Fix warnings about unnecessary lifetime bounds

Rustup rust-lang/rust#61172

Author: tesuji

clippy_lints/src/assign_ops.rs

@@ -236,13 +236,13 @@ fn is_commutative(op: hir::BinOpKind) -> bool {
     }
 }
 
-struct ExprVisitor<'a, 'tcx: 'a> {
+struct ExprVisitor<'a, 'tcx> {
     assignee: &'a hir::Expr,
     counter: u8,
     cx: &'a LateContext<'a, 'tcx>,
 }
 
-impl<'a, 'tcx: 'a> Visitor<'tcx> for ExprVisitor<'a, 'tcx> {
+impl<'a, 'tcx> Visitor<'tcx> for ExprVisitor<'a, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
         if SpanlessEq::new(self.cx).ignore_fn().eq_expr(self.assignee, expr) {
             self.counter += 1;

clippy_lints/src/block_in_if_condition.rs

@@ -44,12 +44,12 @@ declare_clippy_lint! {
 
 declare_lint_pass!(BlockInIfCondition => [BLOCK_IN_IF_CONDITION_EXPR, BLOCK_IN_IF_CONDITION_STMT]);
 
-struct ExVisitor<'a, 'tcx: 'a> {
+struct ExVisitor<'a, 'tcx> {
     found_block: Option<&'tcx Expr>,
     cx: &'a LateContext<'a, 'tcx>,
 }
 
-impl<'a, 'tcx: 'a> Visitor<'tcx> for ExVisitor<'a, 'tcx> {
+impl<'a, 'tcx> Visitor<'tcx> for ExVisitor<'a, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx Expr) {
         if let ExprKind::Closure(_, _, eid, _, _) = expr.node {
             let body = self.cx.tcx.hir().body(eid);

clippy_lints/src/booleans.rs

@@ -68,12 +68,12 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NonminimalBool {
     }
 }
 
-struct NonminimalBoolVisitor<'a, 'tcx: 'a> {
+struct NonminimalBoolVisitor<'a, 'tcx> {
     cx: &'a LateContext<'a, 'tcx>,
 }
 
 use quine_mc_cluskey::Bool;
-struct Hir2Qmm<'a, 'tcx: 'a, 'v> {
+struct Hir2Qmm<'a, 'tcx, 'v> {
     terminals: Vec<&'v Expr>,
     cx: &'a LateContext<'a, 'tcx>,
 }
@@ -155,7 +155,7 @@ impl<'a, 'tcx, 'v> Hir2Qmm<'a, 'tcx, 'v> {
     }
 }
 
-struct SuggestContext<'a, 'tcx: 'a, 'v> {
+struct SuggestContext<'a, 'tcx, 'v> {
     terminals: &'v [&'v Expr],
     cx: &'a LateContext<'a, 'tcx>,
     output: String,

clippy_lints/src/cognitive_complexity.rs

@@ -41,7 +41,7 @@ impl CognitiveComplexity {
 impl_lint_pass!(CognitiveComplexity => [COGNITIVE_COMPLEXITY]);
 
 impl CognitiveComplexity {
-    fn check<'a, 'tcx: 'a>(&mut self, cx: &'a LateContext<'a, 'tcx>, body: &'tcx Body, span: Span) {
+    fn check<'a, 'tcx>(&mut self, cx: &'a LateContext<'a, 'tcx>, body: &'tcx Body, span: Span) {
         if in_macro_or_desugar(span) {
             return;
         }
@@ -132,7 +132,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for CognitiveComplexity {
     }
 }
 
-struct CCHelper<'a, 'tcx: 'a> {
+struct CCHelper<'a, 'tcx> {
     match_arms: u64,
     divergence: u64,
     returns: u64,

clippy_lints/src/consts.rs

@@ -210,7 +210,7 @@ pub fn constant_context<'c, 'cc>(
     }
 }
 
-pub struct ConstEvalLateContext<'a, 'tcx: 'a> {
+pub struct ConstEvalLateContext<'a, 'tcx> {
     lcx: &'a LateContext<'a, 'tcx>,
     tables: &'a ty::TypeckTables<'tcx>,
     param_env: ty::ParamEnv<'tcx>,

clippy_lints/src/entry.rs

@@ -112,7 +112,7 @@ fn check_cond<'a, 'tcx, 'b>(
     None
 }
 
-struct InsertVisitor<'a, 'tcx: 'a, 'b> {
+struct InsertVisitor<'a, 'tcx, 'b> {
     cx: &'a LateContext<'a, 'tcx>,
     span: Span,
     ty: &'static str,

clippy_lints/src/escape.rs

@@ -43,7 +43,7 @@ fn is_non_trait_box(ty: Ty<'_>) -> bool {
     ty.is_box() && !ty.boxed_ty().is_trait()
 }
 
-struct EscapeDelegate<'a, 'tcx: 'a> {
+struct EscapeDelegate<'a, 'tcx> {
     cx: &'a LateContext<'a, 'tcx>,
     set: HirIdSet,
     too_large_for_stack: u64,

clippy_lints/src/eval_order_dependence.rs

@@ -92,7 +92,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EvalOrderDependence {
     }
 }
 
-struct DivergenceVisitor<'a, 'tcx: 'a> {
+struct DivergenceVisitor<'a, 'tcx> {
     cx: &'a LateContext<'a, 'tcx>,
 }
 
@@ -272,7 +272,7 @@ fn check_stmt<'a, 'tcx>(vis: &mut ReadVisitor<'a, 'tcx>, stmt: &'tcx Stmt) -> St
 }
 
 /// A visitor that looks for reads from a variable.
-struct ReadVisitor<'a, 'tcx: 'a> {
+struct ReadVisitor<'a, 'tcx> {
     cx: &'a LateContext<'a, 'tcx>,
     /// The ID of the variable we're looking for.
     var: HirId,

clippy_lints/src/fallible_impl_from.rs

@@ -49,13 +49,13 @@ fn lint_impl_body<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, impl_span: Span, impl_it
     use rustc::hir::intravisit::{self, NestedVisitorMap, Visitor};
     use rustc::hir::*;
 
-    struct FindPanicUnwrap<'a, 'tcx: 'a> {
+    struct FindPanicUnwrap<'a, 'tcx> {
         lcx: &'a LateContext<'a, 'tcx>,
         tables: &'tcx ty::TypeckTables<'tcx>,
         result: Vec<Span>,
     }
 
-    impl<'a, 'tcx: 'a> Visitor<'tcx> for FindPanicUnwrap<'a, 'tcx> {
+    impl<'a, 'tcx> Visitor<'tcx> for FindPanicUnwrap<'a, 'tcx> {
         fn visit_expr(&mut self, expr: &'tcx Expr) {
             // check for `begin_panic`
             if_chain! {

clippy_lints/src/functions.rs

@@ -291,7 +291,7 @@ fn raw_ptr_arg(arg: &hir::Arg, ty: &hir::Ty) -> Option<hir::HirId> {
     }
 }
 
-struct DerefVisitor<'a, 'tcx: 'a> {
+struct DerefVisitor<'a, 'tcx> {
     cx: &'a LateContext<'a, 'tcx>,
     ptrs: FxHashSet<hir::HirId>,
     tables: &'a ty::TypeckTables<'tcx>,
@@ -330,7 +330,7 @@ impl<'a, 'tcx> hir::intravisit::Visitor<'tcx> for DerefVisitor<'a, 'tcx> {
     }
 }
 
-impl<'a, 'tcx: 'a> DerefVisitor<'a, 'tcx> {
+impl<'a, 'tcx> DerefVisitor<'a, 'tcx> {
     fn check_arg(&self, ptr: &hir::Expr) {
         if let hir::ExprKind::Path(ref qpath) = ptr.node {
             if let Res::Local(id) = self.cx.tables.qpath_res(qpath, ptr.hir_id) {