Factor out eq_ty_kind

clippy_lints/src/methods/mod.rs

@@ -62,13 +62,11 @@
 use bind_instead_of_map::BindInsteadOfMap;
 use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
 use clippy_utils::ty::{contains_ty, implements_trait, is_copy, is_type_diagnostic_item};
-use clippy_utils::{
+use clippy_utils::{contains_return, get_trait_def_id, in_macro, iter_input_pats, method_calls, paths, return_ty};
-    contains_return, get_trait_def_id, in_macro, iter_input_pats, match_qpath, method_calls, paths, return_ty,
-    SpanlessEq,
-};
 use if_chain::if_chain;
 use rustc_hir as hir;
-use rustc_hir::{TraitItem, TraitItemKind};
+use rustc_hir::def::Res;
+use rustc_hir::{PrimTy, QPath, TraitItem, TraitItemKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::{self, TraitRef, Ty, TyS};
@@ -1872,7 +1870,7 @@ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::Impl
                     for method_config in &TRAIT_METHODS {
                         if name == method_config.method_name &&
                             sig.decl.inputs.len() == method_config.param_count &&
-                            method_config.output_type.matches(cx, &sig.decl.output) &&
+                            method_config.output_type.matches(&sig.decl.output) &&
                             method_config.self_kind.matches(cx, self_ty, first_arg_ty) &&
                             fn_header_equals(method_config.fn_header, sig.header) &&
                             method_config.lifetime_param_cond(&impl_item)
@@ -2199,8 +2197,8 @@ enum OutType {
 }
 
 impl OutType {
-    fn matches(self, cx: &LateContext<'_>, ty: &hir::FnRetTy<'_>) -> bool {
+    fn matches(self, ty: &hir::FnRetTy<'_>) -> bool {
-        let is_unit = |ty: &hir::Ty<'_>| SpanlessEq::new(cx).eq_ty_kind(&ty.kind, &hir::TyKind::Tup(&[]));
+        let is_unit = |ty: &hir::Ty<'_>| matches!(ty.kind, hir::TyKind::Tup(&[]));
         match (self, ty) {
             (Self::Unit, &hir::FnRetTy::DefaultReturn(_)) => true,
             (Self::Unit, &hir::FnRetTy::Return(ref ty)) if is_unit(ty) => true,
@@ -2213,8 +2211,8 @@ fn matches(self, cx: &LateContext<'_>, ty: &hir::FnRetTy<'_>) -> bool {
 }
 
 fn is_bool(ty: &hir::Ty<'_>) -> bool {
-    if let hir::TyKind::Path(ref p) = ty.kind {
+    if let hir::TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
-        match_qpath(p, &["bool"])
+        matches!(path.res, Res::PrimTy(PrimTy::Bool))
     } else {
         false
     }

clippy_utils/src/hir_utils.rs

@@ -80,10 +80,6 @@ pub fn eq_path_segment(&mut self, left: &PathSegment<'_>, right: &PathSegment<'_
     pub fn eq_path_segments(&mut self, left: &[PathSegment<'_>], right: &[PathSegment<'_>]) -> bool {
         self.inter_expr().eq_path_segments(left, right)
     }
-
-    pub fn eq_ty_kind(&mut self, left: &TyKind<'_>, right: &TyKind<'_>) -> bool {
-        self.inter_expr().eq_ty_kind(left, right)
-    }
 }
 
 struct HirEqInterExpr<'a, 'b, 'tcx> {
@@ -378,13 +374,9 @@ pub fn eq_path_segment(&mut self, left: &PathSegment<'_>, right: &PathSegment<'_
         left.ident.name == right.ident.name && both(&left.args, &right.args, |l, r| self.eq_path_parameters(l, r))
     }
 
-    fn eq_ty(&mut self, left: &Ty<'_>, right: &Ty<'_>) -> bool {
-        self.eq_ty_kind(&left.kind, &right.kind)
-    }
-
     #[allow(clippy::similar_names)]
-    fn eq_ty_kind(&mut self, left: &TyKind<'_>, right: &TyKind<'_>) -> bool {
+    fn eq_ty(&mut self, left: &Ty<'_>, right: &Ty<'_>) -> bool {
-        match (left, right) {
+        match (&left.kind, &right.kind) {
             (&TyKind::Slice(ref l_vec), &TyKind::Slice(ref r_vec)) => self.eq_ty(l_vec, r_vec),
             (&TyKind::Array(ref lt, ref ll_id), &TyKind::Array(ref rt, ref rl_id)) => {
                 let cx = self.inner.cx;