librustc_typeck: deny(elided_lifetimes_in_paths)

src/librustc_typeck/astconv.rs

@@ -196,7 +196,7 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
 
     /// Report error if there is an explicit type parameter when using `impl Trait`.
     fn check_impl_trait(
-        tcx: TyCtxt,
+        tcx: TyCtxt<'_, '_, '_>,
         span: Span,
         seg: &hir::PathSegment,
         generics: &ty::Generics,
@@ -227,7 +227,7 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
     /// Checks that the correct number of generic arguments have been provided.
     /// Used specifically for function calls.
     pub fn check_generic_arg_count_for_call(
-        tcx: TyCtxt,
+        tcx: TyCtxt<'_, '_, '_>,
         span: Span,
         def: &ty::Generics,
         seg: &hir::PathSegment,
@@ -259,7 +259,7 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
     /// Checks that the correct number of generic arguments have been provided.
     /// This is used both for datatypes and function calls.
     fn check_generic_arg_count(
-        tcx: TyCtxt,
+        tcx: TyCtxt<'_, '_, '_>,
         span: Span,
         def: &ty::Generics,
         args: &hir::GenericArgs,
@@ -1502,7 +1502,7 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
         has_err
     }
 
-    pub fn prohibit_assoc_ty_binding(tcx: TyCtxt, span: Span) {
+    pub fn prohibit_assoc_ty_binding(tcx: TyCtxt<'_, '_, '_>, span: Span) {
         let mut err = struct_span_err!(tcx.sess, span, E0229,
                                        "associated type bindings are not allowed here");
         err.span_label(span, "associated type not allowed here").emit();

src/librustc_typeck/check/_match.rs

@@ -183,7 +183,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                 let rhs_ty = self.check_expr(end);
 
                 // Check that both end-points are of numeric or char type.
-                let numeric_or_char = |ty: Ty| ty.is_numeric() || ty.is_char();
+                let numeric_or_char = |ty: Ty<'_>| ty.is_numeric() || ty.is_char();
                 let lhs_compat = numeric_or_char(lhs_ty);
                 let rhs_compat = numeric_or_char(rhs_ty);
 

src/librustc_typeck/check/callee.rs

@@ -18,7 +18,7 @@ use rustc::hir;
 /// Checks that it is legal to call methods of the trait corresponding
 /// to `trait_id` (this only cares about the trait, not the specific
 /// method that is called).
-pub fn check_legal_trait_for_method_call(tcx: TyCtxt, span: Span, trait_id: DefId) {
+pub fn check_legal_trait_for_method_call(tcx: TyCtxt<'_, '_, '_>, span: Span, trait_id: DefId) {
     if tcx.lang_items().drop_trait() == Some(trait_id) {
         struct_span_err!(tcx.sess, span, E0040, "explicit use of destructor method")
             .span_label(span, "explicit destructor calls not allowed")

src/librustc_typeck/check/closure.rs

@@ -574,7 +574,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         expr_def_id: DefId,
         decl: &hir::FnDecl,
     ) -> ty::PolyFnSig<'tcx> {
-        let astconv: &dyn AstConv = self;
+        let astconv: &dyn AstConv<'_, '_> = self;
 
         // First, convert the types that the user supplied (if any).
         let supplied_arguments = decl.inputs.iter().map(|a| astconv.ast_ty_to_ty(a));
@@ -606,7 +606,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     /// so should yield an error, but returns back a signature where
     /// all parameters are of type `TyErr`.
     fn error_sig_of_closure(&self, decl: &hir::FnDecl) -> ty::PolyFnSig<'tcx> {
-        let astconv: &dyn AstConv = self;
+        let astconv: &dyn AstConv<'_, '_> = self;
 
         let supplied_arguments = decl.inputs.iter().map(|a| {
             // Convert the types that the user supplied (if any), but ignore them.

src/librustc_typeck/check/coercion.rs

@@ -101,7 +101,7 @@ fn coerce_mutbls<'tcx>(from_mutbl: hir::Mutability,
     }
 }
 
-fn identity(_: Ty) -> Vec<Adjustment> { vec![] }
+fn identity(_: Ty<'_>) -> Vec<Adjustment<'_>> { vec![] }
 
 fn simple<'tcx>(kind: Adjust<'tcx>) -> impl FnOnce(Ty<'tcx>) -> Vec<Adjustment<'tcx>> {
     move |target| vec![Adjustment { kind, target }]
@@ -1084,7 +1084,7 @@ impl<'gcx, 'tcx, 'exprs, E> CoerceMany<'gcx, 'tcx, 'exprs, E>
     pub fn coerce_forced_unit<'a>(&mut self,
                                   fcx: &FnCtxt<'a, 'gcx, 'tcx>,
                                   cause: &ObligationCause<'tcx>,
-                                  augment_error: &mut dyn FnMut(&mut DiagnosticBuilder),
+                                  augment_error: &mut dyn FnMut(&mut DiagnosticBuilder<'_>),
                                   label_unit_as_expected: bool)
     {
         self.coerce_inner(fcx,
@@ -1103,7 +1103,7 @@ impl<'gcx, 'tcx, 'exprs, E> CoerceMany<'gcx, 'tcx, 'exprs, E>
                         cause: &ObligationCause<'tcx>,
                         expression: Option<&'gcx hir::Expr>,
                         mut expression_ty: Ty<'tcx>,
-                        augment_error: Option<&mut dyn FnMut(&mut DiagnosticBuilder)>,
+                        augment_error: Option<&mut dyn FnMut(&mut DiagnosticBuilder<'_>)>,
                         label_expression_as_expected: bool)
     {
         // Incorporate whatever type inference information we have

src/librustc_typeck/check/compare_method.rs

@@ -408,7 +408,7 @@ fn check_region_bounds_on_impl_method<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
 fn extract_spans_for_error_reporting<'a, 'gcx, 'tcx>(infcx: &infer::InferCtxt<'a, 'gcx, 'tcx>,
                                                      param_env: ty::ParamEnv<'tcx>,
-                                                     terr: &TypeError,
+                                                     terr: &TypeError<'_>,
                                                      cause: &ObligationCause<'tcx>,
                                                      impl_m: &ty::AssociatedItem,
                                                      impl_sig: ty::FnSig<'tcx>,

src/librustc_typeck/check/demand.rs

@@ -544,7 +544,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
             };
 
             let into_sugg = into_suggestion.clone();
-            let suggest_to_change_suffix_or_into = |err: &mut DiagnosticBuilder,
+            let suggest_to_change_suffix_or_into = |err: &mut DiagnosticBuilder<'_>,
                                                     note: Option<&str>| {
                 let suggest_msg = if literal_is_ty_suffixed(expr) {
                     format!(

src/librustc_typeck/check/method/confirm.rs

@@ -598,7 +598,7 @@ impl<'a, 'gcx, 'tcx> ConfirmContext<'a, 'gcx, 'tcx> {
             })
     }
 
-    fn enforce_illegal_method_limitations(&self, pick: &probe::Pick) {
+    fn enforce_illegal_method_limitations(&self, pick: &probe::Pick<'_>) {
         // Disallow calls to the method `drop` defined in the `Drop` trait.
         match pick.item.container {
             ty::TraitContainer(trait_def_id) => {

src/librustc_typeck/check/method/probe.rs

@@ -388,7 +388,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     }
 }
 
-pub fn provide(providers: &mut ty::query::Providers) {
+pub fn provide(providers: &mut ty::query::Providers<'_>) {
     providers.method_autoderef_steps = method_autoderef_steps;
 }
 
@@ -1180,7 +1180,7 @@ impl<'a, 'gcx, 'tcx> ProbeContext<'a, 'gcx, 'tcx> {
 
     fn emit_unstable_name_collision_hint(
         &self,
-        stable_pick: &Pick,
+        stable_pick: &Pick<'_>,
         unstable_candidates: &[(&Candidate<'tcx>, Symbol)],
     ) {
         let mut diag = self.tcx.struct_span_lint_hir(

src/librustc_typeck/check/method/suggest.rs

@@ -72,7 +72,8 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
             return;
         }
 
-        let report_candidates = |err: &mut DiagnosticBuilder, mut sources: Vec<CandidateSource>| {
+        let report_candidates = |err: &mut DiagnosticBuilder<'_>,
+                                 mut sources: Vec<CandidateSource>| {
             sources.sort();
             sources.dedup();
             // Dynamic limit to avoid hiding just one candidate, which is silly.
@@ -497,7 +498,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     }
 
     fn suggest_use_candidates(&self,
-                              err: &mut DiagnosticBuilder,
+                              err: &mut DiagnosticBuilder<'_>,
                               mut msg: String,
                               candidates: Vec<DefId>) {
         let module_did = self.tcx.hir().get_module_parent_by_hir_id(self.body_id);
@@ -549,7 +550,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     }
 
     fn suggest_valid_traits(&self,
-                            err: &mut DiagnosticBuilder,
+                            err: &mut DiagnosticBuilder<'_>,
                             valid_out_of_scope_traits: Vec<DefId>) -> bool {
         if !valid_out_of_scope_traits.is_empty() {
             let mut candidates = valid_out_of_scope_traits;
@@ -577,7 +578,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     }
 
     fn suggest_traits_to_import<'b>(&self,
-                                    err: &mut DiagnosticBuilder,
+                                    err: &mut DiagnosticBuilder<'_>,
                                     span: Span,
                                     rcvr_ty: Ty<'tcx>,
                                     item_name: ast::Ident,
@@ -648,8 +649,8 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     fn type_derefs_to_local(&self,
                             span: Span,
                             rcvr_ty: Ty<'tcx>,
-                            source: SelfSource) -> bool {
-        fn is_local(ty: Ty) -> bool {
+                            source: SelfSource<'_>) -> bool {
+        fn is_local(ty: Ty<'_>) -> bool {
             match ty.sty {
                 ty::Adt(def, _) => def.did.is_local(),
                 ty::Foreign(did) => did.is_local(),
@@ -749,7 +750,7 @@ fn compute_all_traits<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Vec<DefId>
     // Cross-crate:
 
     let mut external_mods = FxHashSet::default();
-    fn handle_external_def(tcx: TyCtxt,
+    fn handle_external_def(tcx: TyCtxt<'_, '_, '_>,
                            traits: &mut Vec<DefId>,
                            external_mods: &mut FxHashSet<DefId>,
                            def: Def) {
@@ -779,7 +780,7 @@ fn compute_all_traits<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Vec<DefId>
     traits
 }
 
-pub fn provide(providers: &mut ty::query::Providers) {
+pub fn provide(providers: &mut ty::query::Providers<'_>) {
     providers.all_traits = |tcx, cnum| {
         assert_eq!(cnum, LOCAL_CRATE);
         Lrc::new(compute_all_traits(tcx))

src/librustc_typeck/check/mod.rs

@@ -738,7 +738,7 @@ fn check_impl_item_well_formed<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: De
     wfcheck::check_impl_item(tcx, def_id);
 }
 
-pub fn provide(providers: &mut Providers) {
+pub fn provide(providers: &mut Providers<'_>) {
     method::provide(providers);
     *providers = Providers {
         typeck_item_bodies,
@@ -1437,7 +1437,7 @@ pub fn check_item_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, it: &'tcx hir::Ite
     }
 }
 
-fn maybe_check_static_with_link_section(tcx: TyCtxt, id: DefId, span: Span) {
+fn maybe_check_static_with_link_section(tcx: TyCtxt<'_, '_, '_>, id: DefId, span: Span) {
     // Only restricted on wasm32 target for now
     if !tcx.sess.opts.target_triple.triple().starts_with("wasm32") {
         return
@@ -2122,7 +2122,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     }
 
     pub fn tag(&self) -> String {
-        let self_ptr: *const FnCtxt = self;
+        let self_ptr: *const FnCtxt<'_, '_, '_> = self;
         format!("{:?}", self_ptr)
     }
 
@@ -3369,7 +3369,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         // (`only_has_type`); otherwise, we just go with a
         // fresh type variable.
         let coerce_to_ty = expected.coercion_target_type(self, sp);
-        let mut coerce: DynamicCoerceMany = CoerceMany::new(coerce_to_ty);
+        let mut coerce: DynamicCoerceMany<'_, '_> = CoerceMany::new(coerce_to_ty);
 
         coerce.coerce(self, &self.misc(sp), then_expr, then_ty);
 
@@ -5043,7 +5043,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     }
 
     /// Given a function `Node`, return its `FnDecl` if it exists, or `None` otherwise.
-    fn get_node_fn_decl(&self, node: Node) -> Option<(hir::FnDecl, ast::Ident, bool)> {
+    fn get_node_fn_decl(&self, node: Node<'_>) -> Option<(hir::FnDecl, ast::Ident, bool)> {
         match node {
             Node::Item(&hir::Item {
                 ident, node: hir::ItemKind::Fn(ref decl, ..), ..

src/librustc_typeck/check/op.rs

@@ -416,7 +416,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         rhs_expr: &'gcx hir::Expr,
         lhs_ty: Ty<'tcx>,
         rhs_ty: Ty<'tcx>,
-        err: &mut errors::DiagnosticBuilder,
+        err: &mut errors::DiagnosticBuilder<'_>,
         is_assign: bool,
     ) -> bool {
         let source_map = self.tcx.sess.source_map();
@@ -688,7 +688,7 @@ enum Op {
 /// Reason #2 is the killer. I tried for a while to always use
 /// overloaded logic and just check the types in constants/codegen after
 /// the fact, and it worked fine, except for SIMD types. -nmatsakis
-fn is_builtin_binop(lhs: Ty, rhs: Ty, op: hir::BinOp) -> bool {
+fn is_builtin_binop(lhs: Ty<'_>, rhs: Ty<'_>, op: hir::BinOp) -> bool {
     match BinOpCategory::from(op) {
         BinOpCategory::Shortcircuit => {
             true

src/librustc_typeck/check/upvar.rs

@@ -649,6 +649,6 @@ impl<'a, 'gcx, 'tcx> euv::Delegate<'tcx> for InferBorrowKind<'a, 'gcx, 'tcx> {
     }
 }
 
-fn var_name(tcx: TyCtxt, var_hir_id: hir::HirId) -> ast::Name {
+fn var_name(tcx: TyCtxt<'_, '_, '_>, var_hir_id: hir::HirId) -> ast::Name {
     tcx.hir().name_by_hir_id(var_hir_id)
 }

src/librustc_typeck/check/wfcheck.rs

@@ -938,7 +938,7 @@ fn report_bivariance<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     err.emit();
 }
 
-fn reject_shadowing_parameters(tcx: TyCtxt, def_id: DefId) {
+fn reject_shadowing_parameters(tcx: TyCtxt<'_, '_, '_>, def_id: DefId) {
     let generics = tcx.generics_of(def_id);
     let parent = tcx.generics_of(generics.parent.unwrap());
     let impl_params: FxHashMap<_, _> = parent.params.iter().flat_map(|param| match param.kind {
@@ -1093,7 +1093,7 @@ fn error_392<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, span: Span, param_name: ast:
     err
 }
 
-fn error_194(tcx: TyCtxt, span: Span, trait_decl_span: Span, name: &str) {
+fn error_194(tcx: TyCtxt<'_, '_, '_>, span: Span, trait_decl_span: Span, name: &str) {
     struct_span_err!(tcx.sess, span, E0194,
                      "type parameter `{}` shadows another type parameter of the same name",
                      name)

src/librustc_typeck/check/writeback.rs

@@ -729,30 +729,30 @@ impl<'cx, 'gcx, 'tcx> WritebackCx<'cx, 'gcx, 'tcx> {
 }
 
 trait Locatable {
-    fn to_span(&self, tcx: &TyCtxt) -> Span;
+    fn to_span(&self, tcx: &TyCtxt<'_, '_, '_>) -> Span;
 }
 
 impl Locatable for Span {
-    fn to_span(&self, _: &TyCtxt) -> Span {
+    fn to_span(&self, _: &TyCtxt<'_, '_, '_>) -> Span {
         *self
     }
 }
 
 impl Locatable for ast::NodeId {
-    fn to_span(&self, tcx: &TyCtxt) -> Span {
+    fn to_span(&self, tcx: &TyCtxt<'_, '_, '_>) -> Span {
         tcx.hir().span(*self)
     }
 }
 
 impl Locatable for DefIndex {
-    fn to_span(&self, tcx: &TyCtxt) -> Span {
+    fn to_span(&self, tcx: &TyCtxt<'_, '_, '_>) -> Span {
         let hir_id = tcx.hir().def_index_to_hir_id(*self);
         tcx.hir().span_by_hir_id(hir_id)
     }
 }
 
 impl Locatable for hir::HirId {
-    fn to_span(&self, tcx: &TyCtxt) -> Span {
+    fn to_span(&self, tcx: &TyCtxt<'_, '_, '_>) -> Span {
         tcx.hir().span_by_hir_id(*self)
     }
 }

src/librustc_typeck/coherence/inherent_impls_overlap.rs

@@ -20,7 +20,7 @@ struct InherentOverlapChecker<'a, 'tcx: 'a> {
 
 impl<'a, 'tcx> InherentOverlapChecker<'a, 'tcx> {
     fn check_for_common_items_in_impls(&self, impl1: DefId, impl2: DefId,
-                                       overlap: traits::OverlapResult,
+                                       overlap: traits::OverlapResult<'_>,
                                        used_to_be_allowed: bool) {
 
         let name_and_namespace = |def_id| {

src/librustc_typeck/coherence/mod.rs

@@ -41,7 +41,11 @@ fn check_impl<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, node_id: ast::NodeId) {
     }
 }
 
-fn enforce_trait_manually_implementable(tcx: TyCtxt, impl_def_id: DefId, trait_def_id: DefId) {
+fn enforce_trait_manually_implementable(
+    tcx: TyCtxt<'_, '_, '_>,
+    impl_def_id: DefId,
+    trait_def_id: DefId
+) {
     let did = Some(trait_def_id);
     let li = tcx.lang_items();
     let span = tcx.sess.source_map().def_span(tcx.span_of_impl(impl_def_id).unwrap());
@@ -93,7 +97,11 @@ fn enforce_trait_manually_implementable(tcx: TyCtxt, impl_def_id: DefId, trait_d
 
 /// We allow impls of marker traits to overlap, so they can't override impls
 /// as that could make it ambiguous which associated item to use.
-fn enforce_empty_impls_for_marker_traits(tcx: TyCtxt, impl_def_id: DefId, trait_def_id: DefId) {
+fn enforce_empty_impls_for_marker_traits(
+    tcx: TyCtxt<'_, '_, '_>,
+    impl_def_id: DefId,
+    trait_def_id: DefId
+) {
     if !tcx.trait_def(trait_def_id).is_marker {
         return;
     }
@@ -110,7 +118,7 @@ fn enforce_empty_impls_for_marker_traits(tcx: TyCtxt, impl_def_id: DefId, trait_
         .emit();
 }
 
-pub fn provide(providers: &mut Providers) {
+pub fn provide(providers: &mut Providers<'_>) {
     use self::builtin::coerce_unsized_info;
     use self::inherent_impls::{crate_inherent_impls, inherent_impls};
     use self::inherent_impls_overlap::crate_inherent_impls_overlap_check;

src/librustc_typeck/collect.rs

@@ -1406,7 +1406,7 @@ fn find_existential_constraints<'a, 'tcx>(
                         ty::Param(p) => Some(*index_map.get(p).unwrap()),
                         _ => None,
                     }).collect();
-                let is_param = |ty: ty::Ty| match ty.sty {
+                let is_param = |ty: ty::Ty<'_>| match ty.sty {
                     ty::Param(_) => true,
                     _ => false,
                 };
@@ -2216,7 +2216,7 @@ fn compute_sig_of_foreign_fn_decl<'a, 'tcx>(
         && abi != abi::Abi::PlatformIntrinsic
         && !tcx.features().simd_ffi
     {
-        let check = |ast_ty: &hir::Ty, ty: Ty| {
+        let check = |ast_ty: &hir::Ty, ty: Ty<'_>| {
             if ty.is_simd() {
                 tcx.sess
                    .struct_span_err(
@@ -2251,7 +2251,7 @@ fn is_foreign_item<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> bool
 }
 
 fn from_target_feature(
-    tcx: TyCtxt,
+    tcx: TyCtxt<'_, '_, '_>,
     id: DefId,
     attr: &ast::Attribute,
     whitelist: &FxHashMap<String, Option<String>>,

src/librustc_typeck/lib.rs

@@ -74,8 +74,6 @@ This API is completely unstable and subject to change.
 #![deny(rust_2018_idioms)]
 #![allow(explicit_outlives_requirements)]
 
-#![allow(elided_lifetimes_in_paths)] // WIP
-
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;
 

src/librustc_typeck/variance/mod.rs

@@ -27,7 +27,7 @@ pub mod test;
 /// Code for transforming variances.
 mod xform;
 
-pub fn provide(providers: &mut Providers) {
+pub fn provide(providers: &mut Providers<'_>) {
     *providers = Providers {
         variances_of,
         crate_variances,
@@ -91,4 +91,3 @@ fn variances_of<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, item_def_id: DefId)
                        .unwrap_or(&crate_map.empty_variance)
                        .clone()
 }
-

src/librustc_typeck/variance/solve.rs

@@ -23,7 +23,7 @@ struct SolveContext<'a, 'tcx: 'a> {
     solutions: Vec<ty::Variance>,
 }
 
-pub fn solve_constraints(constraints_cx: ConstraintContext) -> ty::CrateVariancesMap {
+pub fn solve_constraints(constraints_cx: ConstraintContext<'_, '_>) -> ty::CrateVariancesMap {
     let ConstraintContext { terms_cx, constraints, .. } = constraints_cx;
 
     let mut solutions = vec![ty::Bivariant; terms_cx.inferred_terms.len()];

src/librustc_typeck/variance/terms.rs

@@ -32,7 +32,7 @@ pub enum VarianceTerm<'a> {
 }
 
 impl<'a> fmt::Debug for VarianceTerm<'a> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
             ConstantTerm(c1) => write!(f, "{:?}", c1),
             TransformTerm(v1, v2) => write!(f, "({:?} \u{00D7} {:?})", v1, v2),
@@ -86,7 +86,7 @@ pub fn determine_parameters_to_be_inferred<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>
     terms_cx
 }
 
-fn lang_items(tcx: TyCtxt) -> Vec<(ast::NodeId, Vec<ty::Variance>)> {
+fn lang_items(tcx: TyCtxt<'_, '_, '_>) -> Vec<(ast::NodeId, Vec<ty::Variance>)> {
     let lang_items = tcx.lang_items();
     let all = vec![
         (lang_items.phantom_data(), vec![ty::Covariant]),