fix: unnecessary_cast suggests extra brackets when in macro (#14643)

Closes rust-lang/rust-clippy#14640

changelog: [`unnecessary_cast`] fix extra brackets in suggestions when
in macro

tests/ui/unnecessary_cast.fixed

@@ -266,7 +266,21 @@ mod fixable {
     // Issue #11968: The suggestion for this lint removes the parentheses and leave the code as
     // `*x.pow(2)` which tries to dereference the return value rather than `x`.
     fn issue_11968(x: &usize) -> usize {
-        { *x }.pow(2)
+        (*x).pow(2)
+        //~^ unnecessary_cast
+    }
+
+    #[allow(clippy::cast_lossless)]
+    fn issue_14640() {
+        let x = 5usize;
+        let vec: Vec<u64> = vec![1, 2, 3, 4, 5];
+        assert_eq!(vec.len(), x);
+        //~^ unnecessary_cast
+
+        let _ = (5i32 as i64).abs();
+        //~^ unnecessary_cast
+
+        let _ = 5i32 as i64;
         //~^ unnecessary_cast
     }
 }

tests/ui/unnecessary_cast.rs

@@ -269,4 +269,18 @@ mod fixable {
         (*x as usize).pow(2)
         //~^ unnecessary_cast
     }
+
+    #[allow(clippy::cast_lossless)]
+    fn issue_14640() {
+        let x = 5usize;
+        let vec: Vec<u64> = vec![1, 2, 3, 4, 5];
+        assert_eq!(vec.len(), x as usize);
+        //~^ unnecessary_cast
+
+        let _ = (5i32 as i64 as i64).abs();
+        //~^ unnecessary_cast
+
+        let _ = 5i32 as i64 as i64;
+        //~^ unnecessary_cast
+    }
 }

tests/ui/unnecessary_cast.stderr

@@ -245,7 +245,25 @@ error: casting to the same type is unnecessary (`usize` -> `usize`)
   --> tests/ui/unnecessary_cast.rs:269:9
    |
 LL |         (*x as usize).pow(2)
-   |         ^^^^^^^^^^^^^ help: try: `{ *x }`
+   |         ^^^^^^^^^^^^^ help: try: `(*x)`
 
-error: aborting due to 41 previous errors
+error: casting to the same type is unnecessary (`usize` -> `usize`)
+  --> tests/ui/unnecessary_cast.rs:277:31
+   |
+LL |         assert_eq!(vec.len(), x as usize);
+   |                               ^^^^^^^^^^ help: try: `x`
+
+error: casting to the same type is unnecessary (`i64` -> `i64`)
+  --> tests/ui/unnecessary_cast.rs:280:17
+   |
+LL |         let _ = (5i32 as i64 as i64).abs();
+   |                 ^^^^^^^^^^^^^^^^^^^^ help: try: `(5i32 as i64)`
+
+error: casting to the same type is unnecessary (`i64` -> `i64`)
+  --> tests/ui/unnecessary_cast.rs:283:17
+   |
+LL |         let _ = 5i32 as i64 as i64;
+   |                 ^^^^^^^^^^^^^^^^^^ help: try: `5i32 as i64`
+
+error: aborting due to 44 previous errors