fix match_like_matches_macro in clippy

clippy_lints/src/assign_ops.rs

@@ -237,6 +237,7 @@ fn is_commutative(op: hir::BinOpKind) -> bool {
     use rustc_hir::BinOpKind::{
         Add, And, BitAnd, BitOr, BitXor, Div, Eq, Ge, Gt, Le, Lt, Mul, Ne, Or, Rem, Shl, Shr, Sub,
     };
+    #[allow(clippy::match_like_matches_macro)]
     match op {
         Add | Mul | And | Or | BitXor | BitAnd | BitOr | Eq | Ne => true,
         Sub | Div | Rem | Shl | Shr | Lt | Le | Ge | Gt => false,

clippy_lints/src/comparison_chain.rs

@@ -122,8 +122,5 @@ impl<'tcx> LateLintPass<'tcx> for ComparisonChain {
 }
 
 fn kind_is_cmp(kind: BinOpKind) -> bool {
-    match kind {
+    matches!(kind, BinOpKind::Lt | BinOpKind::Gt | BinOpKind::Eq)
-        BinOpKind::Lt | BinOpKind::Gt | BinOpKind::Eq => true,
-        _ => false,
-    }
 }

clippy_lints/src/eq_op.rs

@@ -214,20 +214,20 @@ impl<'tcx> LateLintPass<'tcx> for EqOp {
 }
 
 fn is_valid_operator(op: BinOp) -> bool {
-    match op.node {
+    matches!(
+        op.node,
         BinOpKind::Sub
-        | BinOpKind::Div
+            | BinOpKind::Div
-        | BinOpKind::Eq
+            | BinOpKind::Eq
-        | BinOpKind::Lt
+            | BinOpKind::Lt
-        | BinOpKind::Le
+            | BinOpKind::Le
-        | BinOpKind::Gt
+            | BinOpKind::Gt
-        | BinOpKind::Ge
+            | BinOpKind::Ge
-        | BinOpKind::Ne
+            | BinOpKind::Ne
-        | BinOpKind::And
+            | BinOpKind::And
-        | BinOpKind::Or
+            | BinOpKind::Or
-        | BinOpKind::BitXor
+            | BinOpKind::BitXor
-        | BinOpKind::BitAnd
+            | BinOpKind::BitAnd
-        | BinOpKind::BitOr => true,
+            | BinOpKind::BitOr
-        _ => false,
+    )
-    }
 }

clippy_lints/src/escape.rs

@@ -105,10 +105,7 @@ fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool {
         _ => return false,
     }
 
-    match map.find(map.get_parent_node(id)) {
+    matches!(map.find(map.get_parent_node(id)), Some(Node::Param(_)))
-        Some(Node::Param(_)) => true,
-        _ => false,
-    }
 }
 
 impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> {

clippy_lints/src/eta_reduction.rs

@@ -175,10 +175,7 @@ fn get_ufcs_type_name(cx: &LateContext<'_>, method_def_id: def_id::DefId, self_a
 fn match_borrow_depth(lhs: Ty<'_>, rhs: Ty<'_>) -> bool {
     match (&lhs.kind, &rhs.kind) {
         (ty::Ref(_, t1, mut1), ty::Ref(_, t2, mut2)) => mut1 == mut2 && match_borrow_depth(&t1, &t2),
-        (l, r) => match (l, r) {
+        (l, r) => !matches!((l, r), (ty::Ref(_, _, _), _) | (_, ty::Ref(_, _, _))),
-            (ty::Ref(_, _, _), _) | (_, ty::Ref(_, _, _)) => false,
-            (_, _) => true,
-        },
     }
 }
 

clippy_lints/src/formatting.rs

@@ -305,18 +305,10 @@ fn check_missing_else(cx: &EarlyContext<'_>, first: &Expr, second: &Expr) {
 }
 
 fn is_block(expr: &Expr) -> bool {
-    if let ExprKind::Block(..) = expr.kind {
+    matches!(expr.kind, ExprKind::Block(..))
-        true
-    } else {
-        false
-    }
 }
 
 /// Check if the expression is an `if` or `if let`
 fn is_if(expr: &Expr) -> bool {
-    if let ExprKind::If(..) = expr.kind {
+    matches!(expr.kind, ExprKind::If(..))
-        true
-    } else {
-        false
-    }
 }

clippy_lints/src/functions.rs

@@ -645,13 +645,7 @@ fn is_mutated_static(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> bool {
     use hir::ExprKind::{Field, Index, Path};
 
     match e.kind {
-        Path(ref qpath) => {
+        Path(ref qpath) => !matches!(qpath_res(cx, qpath, e.hir_id), Res::Local(_)),
-            if let Res::Local(_) = qpath_res(cx, qpath, e.hir_id) {
-                false
-            } else {
-                true
-            }
-        },
         Field(ref inner, _) | Index(ref inner, _) => is_mutated_static(cx, inner),
         _ => false,
     }

clippy_lints/src/lib.rs

@@ -277,7 +277,6 @@ mod question_mark;
 mod ranges;
 mod redundant_clone;
 mod redundant_field_names;
-mod redundant_pattern_matching;
 mod redundant_pub_crate;
 mod redundant_static_lifetimes;
 mod reference;
@@ -623,11 +622,13 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &matches::INFALLIBLE_DESTRUCTURING_MATCH,
         &matches::MATCH_AS_REF,
         &matches::MATCH_BOOL,
+        &matches::MATCH_LIKE_MATCHES_MACRO,
         &matches::MATCH_OVERLAPPING_ARM,
         &matches::MATCH_REF_PATS,
         &matches::MATCH_SINGLE_BINDING,
         &matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
         &matches::MATCH_WILD_ERR_ARM,
+        &matches::REDUNDANT_PATTERN_MATCHING,
         &matches::REST_PAT_IN_FULLY_BOUND_STRUCTS,
         &matches::SINGLE_MATCH,
         &matches::SINGLE_MATCH_ELSE,
@@ -757,7 +758,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &ranges::REVERSED_EMPTY_RANGES,
         &redundant_clone::REDUNDANT_CLONE,
         &redundant_field_names::REDUNDANT_FIELD_NAMES,
-        &redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING,
         &redundant_pub_crate::REDUNDANT_PUB_CRATE,
         &redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
         &reference::DEREF_ADDROF,
@@ -956,7 +956,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(|| box missing_doc::MissingDoc::new());
     store.register_late_pass(|| box missing_inline::MissingInline);
     store.register_late_pass(|| box if_let_some_result::OkIfLet);
-    store.register_late_pass(|| box redundant_pattern_matching::RedundantPatternMatching);
     store.register_late_pass(|| box partialeq_ne_impl::PartialEqNeImpl);
     store.register_late_pass(|| box unused_io_amount::UnusedIoAmount);
     let enum_variant_size_threshold = conf.enum_variant_size_threshold;
@@ -1295,9 +1294,11 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&map_unit_fn::RESULT_MAP_UNIT_FN),
         LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH),
         LintId::of(&matches::MATCH_AS_REF),
+        LintId::of(&matches::MATCH_LIKE_MATCHES_MACRO),
         LintId::of(&matches::MATCH_OVERLAPPING_ARM),
         LintId::of(&matches::MATCH_REF_PATS),
         LintId::of(&matches::MATCH_SINGLE_BINDING),
+        LintId::of(&matches::REDUNDANT_PATTERN_MATCHING),
         LintId::of(&matches::SINGLE_MATCH),
         LintId::of(&matches::WILDCARD_IN_OR_PATTERNS),
         LintId::of(&mem_discriminant::MEM_DISCRIMINANT_NON_ENUM),
@@ -1387,7 +1388,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&ranges::REVERSED_EMPTY_RANGES),
         LintId::of(&redundant_clone::REDUNDANT_CLONE),
         LintId::of(&redundant_field_names::REDUNDANT_FIELD_NAMES),
-        LintId::of(&redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING),
         LintId::of(&redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
         LintId::of(&reference::DEREF_ADDROF),
         LintId::of(&reference::REF_IN_DEREF),
@@ -1488,8 +1488,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE),
         LintId::of(&map_clone::MAP_CLONE),
         LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH),
+        LintId::of(&matches::MATCH_LIKE_MATCHES_MACRO),
         LintId::of(&matches::MATCH_OVERLAPPING_ARM),
         LintId::of(&matches::MATCH_REF_PATS),
+        LintId::of(&matches::REDUNDANT_PATTERN_MATCHING),
         LintId::of(&matches::SINGLE_MATCH),
         LintId::of(&mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
         LintId::of(&mem_replace::MEM_REPLACE_WITH_DEFAULT),
@@ -1526,7 +1528,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&ptr::PTR_ARG),
         LintId::of(&question_mark::QUESTION_MARK),
         LintId::of(&redundant_field_names::REDUNDANT_FIELD_NAMES),
-        LintId::of(&redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING),
         LintId::of(&redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
         LintId::of(&regex::TRIVIAL_REGEX),
         LintId::of(&returns::NEEDLESS_RETURN),

clippy_lints/src/lifetimes.rs

@@ -129,10 +129,10 @@ fn check_fn_inner<'tcx>(
     }
 
     let mut bounds_lts = Vec::new();
-    let types = generics.params.iter().filter(|param| match param.kind {
+    let types = generics
-        GenericParamKind::Type { .. } => true,
+        .params
-        _ => false,
+        .iter()
-    });
+        .filter(|param| matches!(param.kind, GenericParamKind::Type { .. }));
     for typ in types {
         for bound in typ.bounds {
             let mut visitor = RefVisitor::new(cx);
@@ -337,10 +337,10 @@ impl<'a, 'tcx> RefVisitor<'a, 'tcx> {
     fn collect_anonymous_lifetimes(&mut self, qpath: &QPath<'_>, ty: &Ty<'_>) {
         if let Some(ref last_path_segment) = last_path_segment(qpath).args {
             if !last_path_segment.parenthesized
-                && !last_path_segment.args.iter().any(|arg| match arg {
+                && !last_path_segment
-                    GenericArg::Lifetime(_) => true,
+                    .args
-                    _ => false,
+                    .iter()
-                })
+                    .any(|arg| matches!(arg, GenericArg::Lifetime(_)))
             {
                 let hir_id = ty.hir_id;
                 match self.cx.qpath_res(qpath, hir_id) {

clippy_lints/src/loops.rs

@@ -2091,17 +2091,11 @@ fn var_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<HirId> {
 }
 
 fn is_loop(expr: &Expr<'_>) -> bool {
-    match expr.kind {
+    matches!(expr.kind, ExprKind::Loop(..))
-        ExprKind::Loop(..) => true,
-        _ => false,
-    }
 }
 
 fn is_conditional(expr: &Expr<'_>) -> bool {
-    match expr.kind {
+    matches!(expr.kind, ExprKind::Match(..))
-        ExprKind::Match(..) => true,
-        _ => false,
-    }
 }
 
 fn is_nested(cx: &LateContext<'_>, match_expr: &Expr<'_>, iter_expr: &Expr<'_>) -> bool {

clippy_lints/src/methods/mod.rs

@@ -1844,10 +1844,10 @@ fn lint_expect_fun_call(
                         ty::Ref(ty::ReStatic, ..)
                     )
                 }),
-            hir::ExprKind::Path(ref p) => match cx.qpath_res(p, arg.hir_id) {
+            hir::ExprKind::Path(ref p) => matches!(
-                hir::def::Res::Def(hir::def::DefKind::Const | hir::def::DefKind::Static, _) => true,
+                cx.qpath_res(p, arg.hir_id),
-                _ => false,
+                hir::def::Res::Def(hir::def::DefKind::Const | hir::def::DefKind::Static, _)
-            },
+            ),
             _ => false,
         }
     }
@@ -2028,13 +2028,7 @@ fn lint_clone_on_copy(cx: &LateContext<'_>, expr: &hir::Expr<'_>, arg: &hir::Exp
                     .tables()
                     .expr_adjustments(arg)
                     .iter()
-                    .filter(|adj| {
+                    .filter(|adj| matches!(adj.kind, ty::adjustment::Adjust::Deref(_)))
-                        if let ty::adjustment::Adjust::Deref(_) = adj.kind {
-                            true
-                        } else {
-                            false
-                        }
-                    })
                     .count();
                 let derefs: String = iter::repeat('*').take(deref_count).collect();
                 snip = Some(("try dereferencing it", format!("{}{}", derefs, snippet)));

clippy_lints/src/misc.rs

@@ -694,12 +694,7 @@ fn in_attributes_expansion(expr: &Expr<'_>) -> bool {
     use rustc_span::hygiene::MacroKind;
     if expr.span.from_expansion() {
         let data = expr.span.ctxt().outer_expn_data();
-
+        matches!(data.kind, ExpnKind::Macro(MacroKind::Attr, _))
-        if let ExpnKind::Macro(MacroKind::Attr, _) = data.kind {
-            true
-        } else {
-            false
-        }
     } else {
         false
     }

clippy_lints/src/misc_early.rs

@@ -641,28 +641,22 @@ fn check_unneeded_wildcard_pattern(cx: &EarlyContext<'_>, pat: &Pat) {
             );
         }
 
-        #[allow(clippy::trivially_copy_pass_by_ref)]
-        fn is_wild<P: std::ops::Deref<Target = Pat>>(pat: &&P) -> bool {
-            if let PatKind::Wild = pat.kind {
-                true
-            } else {
-                false
-            }
-        }
-
         if let Some(rest_index) = patterns.iter().position(|pat| pat.is_rest()) {
             if let Some((left_index, left_pat)) = patterns[..rest_index]
                 .iter()
                 .rev()
-                .take_while(is_wild)
+                .take_while(|pat| matches!(pat.kind, PatKind::Wild))
                 .enumerate()
                 .last()
             {
                 span_lint(cx, left_pat.span.until(patterns[rest_index].span), left_index == 0);
             }
 
-            if let Some((right_index, right_pat)) =
+            if let Some((right_index, right_pat)) = patterns[rest_index + 1..]
-                patterns[rest_index + 1..].iter().take_while(is_wild).enumerate().last()
+                .iter()
+                .take_while(|pat| matches!(pat.kind, PatKind::Wild))
+                .enumerate()
+                .last()
             {
                 span_lint(
                     cx,

clippy_lints/src/missing_inline.rs

@@ -71,10 +71,11 @@ fn check_missing_inline_attrs(cx: &LateContext<'_>, attrs: &[ast::Attribute], sp
 fn is_executable(cx: &LateContext<'_>) -> bool {
     use rustc_session::config::CrateType;
 
-    cx.tcx.sess.crate_types().iter().any(|t: &CrateType| match t {
+    cx.tcx
-        CrateType::Executable => true,
+        .sess
-        _ => false,
+        .crate_types()
-    })
+        .iter()
+        .any(|t: &CrateType| matches!(t, CrateType::Executable))
 }
 
 declare_lint_pass!(MissingInline => [MISSING_INLINE_IN_PUBLIC_ITEMS]);

clippy_lints/src/new_without_default.rs

@@ -80,10 +80,12 @@ impl<'tcx> LateLintPass<'tcx> for NewWithoutDefault {
                             // can't be implemented for unsafe new
                             return;
                         }
-                        if impl_item.generics.params.iter().any(|gen| match gen.kind {
+                        if impl_item
-                            hir::GenericParamKind::Type { .. } => true,
+                            .generics
-                            _ => false,
+                            .params
-                        }) {
+                            .iter()
+                            .any(|gen| matches!(gen.kind, hir::GenericParamKind::Type { .. }))
+                        {
                             // when the result of `new()` depends on a type parameter we should not require
                             // an
                             // impl of `Default`

clippy_lints/src/non_copy_const.rs

@@ -238,10 +238,10 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
 
             let ty = if needs_check_adjustment {
                 let adjustments = cx.tables().expr_adjustments(dereferenced_expr);
-                if let Some(i) = adjustments.iter().position(|adj| match adj.kind {
+                if let Some(i) = adjustments
-                    Adjust::Borrow(_) | Adjust::Deref(_) => true,
+                    .iter()
-                    _ => false,
+                    .position(|adj| matches!(adj.kind, Adjust::Borrow(_) | Adjust::Deref(_)))
-                }) {
+                {
                     if i == 0 {
                         cx.tables().expr_ty(dereferenced_expr)
                     } else {

clippy_lints/src/precedence.rs

@@ -148,17 +148,11 @@ fn is_arith_expr(expr: &Expr) -> bool {
 #[must_use]
 fn is_bit_op(op: BinOpKind) -> bool {
     use rustc_ast::ast::BinOpKind::{BitAnd, BitOr, BitXor, Shl, Shr};
-    match op {
+    matches!(op, BitXor | BitAnd | BitOr | Shl | Shr)
-        BitXor | BitAnd | BitOr | Shl | Shr => true,
-        _ => false,
-    }
 }
 
 #[must_use]
 fn is_arith_op(op: BinOpKind) -> bool {
     use rustc_ast::ast::BinOpKind::{Add, Div, Mul, Rem, Sub};
-    match op {
+    matches!(op, Add | Sub | Mul | Div | Rem)
-        Add | Sub | Mul | Div | Rem => true,
-        _ => false,
-    }
 }

clippy_lints/src/regex.rs

@@ -99,12 +99,7 @@ fn is_trivial_regex(s: &regex_syntax::hir::Hir) -> Option<&'static str> {
     use regex_syntax::hir::Anchor::{EndText, StartText};
     use regex_syntax::hir::HirKind::{Alternation, Anchor, Concat, Empty, Literal};
 
-    let is_literal = |e: &[regex_syntax::hir::Hir]| {
+    let is_literal = |e: &[regex_syntax::hir::Hir]| e.iter().all(|e| matches!(*e.kind(), Literal(_)));
-        e.iter().all(|e| match *e.kind() {
-            Literal(_) => true,
-            _ => false,
-        })
-    };
 
     match *s.kind() {
         Empty | Anchor(_) => Some("the regex is unlikely to be useful as it is"),

clippy_lints/src/shadow.rs

@@ -165,10 +165,7 @@ fn check_local<'tcx>(cx: &LateContext<'tcx>, local: &'tcx Local<'_>, bindings: &
 
 fn is_binding(cx: &LateContext<'_>, pat_id: HirId) -> bool {
     let var_ty = cx.tables().node_type_opt(pat_id);
-    var_ty.map_or(false, |var_ty| match var_ty.kind {
+    var_ty.map_or(false, |var_ty| !matches!(var_ty.kind, ty::Adt(..)))
-        ty::Adt(..) => false,
-        _ => true,
-    })
 }
 
 fn check_pat<'tcx>(

clippy_lints/src/temporary_assignment.rs

@@ -25,13 +25,7 @@ declare_clippy_lint! {
 fn is_temporary(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     match &expr.kind {
         ExprKind::Struct(..) | ExprKind::Tup(..) => true,
-        ExprKind::Path(qpath) => {
+        ExprKind::Path(qpath) => matches!(cx.qpath_res(qpath, expr.hir_id), Res::Def(DefKind::Const, ..)),
-            if let Res::Def(DefKind::Const, ..) = cx.qpath_res(qpath, expr.hir_id) {
-                true
-            } else {
-                false
-            }
-        },
         _ => false,
     }
 }

clippy_lints/src/types.rs

@@ -775,11 +775,7 @@ impl<'tcx> LateLintPass<'tcx> for UnitArg {
                     .iter()
                     .filter(|arg| {
                         if is_unit(cx.tables().expr_ty(arg)) && !is_unit_literal(arg) {
-                            if let ExprKind::Match(.., MatchSource::TryDesugar) = &arg.kind {
+                            !matches!(&arg.kind, ExprKind::Match(.., MatchSource::TryDesugar))
-                                false
-                            } else {
-                                true
-                            }
                         } else {
                             false
                         }
@@ -899,17 +895,11 @@ fn is_questionmark_desugar_marked_call(expr: &Expr<'_>) -> bool {
 }
 
 fn is_unit(ty: Ty<'_>) -> bool {
-    match ty.kind {
+    matches!(ty.kind, ty::Tuple(slice) if slice.is_empty())
-        ty::Tuple(slice) if slice.is_empty() => true,
-        _ => false,
-    }
 }
 
 fn is_unit_literal(expr: &Expr<'_>) -> bool {
-    match expr.kind {
+    matches!(expr.kind, ExprKind::Tup(ref slice) if slice.is_empty())
-        ExprKind::Tup(ref slice) if slice.is_empty() => true,
-        _ => false,
-    }
 }
 
 declare_clippy_lint! {
@@ -1154,10 +1144,7 @@ fn int_ty_to_nbits(typ: Ty<'_>, tcx: TyCtxt<'_>) -> u64 {
 }
 
 fn is_isize_or_usize(typ: Ty<'_>) -> bool {
-    match typ.kind {
+    matches!(typ.kind, ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize))
-        ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize) => true,
-        _ => false,
-    }
 }
 
 fn span_precision_loss_lint(cx: &LateContext<'_>, expr: &Expr<'_>, cast_from: Ty<'_>, cast_to_f64: bool) {
@@ -1737,10 +1724,10 @@ impl<'tcx> Visitor<'tcx> for TypeComplexityVisitor {
 
             TyKind::TraitObject(ref param_bounds, _) => {
                 let has_lifetime_parameters = param_bounds.iter().any(|bound| {
-                    bound.bound_generic_params.iter().any(|gen| match gen.kind {
+                    bound
-                        GenericParamKind::Lifetime { .. } => true,
+                        .bound_generic_params
-                        _ => false,
+                        .iter()
-                    })
+                        .any(|gen| matches!(gen.kind, GenericParamKind::Lifetime { .. }))
                 });
                 if has_lifetime_parameters {
                     // complex trait bounds like A<'a, 'b>

clippy_lints/src/unnamed_address.rs

@@ -58,10 +58,10 @@ declare_lint_pass!(UnnamedAddress => [FN_ADDRESS_COMPARISONS, VTABLE_ADDRESS_COM
 impl LateLintPass<'_> for UnnamedAddress {
     fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
         fn is_comparison(binop: BinOpKind) -> bool {
-            match binop {
+            matches!(
-                BinOpKind::Eq | BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ne | BinOpKind::Ge | BinOpKind::Gt => true,
+                binop,
-                _ => false,
+                BinOpKind::Eq | BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ne | BinOpKind::Ge | BinOpKind::Gt
-            }
+            )
         }
 
         fn is_trait_ptr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
@@ -72,11 +72,7 @@ impl LateLintPass<'_> for UnnamedAddress {
         }
 
         fn is_fn_def(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
-            if let ty::FnDef(..) = cx.tables().expr_ty(expr).kind {
+            matches!(cx.tables().expr_ty(expr).kind, ty::FnDef(..))
-                true
-            } else {
-                false
-            }
         }
 
         if_chain! {

clippy_lints/src/use_self.rs

@@ -169,10 +169,8 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
                 let parameters = &item_path.segments.last().expect(SEGMENTS_MSG).args;
                 let should_check = parameters.as_ref().map_or(
                     true,
-                    |params| !params.parenthesized && !params.args.iter().any(|arg| match arg {
+                    |params| !params.parenthesized
-                        GenericArg::Lifetime(_) => true,
+                        &&!params.args.iter().any(|arg| matches!(arg, GenericArg::Lifetime(_)))
-                        _ => false,
-                    })
                 );
 
                 if should_check {

clippy_lints/src/utils/ast_utils.rs

@@ -387,10 +387,7 @@ pub fn eq_use_tree_kind(l: &UseTreeKind, r: &UseTreeKind) -> bool {
 }
 
 pub fn eq_defaultness(l: Defaultness, r: Defaultness) -> bool {
-    match (l, r) {
+    matches!((l, r), (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_)))
-        (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_)) => true,
-        _ => false,
-    }
 }
 
 pub fn eq_vis(l: &Visibility, r: &Visibility) -> bool {

clippy_lints/src/utils/mod.rs

@@ -102,11 +102,7 @@ pub fn in_constant(cx: &LateContext<'_>, id: HirId) -> bool {
 #[must_use]
 pub fn in_macro(span: Span) -> bool {
     if span.from_expansion() {
-        if let ExpnKind::Desugaring(..) = span.ctxt().outer_expn_data().kind {
+        !matches!(span.ctxt().outer_expn_data().kind, ExpnKind::Desugaring(..))
-            false
-        } else {
-            true
-        }
     } else {
         false
     }
@@ -127,10 +123,7 @@ pub fn is_present_in_source<T: LintContext>(cx: &T, span: Span) -> bool {
 
 /// Checks if given pattern is a wildcard (`_`)
 pub fn is_wild<'tcx>(pat: &impl std::ops::Deref<Target = Pat<'tcx>>) -> bool {
-    match pat.kind {
+    matches!(pat.kind, PatKind::Wild)
-        PatKind::Wild => true,
-        _ => false,
-    }
 }
 
 /// Checks if type is struct, enum or union type with the given def path.

clippy_lints/src/utils/numeric_literal.rs

@@ -51,7 +51,7 @@ impl<'a> NumericLiteral<'a> {
     pub fn from_lit_kind(src: &'a str, lit_kind: &LitKind) -> Option<NumericLiteral<'a>> {
         if lit_kind.is_numeric() && src.chars().next().map_or(false, |c| c.is_digit(10)) {
             let (unsuffixed, suffix) = split_suffix(&src, lit_kind);
-            let float = if let LitKind::Float(..) = lit_kind { true } else { false };
+            let float = matches!(lit_kind, LitKind::Float(..));
             Some(NumericLiteral::new(unsuffixed, suffix, float))
         } else {
             None

src/driver.rs

@@ -382,13 +382,8 @@ pub fn main() {
 
         let should_describe_lints = || {
             let args: Vec<_> = env::args().collect();
-            args.windows(2).any(|args| {
+            args.windows(2)
-                args[1] == "help"
+                .any(|args| args[1] == "help" && matches!(args[0].as_str(), "-W" | "-A" | "-D" | "-F"))
-                    && match args[0].as_str() {
-                        "-W" | "-A" | "-D" | "-F" => true,
-                        _ => false,
-                    }
-            })
         };
 
         if !wrapper_mode && should_describe_lints() {