- // MIR for `main` before UnreachablePropagation
+ // MIR for `main` after UnreachablePropagation
  
  fn main() -> () {
      let mut _0: ();
      let _1: bool;
      let mut _2: std::option::Option<Empty>;
      let mut _3: isize;
      let _5: ();
      let mut _6: bool;
      let mut _7: !;
+     let mut _8: bool;
      scope 1 {
          debug x => _1;
          scope 2 {
              debug bomb => _4;
              let _4: Empty;
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = const true;
          StorageLive(_2);
          _2 = empty() -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
          _3 = discriminant(_2);
          switchInt(move _3) -> [1: bb2, otherwise: bb6];
      }
  
      bb2: {
          StorageLive(_4);
          _4 = move ((_2 as Some).0: Empty);
          StorageLive(_5);
          StorageLive(_6);
          _6 = copy _1;
-         switchInt(move _6) -> [0: bb4, otherwise: bb3];
+         _8 = Ne(copy _6, const false);
+         assume(move _8);
+         goto -> bb3;
      }
  
      bb3: {
          _5 = loop_forever() -> [return: bb5, unwind unreachable];
      }
  
      bb4: {
-         _5 = const ();
-         goto -> bb5;
+         unreachable;
      }
  
      bb5: {
-         StorageDead(_6);
-         StorageDead(_5);
-         StorageLive(_7);
          unreachable;
      }
  
      bb6: {
          _0 = const ();
          StorageDead(_1);
          StorageDead(_2);
          return;
      }
  }