- // MIR for `mutable_ref` before JumpThreading
+ // MIR for `mutable_ref` after JumpThreading
  
  fn mutable_ref() -> bool {
      let mut _0: bool;
      let mut _1: i32;
      let _3: ();
      let mut _4: bool;
      let mut _5: i32;
      scope 1 {
          debug x => _1;
          let _2: *mut i32;
          scope 2 {
              debug a => _2;
              scope 3 {
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = const 5_i32;
          StorageLive(_2);
          _2 = &raw mut _1;
          _1 = const 7_i32;
          StorageLive(_3);
          (*_2) = const 8_i32;
          _3 = const ();
          StorageDead(_3);
          StorageLive(_4);
          StorageLive(_5);
          _5 = _1;
          _4 = Eq(move _5, const 7_i32);
          switchInt(move _4) -> [0: bb2, otherwise: bb1];
      }
  
      bb1: {
          StorageDead(_5);
          _0 = const true;
          goto -> bb3;
      }
  
      bb2: {
          StorageDead(_5);
          _0 = const false;
          goto -> bb3;
      }
  
      bb3: {
          StorageDead(_4);
          StorageDead(_2);
          StorageDead(_1);
          return;
      }
  }