- // MIR for `main` before DataflowConstProp
+ // MIR for `main` after DataflowConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/self_assign.rs:+0:11: +0:11
      let mut _1: i32;                     // in scope 0 at $DIR/self_assign.rs:+1:9: +1:14
      let mut _2: i32;                     // in scope 0 at $DIR/self_assign.rs:+2:9: +2:10
      let mut _3: i32;                     // in scope 0 at $DIR/self_assign.rs:+3:9: +3:10
      let mut _5: &i32;                    // in scope 0 at $DIR/self_assign.rs:+6:9: +6:10
      let mut _6: i32;                     // in scope 0 at $DIR/self_assign.rs:+7:9: +7:11
      scope 1 {
          debug a => _1;                   // in scope 1 at $DIR/self_assign.rs:+1:9: +1:14
          let mut _4: &i32;                // in scope 1 at $DIR/self_assign.rs:+5:9: +5:14
          scope 2 {
              debug b => _4;               // in scope 2 at $DIR/self_assign.rs:+5:9: +5:14
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/self_assign.rs:+1:9: +1:14
          _1 = const 0_i32;                // scope 0 at $DIR/self_assign.rs:+1:17: +1:18
          StorageLive(_2);                 // scope 1 at $DIR/self_assign.rs:+2:9: +2:10
          _2 = _1;                         // scope 1 at $DIR/self_assign.rs:+2:9: +2:10
          _1 = Add(move _2, const 1_i32);  // scope 1 at $DIR/self_assign.rs:+2:5: +2:14
          StorageDead(_2);                 // scope 1 at $DIR/self_assign.rs:+2:13: +2:14
          StorageLive(_3);                 // scope 1 at $DIR/self_assign.rs:+3:9: +3:10
          _3 = _1;                         // scope 1 at $DIR/self_assign.rs:+3:9: +3:10
          _1 = move _3;                    // scope 1 at $DIR/self_assign.rs:+3:5: +3:10
          StorageDead(_3);                 // scope 1 at $DIR/self_assign.rs:+3:9: +3:10
          StorageLive(_4);                 // scope 1 at $DIR/self_assign.rs:+5:9: +5:14
          _4 = &_1;                        // scope 1 at $DIR/self_assign.rs:+5:17: +5:19
          StorageLive(_5);                 // scope 2 at $DIR/self_assign.rs:+6:9: +6:10
          _5 = _4;                         // scope 2 at $DIR/self_assign.rs:+6:9: +6:10
          _4 = move _5;                    // scope 2 at $DIR/self_assign.rs:+6:5: +6:10
          StorageDead(_5);                 // scope 2 at $DIR/self_assign.rs:+6:9: +6:10
          StorageLive(_6);                 // scope 2 at $DIR/self_assign.rs:+7:9: +7:11
          _6 = (*_4);                      // scope 2 at $DIR/self_assign.rs:+7:9: +7:11
          _1 = move _6;                    // scope 2 at $DIR/self_assign.rs:+7:5: +7:11
          StorageDead(_6);                 // scope 2 at $DIR/self_assign.rs:+7:10: +7:11
          _0 = const ();                   // scope 0 at $DIR/self_assign.rs:+0:11: +8:2
          StorageDead(_4);                 // scope 1 at $DIR/self_assign.rs:+8:1: +8:2
          StorageDead(_1);                 // scope 0 at $DIR/self_assign.rs:+8:1: +8:2
          return;                          // scope 0 at $DIR/self_assign.rs:+8:2: +8:2
      }
  }