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- // MIR for `main` before DataflowConstProp
+ // MIR for `main` after DataflowConstProp
  
  fn main() -> () {
      let mut _0: ();
      let mut _1: S;
      let mut _3: i32;
      let mut _5: i32;
      let mut _6: i32;
      scope 1 {
          debug s => _1;
          let _2: i32;
          scope 2 {
              debug a => _2;
              let _4: i32;
              scope 3 {
                  debug b => _4;
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = S(const 1_i32);
          StorageLive(_2);
          StorageLive(_3);
-         _3 = (_1.0: i32);
-         _2 = Add(move _3, const 2_i32);
+         _3 = const 1_i32;
+         _2 = const 3_i32;
          StorageDead(_3);
          (_1.0: i32) = const 3_i32;
          StorageLive(_4);
          StorageLive(_5);
-         _5 = _2;
+         _5 = const 3_i32;
          StorageLive(_6);
-         _6 = (_1.0: i32);
-         _4 = Add(move _5, move _6);
+         _6 = const 3_i32;
+         _4 = const 6_i32;
          StorageDead(_6);
          StorageDead(_5);
          _0 = const ();
          StorageDead(_4);
          StorageDead(_2);
          StorageDead(_1);
          return;
      }
  }