- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/mutable_variable.rs:+0:11: +0:11
      let mut _1: i32;                     // in scope 0 at $DIR/mutable_variable.rs:+1:9: +1:14
      scope 1 {
          debug x => _1;                   // in scope 1 at $DIR/mutable_variable.rs:+1:9: +1:14
          let _2: i32;                     // in scope 1 at $DIR/mutable_variable.rs:+3:9: +3:10
          scope 2 {
              debug y => _2;               // in scope 2 at $DIR/mutable_variable.rs:+3:9: +3:10
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/mutable_variable.rs:+1:9: +1:14
          _1 = const 42_i32;               // scope 0 at $DIR/mutable_variable.rs:+1:17: +1:19
          _1 = const 99_i32;               // scope 1 at $DIR/mutable_variable.rs:+2:5: +2:11
          StorageLive(_2);                 // scope 1 at $DIR/mutable_variable.rs:+3:9: +3:10
-         _2 = _1;                         // scope 1 at $DIR/mutable_variable.rs:+3:13: +3:14
+         _2 = const 99_i32;               // scope 1 at $DIR/mutable_variable.rs:+3:13: +3:14
          StorageDead(_2);                 // scope 1 at $DIR/mutable_variable.rs:+4:1: +4:2
          StorageDead(_1);                 // scope 0 at $DIR/mutable_variable.rs:+4:1: +4:2
          return;                          // scope 0 at $DIR/mutable_variable.rs:+4:2: +4:2
      }
  }