`AddrOf` expression. Returns the first such
 /// expression found (if any) along with the immediately prior expression.
-fn skip_addr_of_ancestors(
+fn skip_addr_of_ancestors<'tcx>(
     cx: &LateContext<'tcx>,
     mut expr: &'tcx Expr<'tcx>,
 ) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> {
@@ -303,7 +298,7 @@ fn skip_addr_of_ancestors(
 
 /// Checks whether an expression is a function or method call and, if so, returns its `DefId`,
 /// `Substs`, and arguments.
-fn get_callee_substs_and_args(
+fn get_callee_substs_and_args<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &'tcx Expr<'tcx>,
 ) -> Option<(DefId, SubstsRef<'tcx>, &'tcx [Expr<'tcx>])> {
@@ -328,7 +323,7 @@ fn get_callee_substs_and_args(
 }
 
 /// Returns the `TraitPredicate`s and `ProjectionPredicate`s for a function's input type.
-fn get_input_traits_and_projections(
+fn get_input_traits_and_projections<'tcx>(
     cx: &LateContext<'tcx>,
     callee_def_id: DefId,
     input: Ty<'tcx>,
@@ -368,7 +363,11 @@ fn get_input_traits_and_projections(
 }
 
 /// Composes two substitutions by applying the latter to the types of the former.
-fn compose_substs(cx: &LateContext<'tcx>, left: &[GenericArg<'tcx>], right: SubstsRef<'tcx>) -> Vec<GenericArg<'tcx>> {
+fn compose_substs<'tcx>(
+    cx: &LateContext<'tcx>,
+    left: &[GenericArg<'tcx>],
+    right: SubstsRef<'tcx>,
+) -> Vec<GenericArg<'tcx>> {
     left.iter()
         .map(|arg| {
             if let GenericArgKind::Type(arg_ty) = arg.unpack() {

clippy_lints/src/misc.rs

@@ -717,7 +717,7 @@ fn check_cast(cx: &LateContext<'_>, span: Span, e: &Expr<'_>, ty: &hir::Ty<'_>)
     }
 }
 
-fn check_binary(
+fn check_binary<'a>(
     cx: &LateContext<'a>,
     expr: &Expr<'_>,
     cmp: &rustc_span::source_map::Spanned<rustc_hir::BinOpKind>,

clippy_lints/src/needless_for_each.rs

@@ -48,7 +48,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(NeedlessForEach => [NEEDLESS_FOR_EACH]);
 
-impl LateLintPass<'_> for NeedlessForEach {
+impl<'tcx> LateLintPass<'tcx> for NeedlessForEach {
     fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
         let expr = match stmt.kind {
             StmtKind::Expr(expr) | StmtKind::Semi(expr) => expr,

clippy_lints/src/needless_late_init.rs

@@ -330,7 +330,7 @@ fn check<'tcx>(
     Some(())
 }
 
-impl LateLintPass<'tcx> for NeedlessLateInit {
+impl<'tcx> LateLintPass<'tcx> for NeedlessLateInit {
     fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx Local<'tcx>) {
         let mut parents = cx.tcx.hir().parent_iter(local.hir_id);
 

clippy_lints/src/no_effect.rs

@@ -82,7 +82,7 @@ impl<'tcx> LateLintPass<'tcx> for NoEffect {
     }
 }
 
-fn check_no_effect(cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) -> bool {
+fn check_no_effect(cx: &LateContext<'_>, stmt: &Stmt<'_>) -> bool {
     if let StmtKind::Semi(expr) = stmt.kind {
         if has_no_effect(cx, expr) {
             span_lint_hir(cx, NO_EFFECT, expr.hir_id, stmt.span, "statement with no effect");
@@ -155,7 +155,7 @@ fn has_no_effect(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     }
 }
 
-fn check_unnecessary_operation(cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
+fn check_unnecessary_operation(cx: &LateContext<'_>, stmt: &Stmt<'_>) {
     if_chain! {
         if let StmtKind::Semi(expr) = stmt.kind;
         if let Some(reduced) = reduce_expression(cx, expr);

clippy_lints/src/non_octal_unix_permissions.rs

@@ -40,7 +40,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(NonOctalUnixPermissions => [NON_OCTAL_UNIX_PERMISSIONS]);
 
-impl LateLintPass<'_> for NonOctalUnixPermissions {
+impl<'tcx> LateLintPass<'tcx> for NonOctalUnixPermissions {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         match &expr.kind {
             ExprKind::MethodCall(path, _, [func, param], _) => {

clippy_lints/src/octal_escapes.rs

@@ -50,7 +50,7 @@ declare_clippy_lint! {
 declare_lint_pass!(OctalEscapes => [OCTAL_ESCAPES]);
 
 impl EarlyLintPass for OctalEscapes {
-    fn check_expr(&mut self, cx: &EarlyContext<'tcx>, expr: &Expr) {
+    fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
         if in_external_macro(cx.sess, expr.span) {
             return;
         }
@@ -65,7 +65,7 @@ impl EarlyLintPass for OctalEscapes {
     }
 }
 
-fn check_lit(cx: &EarlyContext<'tcx>, lit: &Lit, span: Span, is_string: bool) {
+fn check_lit(cx: &EarlyContext<'_>, lit: &Lit, span: Span, is_string: bool) {
     let contents = lit.symbol.as_str();
     let mut iter = contents.char_indices().peekable();
     let mut found = vec![];

clippy_lints/src/ptr_eq.rs

@@ -39,7 +39,7 @@ declare_lint_pass!(PtrEq => [PTR_EQ]);
 
 static LINT_MSG: &str = "use `std::ptr::eq` when comparing raw pointers";
 
-impl LateLintPass<'_> for PtrEq {
+impl<'tcx> LateLintPass<'tcx> for PtrEq {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if expr.span.from_expansion() {
             return;

clippy_lints/src/redundant_slicing.rs

@@ -42,7 +42,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(RedundantSlicing => [REDUNDANT_SLICING]);
 
-impl LateLintPass<'_> for RedundantSlicing {
+impl<'tcx> LateLintPass<'tcx> for RedundantSlicing {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if expr.span.from_expansion() {
             return;

clippy_lints/src/return_self_not_must_use.rs

@@ -66,7 +66,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(ReturnSelfNotMustUse => [RETURN_SELF_NOT_MUST_USE]);
 
-fn check_method(cx: &LateContext<'tcx>, decl: &'tcx FnDecl<'tcx>, fn_def: LocalDefId, span: Span, hir_id: HirId) {
+fn check_method(cx: &LateContext<'_>, decl: &FnDecl<'_>, fn_def: LocalDefId, span: Span, hir_id: HirId) {
     if_chain! {
         // If it comes from an external macro, better ignore it.
         if !in_external_macro(cx.sess(), span);

clippy_lints/src/semicolon_if_nothing_returned.rs

@@ -37,7 +37,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(SemicolonIfNothingReturned => [SEMICOLON_IF_NOTHING_RETURNED]);
 
-impl LateLintPass<'_> for SemicolonIfNothingReturned {
+impl<'tcx> LateLintPass<'tcx> for SemicolonIfNothingReturned {
     fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) {
         if_chain! {
             if !block.span.from_expansion();

clippy_lints/src/size_of_in_element_count.rs

@@ -37,7 +37,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(SizeOfInElementCount => [SIZE_OF_IN_ELEMENT_COUNT]);
 
-fn get_size_of_ty(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, inverted: bool) -> Option<Ty<'tcx>> {
+fn get_size_of_ty<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, inverted: bool) -> Option<Ty<'tcx>> {
     match expr.kind {
         ExprKind::Call(count_func, _func_args) => {
             if_chain! {
@@ -64,7 +64,10 @@ fn get_size_of_ty(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, inverted: bool)
     }
 }
 
-fn get_pointee_ty_and_count_expr(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<(Ty<'tcx>, &'tcx Expr<'tcx>)> {
+fn get_pointee_ty_and_count_expr<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &'tcx Expr<'_>,
+) -> Option<(Ty<'tcx>, &'tcx Expr<'tcx>)> {
     const FUNCTIONS: [&[&str]; 8] = [
         &paths::PTR_COPY_NONOVERLAPPING,
         &paths::PTR_COPY,

clippy_lints/src/strings.rs

@@ -381,7 +381,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(StrToString => [STR_TO_STRING]);
 
-impl LateLintPass<'_> for StrToString {
+impl<'tcx> LateLintPass<'tcx> for StrToString {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
         if_chain! {
             if let ExprKind::MethodCall(path, _, [self_arg, ..], _) = &expr.kind;
@@ -431,7 +431,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(StringToString => [STRING_TO_STRING]);
 
-impl LateLintPass<'_> for StringToString {
+impl<'tcx> LateLintPass<'tcx> for StringToString {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
         if_chain! {
             if let ExprKind::MethodCall(path, _, [self_arg, ..], _) = &expr.kind;

clippy_lints/src/strlen_on_c_strings.rs

@@ -39,7 +39,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(StrlenOnCStrings => [STRLEN_ON_C_STRINGS]);
 
-impl LateLintPass<'tcx> for StrlenOnCStrings {
+impl<'tcx> LateLintPass<'tcx> for StrlenOnCStrings {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if_chain! {
             if !expr.span.from_expansion();

clippy_lints/src/suspicious_operation_groupings.rs

@@ -355,7 +355,7 @@ struct BinaryOp<'exprs> {
     right: &'exprs Expr,
 }
 
-impl BinaryOp<'exprs> {
+impl<'exprs> BinaryOp<'exprs> {
     fn new(op: BinOpKind, span: Span, (left, right): (&'exprs Expr, &'exprs Expr)) -> Self {
         Self { op, span, left, right }
     }
@@ -419,7 +419,7 @@ fn chained_binops(kind: &ExprKind) -> Option<Vec<BinaryOp<'_>>> {
     }
 }
 
-fn chained_binops_helper(left_outer: &'expr Expr, right_outer: &'expr Expr) -> Option<Vec<BinaryOp<'expr>>> {
+fn chained_binops_helper<'expr>(left_outer: &'expr Expr, right_outer: &'expr Expr) -> Option<Vec<BinaryOp<'expr>>> {
     match (&left_outer.kind, &right_outer.kind) {
         (
             ExprKind::Paren(ref left_e) | ExprKind::Unary(_, ref left_e),

clippy_lints/src/trailing_empty_array.rs

@@ -53,7 +53,7 @@ impl<'tcx> LateLintPass<'tcx> for TrailingEmptyArray {
     }
 }
 
-fn is_struct_with_trailing_zero_sized_array(cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) -> bool {
+fn is_struct_with_trailing_zero_sized_array(cx: &LateContext<'_>, item: &Item<'_>) -> bool {
     if_chain! {
         // First check if last field is an array
         if let ItemKind::Struct(data, _) = &item.kind;

clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -113,8 +113,8 @@ impl LateLintPass<'_> for UndocumentedUnsafeBlocks {
     }
 }
 
-impl<'hir> Visitor<'hir> for UndocumentedUnsafeBlocks {
+impl<'v> Visitor<'v> for UndocumentedUnsafeBlocks {
-    type Map = Map<'hir>;
+    type Map = Map<'v>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
         NestedVisitorMap::None

clippy_lints/src/undropped_manually_drops.rs

@@ -36,7 +36,7 @@ declare_clippy_lint! {
 
 declare_lint_pass!(UndroppedManuallyDrops => [UNDROPPED_MANUALLY_DROPS]);
 
-impl LateLintPass<'tcx> for UndroppedManuallyDrops {
+impl<'tcx> LateLintPass<'tcx> for UndroppedManuallyDrops {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if let Some([arg_0, ..]) = match_function_call(cx, expr, &paths::DROP) {
             let ty = cx.typeck_results().expr_ty(arg_0);

clippy_lints/src/uninit_vec.rs

@@ -78,7 +78,7 @@ impl<'tcx> LateLintPass<'tcx> for UninitVec {
     }
 }
 
-fn handle_uninit_vec_pair(
+fn handle_uninit_vec_pair<'tcx>(
     cx: &LateContext<'tcx>,
     maybe_init_or_reserve: &'tcx Stmt<'tcx>,
     maybe_set_len: &'tcx Expr<'tcx>,
@@ -196,7 +196,7 @@ fn is_reserve(cx: &LateContext<'_>, path: &PathSegment<'_>, self_expr: &Expr<'_>
 }
 
 /// Returns self if the expression is `Vec::set_len()`
-fn extract_set_len_self(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Option<(&'tcx Expr<'tcx>, Span)> {
+fn extract_set_len_self<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Option<(&'tcx Expr<'tcx>, Span)> {
     // peel unsafe blocks in `unsafe { vec.set_len() }`
     let expr = peel_hir_expr_while(expr, |e| {
         if let ExprKind::Block(block, _) = e.kind {

clippy_lints/src/unit_hash.rs

@@ -46,7 +46,7 @@ declare_clippy_lint! {
 }
 declare_lint_pass!(UnitHash => [UNIT_HASH]);
 
-impl LateLintPass<'tcx> for UnitHash {
+impl<'tcx> LateLintPass<'tcx> for UnitHash {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         if_chain! {
             if let ExprKind::MethodCall(name_ident, _, args, _) = &expr.kind;

clippy_lints/src/utils/internal_lints/metadata_collector.rs

@@ -577,7 +577,7 @@ fn get_lint_version(cx: &LateContext<'_>, item: &Item<'_>) -> String {
 fn get_lint_group_and_level_or_lint(
     cx: &LateContext<'_>,
     lint_name: &str,
-    item: &'hir Item<'_>,
+    item: &Item<'_>,
 ) -> Option<(String, &'static str)> {
     let result = cx
         .lint_store
@@ -696,20 +696,20 @@ fn extract_emission_info<'hir>(
 }
 
 /// Resolves the possible lints that this expression could reference
-fn resolve_lints(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Vec<String> {
+fn resolve_lints<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Vec<String> {
     let mut resolver = LintResolver::new(cx);
     resolver.visit_expr(expr);
     resolver.lints
 }
 
 /// This function tries to resolve the linked applicability to the given expression.
-fn resolve_applicability(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<usize> {
+fn resolve_applicability<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<usize> {
     let mut resolver = ApplicabilityResolver::new(cx);
     resolver.visit_expr(expr);
     resolver.complete()
 }
 
-fn check_is_multi_part(cx: &LateContext<'hir>, closure_expr: &'hir hir::Expr<'hir>) -> bool {
+fn check_is_multi_part<'hir>(cx: &LateContext<'hir>, closure_expr: &'hir hir::Expr<'hir>) -> bool {
     if let ExprKind::Closure(_, _, body_id, _, _) = closure_expr.kind {
         let mut scanner = IsMultiSpanScanner::new(cx);
         intravisit::walk_body(&mut scanner, cx.tcx.hir().body(body_id));
@@ -824,7 +824,7 @@ impl<'a, 'hir> intravisit::Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
 }
 
 /// This returns the parent local node if the expression is a reference one
-fn get_parent_local(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<&'hir hir::Local<'hir>> {
+fn get_parent_local<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<&'hir hir::Local<'hir>> {
     if let ExprKind::Path(QPath::Resolved(_, path)) = expr.kind {
         if let hir::def::Res::Local(local_hir) = path.res {
             return get_parent_local_hir_id(cx, local_hir);
@@ -834,7 +834,7 @@ fn get_parent_local(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Opti
     None
 }
 
-fn get_parent_local_hir_id(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
+fn get_parent_local_hir_id<'hir>(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
     let map = cx.tcx.hir();
 
     match map.find(map.get_parent_node(hir_id)) {

clippy_lints/src/vec_init_then_push.rs

@@ -77,7 +77,7 @@ impl VecPushSearcher {
     }
 }
 
-impl LateLintPass<'_> for VecInitThenPush {
+impl<'tcx> LateLintPass<'tcx> for VecInitThenPush {
     fn check_block(&mut self, _: &LateContext<'tcx>, _: &'tcx Block<'tcx>) {
         self.searcher = None;
     }

clippy_utils/src/consts.rs

@@ -223,7 +223,7 @@ pub fn constant_simple<'tcx>(
     constant(lcx, typeck_results, e).and_then(|(cst, res)| if res { None } else { Some(cst) })
 }
 
-pub fn constant_full_int(
+pub fn constant_full_int<'tcx>(
     lcx: &LateContext<'tcx>,
     typeck_results: &ty::TypeckResults<'tcx>,
     e: &Expr<'_>,

clippy_utils/src/eager_or_lazy.rs

@@ -45,7 +45,12 @@ impl ops::BitOrAssign for EagernessSuggestion {
 }
 
 /// Determine the eagerness of the given function call.
-fn fn_eagerness(cx: &LateContext<'tcx>, fn_id: DefId, name: Symbol, args: &'tcx [Expr<'_>]) -> EagernessSuggestion {
+fn fn_eagerness<'tcx>(
+    cx: &LateContext<'tcx>,
+    fn_id: DefId,
+    name: Symbol,
+    args: &'tcx [Expr<'_>],
+) -> EagernessSuggestion {
     use EagernessSuggestion::{Eager, Lazy, NoChange};
     let name = name.as_str();
 
@@ -92,7 +97,7 @@ fn fn_eagerness(cx: &LateContext<'tcx>, fn_id: DefId, name: Symbol, args: &'tcx
 }
 
 #[allow(clippy::too_many_lines)]
-fn expr_eagerness(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> EagernessSuggestion {
+fn expr_eagerness<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> EagernessSuggestion {
     struct V<'cx, 'tcx> {
         cx: &'cx LateContext<'tcx>,
         eagerness: EagernessSuggestion,
@@ -225,11 +230,11 @@ fn expr_eagerness(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> EagernessSuggest
 }
 
 /// Whether the given expression should be changed to evaluate eagerly
-pub fn switch_to_eager_eval(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+pub fn switch_to_eager_eval<'tcx>(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
     expr_eagerness(cx, expr) == EagernessSuggestion::Eager
 }
 
 /// Whether the given expression should be changed to evaluate lazily
-pub fn switch_to_lazy_eval(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+pub fn switch_to_lazy_eval<'tcx>(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
     expr_eagerness(cx, expr) == EagernessSuggestion::Lazy
 }

clippy_utils/src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
-#![feature(in_band_lifetimes)]
 #![feature(let_else)]
 #![feature(once_cell)]
 #![feature(rustc_private)]
@@ -128,7 +127,7 @@ macro_rules! extract_msrv_attr {
         extract_msrv_attr!(@EarlyContext);
     };
     (@$context:ident$(, $call:tt)?) => {
-        fn enter_lint_attrs(&mut self, cx: &rustc_lint::$context<'tcx>, attrs: &'tcx [rustc_ast::ast::Attribute]) {
+        fn enter_lint_attrs(&mut self, cx: &rustc_lint::$context<'_>, attrs: &[rustc_ast::ast::Attribute]) {
             use $crate::get_unique_inner_attr;
             match get_unique_inner_attr(cx.sess$($call)?, attrs, "msrv") {
                 Some(msrv_attr) => {
@@ -277,7 +276,11 @@ pub fn is_wild(pat: &Pat<'_>) -> bool {
 }
 
 /// Checks if the first type parameter is a lang item.
-pub fn is_ty_param_lang_item(cx: &LateContext<'_>, qpath: &QPath<'tcx>, item: LangItem) -> Option<&'tcx hir::Ty<'tcx>> {
+pub fn is_ty_param_lang_item<'tcx>(
+    cx: &LateContext<'_>,
+    qpath: &QPath<'tcx>,
+    item: LangItem,
+) -> Option<&'tcx hir::Ty<'tcx>> {
     let ty = get_qpath_generic_tys(qpath).next()?;
 
     if let TyKind::Path(qpath) = &ty.kind {
@@ -293,7 +296,7 @@ pub fn is_ty_param_lang_item(cx: &LateContext<'_>, qpath: &QPath<'tcx>, item: La
 }
 
 /// Checks if the first type parameter is a diagnostic item.
-pub fn is_ty_param_diagnostic_item(
+pub fn is_ty_param_diagnostic_item<'tcx>(
     cx: &LateContext<'_>,
     qpath: &QPath<'tcx>,
     item: Symbol,
@@ -370,7 +373,7 @@ pub fn last_path_segment<'tcx>(path: &QPath<'tcx>) -> &'tcx PathSegment<'tcx> {
     }
 }
 
-pub fn get_qpath_generics(path: &QPath<'tcx>) -> Option<&'tcx GenericArgs<'tcx>> {
+pub fn get_qpath_generics<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx GenericArgs<'tcx>> {
     match path {
         QPath::Resolved(_, p) => p.segments.last().and_then(|s| s.args),
         QPath::TypeRelative(_, s) => s.args,
@@ -378,7 +381,7 @@ pub fn get_qpath_generics(path: &QPath<'tcx>) -> Option<&'tcx GenericArgs<'tcx>>
     }
 }
 
-pub fn get_qpath_generic_tys(path: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
+pub fn get_qpath_generic_tys<'tcx>(path: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
     get_qpath_generics(path)
         .map_or([].as_ref(), |a| a.args)
         .iter()
@@ -767,7 +770,7 @@ pub fn is_default_equivalent(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
 ///
 /// Note that this check is not recursive, so passing the `if` expression will always return true
 /// even though sub-expressions might return false.
-pub fn can_move_expr_to_closure_no_visit(
+pub fn can_move_expr_to_closure_no_visit<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &'tcx Expr<'_>,
     loop_ids: &[HirId],
@@ -842,7 +845,7 @@ impl std::ops::BitOrAssign for CaptureKind {
 /// Note as this will walk up to parent expressions until the capture can be determined it should
 /// only be used while making a closure somewhere a value is consumed. e.g. a block, match arm, or
 /// function argument (other than a receiver).
-pub fn capture_local_usage(cx: &LateContext<'tcx>, e: &Expr<'_>) -> CaptureKind {
+pub fn capture_local_usage<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> CaptureKind {
     fn pat_capture_kind(cx: &LateContext<'_>, pat: &Pat<'_>) -> CaptureKind {
         let mut capture = CaptureKind::Ref(Mutability::Not);
         pat.each_binding_or_first(&mut |_, id, span, _| match cx
@@ -942,7 +945,7 @@ pub fn capture_local_usage(cx: &LateContext<'tcx>, e: &Expr<'_>) -> CaptureKind
 
 /// Checks if the expression can be moved into a closure as is. This will return a list of captures
 /// if so, otherwise, `None`.
-pub fn can_move_expr_to_closure(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<HirIdMap<CaptureKind>> {
+pub fn can_move_expr_to_closure<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<HirIdMap<CaptureKind>> {
     struct V<'cx, 'tcx> {
         cx: &'cx LateContext<'tcx>,
         // Stack of potential break targets contained in the expression.
@@ -955,7 +958,7 @@ pub fn can_move_expr_to_closure(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) ->
         /// mutable reference.
         captures: HirIdMap<CaptureKind>,
     }
-    impl Visitor<'tcx> for V<'_, 'tcx> {
+    impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
         type Map = ErasedMap<'tcx>;
         fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
             NestedVisitorMap::None
@@ -1212,7 +1215,7 @@ pub fn get_enclosing_block<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Optio
 }
 
 /// Gets the loop or closure enclosing the given expression, if any.
-pub fn get_enclosing_loop_or_closure(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+pub fn get_enclosing_loop_or_closure<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
     for (_, node) in tcx.hir().parent_iter(expr.hir_id) {
         match node {
             Node::Expr(
@@ -1720,7 +1723,7 @@ pub fn is_async_fn(kind: FnKind<'_>) -> bool {
 }
 
 /// Peels away all the compiler generated code surrounding the body of an async function,
-pub fn get_async_fn_body(tcx: TyCtxt<'tcx>, body: &Body<'_>) -> Option<&'tcx Expr<'tcx>> {
+pub fn get_async_fn_body<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'_>) -> Option<&'tcx Expr<'tcx>> {
     if let ExprKind::Call(
         _,
         &[
@@ -1824,7 +1827,7 @@ pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool
 }
 
 /// Gets the node where an expression is either used, or it's type is unified with another branch.
-pub fn get_expr_use_or_unification_node(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<Node<'tcx>> {
+pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<Node<'tcx>> {
     let mut child_id = expr.hir_id;
     let mut iter = tcx.hir().parent_iter(child_id);
     loop {
@@ -2030,8 +2033,8 @@ where
 
 /// Peels off all references on the pattern. Returns the underlying pattern and the number of
 /// references removed.
-pub fn peel_hir_pat_refs(pat: &'a Pat<'a>) -> (&'a Pat<'a>, usize) {
+pub fn peel_hir_pat_refs<'a>(pat: &'a Pat<'a>) -> (&'a Pat<'a>, usize) {
-    fn peel(pat: &'a Pat<'a>, count: usize) -> (&'a Pat<'a>, usize) {
+    fn peel<'a>(pat: &'a Pat<'a>, count: usize) -> (&'a Pat<'a>, usize) {
         if let PatKind::Ref(pat, _) = pat.kind {
             peel(pat, count + 1)
         } else {
@@ -2054,7 +2057,7 @@ pub fn peel_hir_expr_while<'tcx>(
 
 /// Peels off up to the given number of references on the expression. Returns the underlying
 /// expression and the number of references removed.
-pub fn peel_n_hir_expr_refs(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'a>, usize) {
+pub fn peel_n_hir_expr_refs<'a>(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'a>, usize) {
     let mut remaining = count;
     let e = peel_hir_expr_while(expr, |e| match e.kind {
         ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) if remaining != 0 => {
@@ -2068,7 +2071,7 @@ pub fn peel_n_hir_expr_refs(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'a>,
 
 /// Peels off all references on the expression. Returns the underlying expression and the number of
 /// references removed.
-pub fn peel_hir_expr_refs(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
+pub fn peel_hir_expr_refs<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
     let mut count = 0;
     let e = peel_hir_expr_while(expr, |e| match e.kind {
         ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) => {
@@ -2151,7 +2154,7 @@ impl<'hir> ItemLikeVisitor<'hir> for TestItemNamesVisitor<'hir> {
 
 static TEST_ITEM_NAMES_CACHE: SyncOnceCell<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = SyncOnceCell::new();
 
-fn with_test_item_names(tcx: TyCtxt<'tcx>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
+fn with_test_item_names<'tcx>(tcx: TyCtxt<'tcx>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
     let cache = TEST_ITEM_NAMES_CACHE.get_or_init(|| Mutex::new(FxHashMap::default()));
     let mut map: MutexGuard<'_, FxHashMap<LocalDefId, Vec<Symbol>>> = cache.lock().unwrap();
     match map.entry(module) {

clippy_utils/src/macros.rs

@@ -283,7 +283,7 @@ fn find_assert_within_debug_assert<'a>(
     found
 }
 
-fn is_assert_arg(cx: &LateContext<'_>, expr: &'a Expr<'a>, assert_expn: ExpnId) -> bool {
+fn is_assert_arg(cx: &LateContext<'_>, expr: &Expr<'_>, assert_expn: ExpnId) -> bool {
     if !expr.span.from_expansion() {
         return true;
     }
@@ -322,7 +322,7 @@ pub struct FormatArgsExpn<'tcx> {
     pub specs: Vec<&'tcx Expr<'tcx>>,
 }
 
-impl FormatArgsExpn<'tcx> {
+impl<'tcx> FormatArgsExpn<'tcx> {
     /// Parses an expanded `format_args!` or `format_args_nl!` invocation
     pub fn parse(cx: &LateContext<'_>, expr: &'tcx Expr<'tcx>) -> Option<Self> {
         macro_backtrace(expr.span).find(|macro_call| {

clippy_utils/src/qualify_min_const_fn.rs

@@ -19,7 +19,7 @@ use std::borrow::Cow;
 
 type McfResult = Result<(), (Span, Cow<'static, str>)>;
 
-pub fn is_min_const_fn(tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, msrv: Option<&RustcVersion>) -> McfResult {
+pub fn is_min_const_fn<'a, 'tcx>(tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, msrv: Option<&RustcVersion>) -> McfResult {
     let def_id = body.source.def_id();
     let mut current = def_id;
     loop {
@@ -85,7 +85,7 @@ pub fn is_min_const_fn(tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, msrv: Option<&Ru
     Ok(())
 }
 
-fn check_ty(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) -> McfResult {
+fn check_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) -> McfResult {
     for arg in ty.walk(tcx) {
         let ty = match arg.unpack() {
             GenericArgKind::Type(ty) => ty,
@@ -133,7 +133,13 @@ fn check_ty(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) -> McfResult {
     Ok(())
 }
 
-fn check_rvalue(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, def_id: DefId, rvalue: &Rvalue<'tcx>, span: Span) -> McfResult {
+fn check_rvalue<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    body: &Body<'tcx>,
+    def_id: DefId,
+    rvalue: &Rvalue<'tcx>,
+    span: Span,
+) -> McfResult {
     match rvalue {
         Rvalue::ThreadLocalRef(_) => Err((span, "cannot access thread local storage in const fn".into())),
         Rvalue::Repeat(operand, _) | Rvalue::Use(operand) => check_operand(tcx, operand, span, body),
@@ -211,7 +217,12 @@ fn check_rvalue(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, def_id: DefId, rvalue: &Rv
     }
 }
 
-fn check_statement(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, def_id: DefId, statement: &Statement<'tcx>) -> McfResult {
+fn check_statement<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    body: &Body<'tcx>,
+    def_id: DefId,
+    statement: &Statement<'tcx>,
+) -> McfResult {
     let span = statement.source_info.span;
     match &statement.kind {
         StatementKind::Assign(box (place, rval)) => {
@@ -240,7 +251,7 @@ fn check_statement(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, def_id: DefId, statemen
     }
 }
 
-fn check_operand(tcx: TyCtxt<'tcx>, operand: &Operand<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult {
+fn check_operand<'tcx>(tcx: TyCtxt<'tcx>, operand: &Operand<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult {
     match operand {
         Operand::Move(place) | Operand::Copy(place) => check_place(tcx, *place, span, body),
         Operand::Constant(c) => match c.check_static_ptr(tcx) {
@@ -250,7 +261,7 @@ fn check_operand(tcx: TyCtxt<'tcx>, operand: &Operand<'tcx>, span: Span, body: &
     }
 }
 
-fn check_place(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult {
+fn check_place<'tcx>(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult {
     let mut cursor = place.projection.as_ref();
     while let [ref proj_base @ .., elem] = *cursor {
         cursor = proj_base;
@@ -275,7 +286,7 @@ fn check_place(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &Body<'t
     Ok(())
 }
 
-fn check_terminator(
+fn check_terminator<'a, 'tcx>(
     tcx: TyCtxt<'tcx>,
     body: &'a Body<'tcx>,
     terminator: &Terminator<'tcx>,

clippy_utils/src/source.rs

@@ -281,7 +281,7 @@ pub fn snippet_block_with_applicability<'a, T: LintContext>(
 /// correctly get a snippet of `vec![]`.
 ///
 /// This will also return whether or not the snippet is a macro call.
-pub fn snippet_with_context(
+pub fn snippet_with_context<'a>(
     cx: &LateContext<'_>,
     span: Span,
     outer: SyntaxContext,

clippy_utils/src/sugg.rs

@@ -461,7 +461,7 @@ impl Neg for Sugg<'_> {
     }
 }
 
-impl Not for Sugg<'a> {
+impl<'a> Not for Sugg<'a> {
     type Output = Sugg<'a>;
     fn not(self) -> Sugg<'a> {
         use AssocOp::{Equal, Greater, GreaterEqual, Less, LessEqual, NotEqual};
@@ -846,7 +846,7 @@ struct DerefDelegate<'a, 'tcx> {
     applicability: Applicability,
 }
 
-impl DerefDelegate<'_, 'tcx> {
+impl<'tcx> DerefDelegate<'_, 'tcx> {
     /// build final suggestion:
     /// - create the ending part of suggestion
     /// - concatenate starting and ending parts

clippy_utils/src/ty.rs

@@ -25,7 +25,7 @@ pub fn is_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
 }
 
 /// Checks whether a type can be partially moved.
-pub fn can_partially_move_ty(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+pub fn can_partially_move_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
     if has_drop(cx, ty) || is_copy(cx, ty) {
         return false;
     }
@@ -366,7 +366,7 @@ pub fn walk_ptrs_ty_depth(ty: Ty<'_>) -> (Ty<'_>, usize) {
 
 /// Returns `true` if types `a` and `b` are same types having same `Const` generic args,
 /// otherwise returns `false`
-pub fn same_type_and_consts(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
+pub fn same_type_and_consts<'tcx>(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
     match (&a.kind(), &b.kind()) {
         (&ty::Adt(did_a, substs_a), &ty::Adt(did_b, substs_b)) => {
             if did_a != did_b {

clippy_utils/src/visitors.rs

@@ -173,7 +173,7 @@ pub trait Visitable<'tcx> {
 }
 macro_rules! visitable_ref {
     ($t:ident, $f:ident) => {
-        impl Visitable<'tcx> for &'tcx $t<'tcx> {
+        impl<'tcx> Visitable<'tcx> for &'tcx $t<'tcx> {
             fn visit<V: Visitor<'tcx>>(self, visitor: &mut V) {
                 visitor.$f(self);
             }
@@ -217,7 +217,7 @@ pub fn is_res_used(cx: &LateContext<'_>, res: Res, body: BodyId) -> bool {
 }
 
 /// Checks if the given local is used.
-pub fn is_local_used(cx: &LateContext<'tcx>, visitable: impl Visitable<'tcx>, id: HirId) -> bool {
+pub fn is_local_used<'tcx>(cx: &LateContext<'tcx>, visitable: impl Visitable<'tcx>, id: HirId) -> bool {
     let mut is_used = false;
     let mut visitor = expr_visitor(cx, |expr| {
         if !is_used {
@@ -231,7 +231,7 @@ pub fn is_local_used(cx: &LateContext<'tcx>, visitable: impl Visitable<'tcx>, id
 }
 
 /// Checks if the given expression is a constant.
-pub fn is_const_evaluatable(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
+pub fn is_const_evaluatable<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
     struct V<'a, 'tcx> {
         cx: &'a LateContext<'tcx>,
         is_const: bool,
@@ -321,7 +321,7 @@ pub fn is_const_evaluatable(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
 }
 
 /// Checks if the given expression performs an unsafe operation outside of an unsafe block.
-pub fn is_expr_unsafe(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
+pub fn is_expr_unsafe<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
     struct V<'a, 'tcx> {
         cx: &'a LateContext<'tcx>,
         is_unsafe: bool,

doc/common_tools_writing_lints.md

@@ -60,7 +60,7 @@ Two noticeable items here:
 Starting with an `expr`, you can check whether it is calling a specific method `some_method`:
 
 ```rust
-impl LateLintPass<'_> for MyStructLint {
+impl<'tcx> LateLintPass<'tcx> for MyStructLint {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
         if_chain! {
             // Check our expr is calling a method