- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+0:11: +0:11
      let mut _1: (i32, i32);              // in scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+1:9: +1:14
      scope 1 {
          debug x => _1;                   // in scope 1 at $DIR/mutable_variable_aggregate_mut_ref.rs:+1:9: +1:14
          let _2: &mut (i32, i32);         // in scope 1 at $DIR/mutable_variable_aggregate_mut_ref.rs:+2:9: +2:10
          scope 2 {
              debug z => _2;               // in scope 2 at $DIR/mutable_variable_aggregate_mut_ref.rs:+2:9: +2:10
              let _3: (i32, i32);          // in scope 2 at $DIR/mutable_variable_aggregate_mut_ref.rs:+4:9: +4:10
              scope 3 {
                  debug y => _3;           // in scope 3 at $DIR/mutable_variable_aggregate_mut_ref.rs:+4:9: +4:10
              }
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+1:9: +1:14
          Deinit(_1);                      // scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+1:17: +1:25
          (_1.0: i32) = const 42_i32;      // scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+1:17: +1:25
          (_1.1: i32) = const 43_i32;      // scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+1:17: +1:25
          StorageLive(_2);                 // scope 1 at $DIR/mutable_variable_aggregate_mut_ref.rs:+2:9: +2:10
          _2 = &mut _1;                    // scope 1 at $DIR/mutable_variable_aggregate_mut_ref.rs:+2:13: +2:19
          ((*_2).1: i32) = const 99_i32;   // scope 2 at $DIR/mutable_variable_aggregate_mut_ref.rs:+3:5: +3:13
          StorageLive(_3);                 // scope 2 at $DIR/mutable_variable_aggregate_mut_ref.rs:+4:9: +4:10
          _3 = _1;                         // scope 2 at $DIR/mutable_variable_aggregate_mut_ref.rs:+4:13: +4:14
          StorageDead(_3);                 // scope 2 at $DIR/mutable_variable_aggregate_mut_ref.rs:+5:1: +5:2
          StorageDead(_2);                 // scope 1 at $DIR/mutable_variable_aggregate_mut_ref.rs:+5:1: +5:2
          StorageDead(_1);                 // scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+5:1: +5:2
          return;                          // scope 0 at $DIR/mutable_variable_aggregate_mut_ref.rs:+5:2: +5:2
      }
  }