diff --git a/clippy_lints/src/eta_reduction.rs b/clippy_lints/src/eta_reduction.rs
index 2b68277ac366..30436716ff95 100644
--- a/clippy_lints/src/eta_reduction.rs
+++ b/clippy_lints/src/eta_reduction.rs
@@ -147,7 +147,7 @@ fn get_ufcs_type_name(
     })
 }
 
-fn match_borrow_depth(lhs: &ty::Ty<'_>, rhs: &ty::Ty<'_>) -> bool {
+fn match_borrow_depth(lhs: ty::Ty<'_>, rhs: ty::Ty<'_>) -> bool {
     match (&lhs.sty, &rhs.sty) {
         (ty::Ref(_, t1, _), ty::Ref(_, t2, _)) => match_borrow_depth(&t1, &t2),
         (l, r) => match (l, r) {
@@ -157,7 +157,7 @@ fn match_borrow_depth(lhs: &ty::Ty<'_>, rhs: &ty::Ty<'_>) -> bool {
     }
 }
 
-fn match_types(lhs: &ty::Ty<'_>, rhs: &ty::Ty<'_>) -> bool {
+fn match_types(lhs: ty::Ty<'_>, rhs: ty::Ty<'_>) -> bool {
     match (&lhs.sty, &rhs.sty) {
         (ty::Bool, ty::Bool)
         | (ty::Char, ty::Char)
@@ -172,7 +172,7 @@ fn match_types(lhs: &ty::Ty<'_>, rhs: &ty::Ty<'_>) -> bool {
     }
 }
 
-fn get_type_name(cx: &LateContext<'_, '_>, ty: &ty::Ty<'_>) -> String {
+fn get_type_name(cx: &LateContext<'_, '_>, ty: ty::Ty<'_>) -> String {
     match ty.sty {
         ty::Adt(t, _) => cx.tcx.def_path_str(t.did),
         ty::Ref(_, r, _) => get_type_name(cx, &r),
diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index 0b2e47fc86a2..c91065e5c1c8 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -104,6 +104,7 @@ pub struct AbsolutePathPrinter<'a, 'tcx> {
 
 use rustc::ty::print::Printer;
 
+#[allow(clippy::diverging_sub_expression)]
 impl<'tcx> Printer<'tcx, 'tcx> for AbsolutePathPrinter<'_, 'tcx> {
     type Error = !;