- // MIR for `as_match` before UnreachablePropagation
+ // MIR for `as_match` after UnreachablePropagation
  
  fn as_match() -> () {
      let mut _0: ();
      let mut _1: std::option::Option<Empty>;
      let mut _2: isize;
      let _3: Empty;
      let mut _4: !;
+     let mut _5: bool;
      scope 1 {
          debug _x => _3;
      }
  
      bb0: {
          StorageLive(_1);
          _1 = empty() -> [return: bb1, unwind continue];
      }
  
      bb1: {
          _2 = discriminant(_1);
-         switchInt(move _2) -> [0: bb4, 1: bb3, otherwise: bb2];
+         _5 = Eq(_2, const 0_isize);
+         assume(move _5);
+         goto -> bb4;
      }
  
      bb2: {
          unreachable;
      }
  
      bb3: {
-         StorageLive(_3);
-         _3 = move ((_1 as Some).0: Empty);
-         StorageLive(_4);
          unreachable;
      }
  
      bb4: {
          _0 = const ();
          StorageDead(_1);
          return;
      }
  }