- // MIR for `if_let` before UnreachablePropagation
+ // MIR for `if_let` after UnreachablePropagation
  
  fn if_let() -> () {
      let mut _0: ();
      let mut _1: std::option::Option<Empty>;
      let mut _2: isize;
      let _5: ();
      let mut _6: bool;
      let mut _7: !;
+     let mut _8: bool;
      scope 1 {
          debug _x => _3;
          let _3: Empty;
          let mut _4: i32;
          scope 2 {
              debug _y => _4;
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = empty() -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
          _2 = discriminant(_1);
-         switchInt(move _2) -> [1: bb2, otherwise: bb6];
+         _8 = Ne(_2, const 1_isize);
+         assume(move _8);
+         goto -> bb6;
      }
  
      bb2: {
-         StorageLive(_3);
-         _3 = move ((_1 as Some).0: Empty);
-         StorageLive(_4);
-         StorageLive(_5);
-         StorageLive(_6);
-         _6 = const true;
-         switchInt(move _6) -> [0: bb4, otherwise: bb3];
+         unreachable;
      }
  
      bb3: {
-         _4 = const 21_i32;
-         _5 = const ();
-         goto -> bb5;
+         unreachable;
      }
  
      bb4: {
-         _4 = const 42_i32;
-         _5 = const ();
-         goto -> bb5;
+         unreachable;
      }
  
      bb5: {
-         StorageDead(_6);
-         StorageDead(_5);
-         StorageLive(_7);
          unreachable;
      }
  
      bb6: {
          _0 = const ();
          StorageDead(_1);
          return;
      }
  }