- // 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;
      let mut _11: BigStruct;
      let mut _16: &&BigStruct;
      let mut _17: &BigStruct;
      let mut _18: &BigStruct;
      let mut _19: &BigStruct;
      let mut _20: &BigStruct;
      let mut _21: &BigStruct;
      scope 1 {
          debug s => _1;
          let _2: i32;
          scope 2 {
              debug a => _2;
              let _4: i32;
              scope 3 {
                  debug b => _4;
                  let _7: S;
                  let _8: u8;
                  let _9: f32;
                  let _10: S;
                  scope 4 {
                      debug a => _7;
                      debug b => _8;
                      debug c => _9;
                      debug d => _10;
                      let _12: S;
                      let _13: u8;
                      let _14: f32;
                      let _15: S;
                      scope 5 {
                          debug a => _12;
                          debug b => _13;
                          debug c => _14;
                          debug d => _15;
                      }
                  }
              }
          }
      }
  
      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);
          StorageLive(_11);
          _11 = const _;
          StorageLive(_7);
-         _7 = (_11.0: S);
+         _7 = const S(1_i32);
          StorageLive(_8);
-         _8 = (_11.1: u8);
+         _8 = const 5_u8;
          StorageLive(_9);
-         _9 = (_11.2: f32);
+         _9 = const 7f32;
          StorageLive(_10);
-         _10 = (_11.3: S);
+         _10 = const S(13_i32);
          StorageDead(_11);
          StorageLive(_16);
          _16 = const {alloc1: &&BigStruct};
          _17 = deref_copy (*_16);
          StorageLive(_12);
          _18 = deref_copy (*_16);
-         _12 = ((*_18).0: S);
+         _12 = const S(1_i32);
          StorageLive(_13);
          _19 = deref_copy (*_16);
-         _13 = ((*_19).1: u8);
+         _13 = const 5_u8;
          StorageLive(_14);
          _20 = deref_copy (*_16);
-         _14 = ((*_20).2: f32);
+         _14 = const 7f32;
          StorageLive(_15);
          _21 = deref_copy (*_16);
-         _15 = ((*_21).3: S);
+         _15 = const S(13_i32);
          StorageDead(_16);
          _0 = const ();
          StorageDead(_15);
          StorageDead(_14);
          StorageDead(_13);
          StorageDead(_12);
          StorageDead(_10);
          StorageDead(_9);
          StorageDead(_8);
          StorageDead(_7);
          StorageDead(_4);
          StorageDead(_2);
          StorageDead(_1);
          return;
      }
  }
  
  alloc1 (static: STAT, size: 4, align: 4) {
      ╾─alloc15─╼                                     │ ╾──╼
  }
  
  alloc15 (size: 16, align: 4) {
      01 00 00 00 00 00 e0 40 0d 00 00 00 05 __ __ __ │ .......@.....░░░
  }