- // 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 _10: SmallStruct;
      let mut _14: &&SmallStruct;
      let mut _16: f32;
      let mut _17: std::option::Option<S>;
      let mut _18: &[f32];
      let mut _22: BigStruct;
      let mut _26: &&BigStruct;
      let mut _28: f32;
      let mut _29: std::option::Option<S>;
      let mut _30: &[f32];
      let mut _31: &SmallStruct;
      let mut _32: &SmallStruct;
      let mut _33: &SmallStruct;
      let mut _34: &SmallStruct;
      let mut _35: &BigStruct;
      let mut _36: &BigStruct;
      let mut _37: &BigStruct;
      let mut _38: &BigStruct;
      scope 1 {
          debug s => _1;
          let _2: i32;
          scope 2 {
              debug a => _2;
              let _4: i32;
              scope 3 {
                  debug b => _4;
                  let _7: f32;
                  let _8: std::option::Option<S>;
                  let _9: &[f32];
                  scope 4 {
                      debug a1 => _7;
                      debug b1 => _8;
                      debug c1 => _9;
                      let _11: f32;
                      let _12: std::option::Option<S>;
                      let _13: &[f32];
                      scope 5 {
                          debug a2 => _11;
                          debug b2 => _12;
                          debug c2 => _13;
                          let _15: SmallStruct;
                          scope 6 {
                              debug ss => _15;
                              let _19: f32;
                              let _20: std::option::Option<S>;
                              let _21: &[f32];
                              scope 7 {
                                  debug a3 => _19;
                                  debug b3 => _20;
                                  debug c3 => _21;
                                  let _23: f32;
                                  let _24: std::option::Option<S>;
                                  let _25: &[f32];
                                  scope 8 {
                                      debug a4 => _23;
                                      debug b4 => _24;
                                      debug c4 => _25;
                                      let _27: BigStruct;
                                      scope 9 {
                                          debug bs => _27;
                                      }
                                  }
                              }
                          }
                      }
                  }
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
-         _1 = S(const 1_i32);
+         _1 = const S(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(_10);
          _10 = const main::SMALL_VAL;
          StorageLive(_7);
-         _7 = (_10.0: f32);
+         _7 = const 4f32;
          StorageLive(_8);
-         _8 = (_10.1: std::option::Option<S>);
+         _8 = const Option::<S>::Some(S(1_i32));
          StorageLive(_9);
          _9 = (_10.2: &[f32]);
          StorageDead(_10);
          StorageLive(_14);
          _14 = const {ALLOC4: &&SmallStruct};
          _31 = deref_copy (*_14);
          StorageLive(_11);
          _32 = deref_copy (*_14);
-         _11 = ((*_32).0: f32);
+         _11 = const 9f32;
          StorageLive(_12);
          _33 = deref_copy (*_14);
          _12 = ((*_33).1: std::option::Option<S>);
          StorageLive(_13);
          _34 = deref_copy (*_14);
          _13 = ((*_34).2: &[f32]);
          StorageDead(_14);
          StorageLive(_15);
          StorageLive(_16);
-         _16 = _11;
+         _16 = const 9f32;
          StorageLive(_17);
          _17 = _12;
          StorageLive(_18);
          _18 = _13;
-         _15 = SmallStruct(move _16, move _17, move _18);
+         _15 = SmallStruct(const 9f32, move _17, move _18);
          StorageDead(_18);
          StorageDead(_17);
          StorageDead(_16);
          StorageLive(_22);
          _22 = const main::BIG_VAL;
          StorageLive(_19);
-         _19 = (_22.0: f32);
+         _19 = const 25f32;
          StorageLive(_20);
          _20 = (_22.1: std::option::Option<S>);
          StorageLive(_21);
          _21 = (_22.2: &[f32]);
          StorageDead(_22);
          StorageLive(_26);
          _26 = const {ALLOC5: &&BigStruct};
          _35 = deref_copy (*_26);
          StorageLive(_23);
          _36 = deref_copy (*_26);
-         _23 = ((*_36).0: f32);
+         _23 = const 82f32;
          StorageLive(_24);
          _37 = deref_copy (*_26);
-         _24 = ((*_37).1: std::option::Option<S>);
+         _24 = const Option::<S>::Some(S(35_i32));
          StorageLive(_25);
          _38 = deref_copy (*_26);
          _25 = ((*_38).2: &[f32]);
          StorageDead(_26);
          StorageLive(_27);
          StorageLive(_28);
-         _28 = _23;
+         _28 = const 82f32;
          StorageLive(_29);
-         _29 = _24;
+         _29 = const Option::<S>::Some(S(35_i32));
          StorageLive(_30);
          _30 = _25;
-         _27 = BigStruct(move _28, move _29, move _30);
+         _27 = BigStruct(const 82f32, const Option::<S>::Some(S(35_i32)), move _30);
          StorageDead(_30);
          StorageDead(_29);
          StorageDead(_28);
          _0 = const ();
          StorageDead(_27);
          StorageDead(_25);
          StorageDead(_24);
          StorageDead(_23);
          StorageDead(_21);
          StorageDead(_20);
          StorageDead(_19);
          StorageDead(_15);
          StorageDead(_13);
          StorageDead(_12);
          StorageDead(_11);
          StorageDead(_9);
          StorageDead(_8);
          StorageDead(_7);
          StorageDead(_4);
          StorageDead(_2);
          StorageDead(_1);
          return;
      }
+ }
+ 
+ ALLOC6 (size: 8, align: 4) {
+     01 00 00 00 23 00 00 00                         │ ....#...
+ }
+ 
+ ALLOC7 (size: 8, align: 4) {
+     01 00 00 00 23 00 00 00                         │ ....#...
+ }
+ 
+ ALLOC8 (size: 8, align: 4) {
+     01 00 00 00 23 00 00 00                         │ ....#...
+ }
+ 
+ ALLOC9 (size: 8, align: 4) {
+     01 00 00 00 01 00 00 00                         │ ........
+ }
+ 
+ ALLOC10 (size: 4, align: 4) {
+     01 00 00 00                                     │ ....
  }
  
  ALLOC5 (static: BIG_STAT, size: 4, align: 4) {
      ╾ALLOC0<imm>╼                                     │ ╾──╼
  }
  
  ALLOC0 (size: 20, align: 4) {
      0x00 │ 01 00 00 00 23 00 00 00 ╾ALLOC1<imm>╼ 02 00 00 00 │ ....#...╾──╼....
      0x10 │ 00 00 a4 42                                     │ ...B
  }
  
  ALLOC1 (size: 8, align: 4) {
      00 00 34 42 00 00 90 42                         │ ..4B...B
  }
  
  ALLOC4 (static: SMALL_STAT, size: 4, align: 4) {
      ╾ALLOC2<imm>╼                                     │ ╾──╼
  }
  
  ALLOC2 (size: 20, align: 4) {
      0x00 │ 00 00 00 00 __ __ __ __ ╾ALLOC3<imm>╼ 01 00 00 00 │ ....░░░░╾──╼....
      0x10 │ 00 00 10 41                                     │ ...A
  }
  
  ALLOC3 (size: 4, align: 4) {
      00 00 50 41                                     │ ..PA
  }