playing with the mutable references

src/main.rs

@@ -9,8 +9,13 @@ fn main() {
     println!("t 2nd: {}", t.1);
 
     let mut x: i32 = 10; 
+    let mut z: i32 = 5; 
     println!("x: {x}");
-    let ref_x: &mut i32 = &mut x;
+    println!("z: {z}");
+    let mut ref_x: &mut i32 = &mut x;
     *ref_x = 20; 
     println!("x: {x}");
+    ref_x = &mut z;
+    *ref_x = 20; 
+    println!("z: {z}");
 }