- // MIR for `main` before DataflowConstProp
+ // MIR for `main` after DataflowConstProp
  
  fn main() -> () {
      let mut _0: ();
      let mut _1: i32;
      let _2: ();
      let mut _3: &i32;
      let _4: &i32;
      let _5: ();
      scope 1 {
          debug a => _1;
          let _6: i32;
          scope 2 {
              debug b => _6;
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = const 0_i32;
          StorageLive(_2);
          StorageLive(_3);
          StorageLive(_4);
          _4 = &_1;
          _3 = &(*_4);
          _2 = escape::<i32>(move _3) -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
          StorageDead(_3);
          StorageDead(_4);
          StorageDead(_2);
          _1 = const 1_i32;
          StorageLive(_5);
          _5 = some_function() -> [return: bb2, unwind unreachable];
      }
  
      bb2: {
          StorageDead(_5);
          StorageLive(_6);
          _6 = copy _1;
          _0 = const ();
          StorageDead(_6);
          StorageDead(_1);
          return;
      }
  }