- // MIR for `opt3` before InstCombine
+ // MIR for `opt3` after InstCombine
  
  fn opt3(_1: bool) -> u32 {
      debug x => _1;                       // in scope 0 at $DIR/bool_compare.rs:12:9: 12:10
      let mut _0: u32;                     // return place in scope 0 at $DIR/bool_compare.rs:12:21: 12:24
      let mut _2: bool;                    // in scope 0 at $DIR/bool_compare.rs:13:8: 13:18
      let mut _3: bool;                    // in scope 0 at $DIR/bool_compare.rs:13:8: 13:9
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $DIR/bool_compare.rs:13:8: 13:18
          StorageLive(_3);                 // scope 0 at $DIR/bool_compare.rs:13:8: 13:9
          _3 = _1;                         // scope 0 at $DIR/bool_compare.rs:13:8: 13:9
-         _2 = Eq(move _3, const false);   // scope 0 at $DIR/bool_compare.rs:13:8: 13:18
+         _2 = Not(move _3);               // scope 0 at $DIR/bool_compare.rs:13:8: 13:18
          StorageDead(_3);                 // scope 0 at $DIR/bool_compare.rs:13:17: 13:18
          switchInt(move _2) -> [false: bb2, otherwise: bb1]; // scope 0 at $DIR/bool_compare.rs:13:8: 13:18
      }
  
      bb1: {
          _0 = const 0_u32;                // scope 0 at $DIR/bool_compare.rs:13:21: 13:22
          goto -> bb3;                     // scope 0 at $DIR/bool_compare.rs:13:5: 13:35
      }
  
      bb2: {
          _0 = const 1_u32;                // scope 0 at $DIR/bool_compare.rs:13:32: 13:33
          goto -> bb3;                     // scope 0 at $DIR/bool_compare.rs:13:5: 13:35
      }
  
      bb3: {
          StorageDead(_2);                 // scope 0 at $DIR/bool_compare.rs:13:34: 13:35
          return;                          // scope 0 at $DIR/bool_compare.rs:14:2: 14:2
      }
  }