- // MIR for `main` before DataflowConstProp
+ // MIR for `main` after DataflowConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/cast.rs:+0:11: +0:11
      let _1: i32;                         // in scope 0 at $DIR/cast.rs:+1:9: +1:10
      let mut _3: u8;                      // in scope 0 at $DIR/cast.rs:+2:13: +2:20
      let mut _4: i32;                     // in scope 0 at $DIR/cast.rs:+2:13: +2:14
      scope 1 {
          debug a => _1;                   // in scope 1 at $DIR/cast.rs:+1:9: +1:10
          let _2: u8;                      // in scope 1 at $DIR/cast.rs:+2:9: +2:10
          scope 2 {
              debug b => _2;               // in scope 2 at $DIR/cast.rs:+2:9: +2:10
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/cast.rs:+1:9: +1:10
          _1 = const 257_i32;              // scope 0 at $DIR/cast.rs:+1:13: +1:16
          StorageLive(_2);                 // scope 1 at $DIR/cast.rs:+2:9: +2:10
          StorageLive(_3);                 // scope 1 at $DIR/cast.rs:+2:13: +2:20
          StorageLive(_4);                 // scope 1 at $DIR/cast.rs:+2:13: +2:14
-         _4 = _1;                         // scope 1 at $DIR/cast.rs:+2:13: +2:14
-         _3 = move _4 as u8 (IntToInt);   // scope 1 at $DIR/cast.rs:+2:13: +2:20
+         _4 = const 257_i32;              // scope 1 at $DIR/cast.rs:+2:13: +2:14
+         _3 = const 1_u8;                 // scope 1 at $DIR/cast.rs:+2:13: +2:20
          StorageDead(_4);                 // scope 1 at $DIR/cast.rs:+2:19: +2:20
-         _2 = Add(move _3, const 1_u8);   // scope 1 at $DIR/cast.rs:+2:13: +2:24
+         _2 = const 2_u8;                 // scope 1 at $DIR/cast.rs:+2:13: +2:24
          StorageDead(_3);                 // scope 1 at $DIR/cast.rs:+2:23: +2:24
          _0 = const ();                   // scope 0 at $DIR/cast.rs:+0:11: +3:2
          StorageDead(_2);                 // scope 1 at $DIR/cast.rs:+3:1: +3:2
          StorageDead(_1);                 // scope 0 at $DIR/cast.rs:+3:1: +3:2
          return;                          // scope 0 at $DIR/cast.rs:+3:2: +3:2
      }
  }