Use operator overloading instead of direct calls of make_binop

Author: rail-rain

clippy_lints/src/loops.rs

@@ -875,7 +875,7 @@ impl std::ops::Sub for &MinifyingSugg<'static> {
     fn sub(self, rhs: &MinifyingSugg<'static>) -> MinifyingSugg<'static> {
         match (self.as_str(), rhs.as_str()) {
             (_, "0") => self.clone(),
-            ("0", _) => MinifyingSugg(sugg::make_unop("-", rhs.0.clone())),
+            ("0", _) => MinifyingSugg(-(rhs.0.clone())),
             (x, y) if x == y => MinifyingSugg::non_paren("0"),
             (_, _) => MinifyingSugg(&self.0 - &rhs.0),
         }
@@ -898,7 +898,7 @@ impl std::ops::Sub<&MinifyingSugg<'static>> for MinifyingSugg<'static> {
     fn sub(self, rhs: &MinifyingSugg<'static>) -> MinifyingSugg<'static> {
         match (self.as_str(), rhs.as_str()) {
             (_, "0") => self,
-            ("0", _) => MinifyingSugg(sugg::make_unop("-", rhs.0.clone())),
+            ("0", _) => MinifyingSugg(-(rhs.0.clone())),
             (x, y) if x == y => MinifyingSugg::non_paren("0"),
             (_, _) => MinifyingSugg(self.0 - &rhs.0),
         }

clippy_lints/src/utils/sugg.rs

@@ -13,7 +13,7 @@ use rustc_span::{BytePos, Pos};
 use std::borrow::Cow;
 use std::convert::TryInto;
 use std::fmt::Display;
-use std::ops::{Add, Not, Sub};
+use std::ops::{Add, Neg, Not, Sub};
 
 /// A helper type to build suggestion correctly handling parenthesis.
 pub enum Sugg<'a> {
@@ -354,6 +354,13 @@ impl Sub for &Sugg<'_> {
 forward_binop_impls_to_ref!(impl Add, add for Sugg<'_>, type Output = Sugg<'static>);
 forward_binop_impls_to_ref!(impl Sub, sub for Sugg<'_>, type Output = Sugg<'static>);
 
+impl Neg for Sugg<'_> {
+    type Output = Sugg<'static>;
+    fn neg(self) -> Sugg<'static> {
+        make_unop("-", self)
+    }
+}
+
 impl Not for Sugg<'_> {
     type Output = Sugg<'static>;
     fn not(self) -> Sugg<'static> {