- // MIR for `opt` before InstSimplify
+ // MIR for `opt` after InstSimplify
  
  fn opt(_1: bool) -> i32 {
      debug x => _1;
      let mut _0: i32;
      let mut _2: bool;
      let mut _3: bool;
  
      bb0: {
          StorageLive(_2);
          StorageLive(_3);
          _3 = _1;
-         _2 = Eq(move _3, const true);
+         _2 = move _3;
          switchInt(move _2) -> [0: bb2, otherwise: bb1];
      }
  
      bb1: {
          StorageDead(_3);
          _0 = const 0_i32;
          goto -> bb3;
      }
  
      bb2: {
          StorageDead(_3);
          _0 = const 1_i32;
          goto -> bb3;
      }
  
      bb3: {
          StorageDead(_2);
          return;
      }
  }