- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/simplify_match.rs:5:11: 5:11
      let mut _1: bool;                    // in scope 0 at $DIR/simplify_match.rs:6:11: 6:31
      let _2: bool;                        // in scope 0 at $DIR/simplify_match.rs:6:17: 6:18
      scope 1 {
          debug x => _2;                   // in scope 1 at $DIR/simplify_match.rs:6:17: 6:18
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/simplify_match.rs:6:11: 6:31
          StorageLive(_2);                 // scope 0 at $DIR/simplify_match.rs:6:17: 6:18
          _2 = const false;                // scope 0 at $DIR/simplify_match.rs:6:21: 6:26
-         _1 = _2;                         // scope 1 at $DIR/simplify_match.rs:6:28: 6:29
+         _1 = const false;                // scope 1 at $DIR/simplify_match.rs:6:28: 6:29
          StorageDead(_2);                 // scope 0 at $DIR/simplify_match.rs:6:30: 6:31
-         switchInt(_1) -> [false: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify_match.rs:6:5: 6:31
+         switchInt(const false) -> [false: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify_match.rs:6:5: 6:31
      }
  
      bb1: {
          nop;                             // scope 0 at $DIR/simplify_match.rs:8:18: 8:20
          goto -> bb3;                     // scope 0 at $DIR/simplify_match.rs:8:18: 8:20
      }
  
      bb2: {
          _0 = noop() -> bb3;              // scope 0 at $DIR/simplify_match.rs:7:17: 7:23
                                           // mir::Constant
                                           // + span: $DIR/simplify_match.rs:7:17: 7:21
                                           // + literal: Const { ty: fn() {noop}, val: Value(<ZST>) }
      }
  
      bb3: {
          StorageDead(_1);                 // scope 0 at $DIR/simplify_match.rs:10:1: 10:2
          return;                          // scope 0 at $DIR/simplify_match.rs:10:2: 10:2
      }
  }