- // MIR for `foo` before MatchBranchSimplification
+ // MIR for `foo` after MatchBranchSimplification
  
  fn foo(_1: Option<()>) -> () {
      debug bar => _1;
      let mut _0: ();
      let mut _2: bool;
      let mut _3: isize;
+     let mut _4: isize;
      scope 1 {
      }
  
      bb0: {
          StorageLive(_2);
          _3 = discriminant(_1);
-         switchInt(move _3) -> [0: bb2, otherwise: bb1];
+         StorageLive(_4);
+         _4 = no_retag move _3;
+         _2 = Eq(copy _4, const 0_isize);
+         StorageDead(_4);
+         switchInt(move _2) -> [0: bb2, otherwise: bb1];
      }
  
      bb1: {
-         _2 = const false;
+         _0 = ();
          goto -> bb3;
      }
  
      bb2: {
-         _2 = const true;
+         _0 = const ();
          goto -> bb3;
      }
  
      bb3: {
-         switchInt(move _2) -> [0: bb5, otherwise: bb4];
-     }
- 
-     bb4: {
-         _0 = ();
-         goto -> bb6;
-     }
- 
-     bb5: {
-         _0 = const ();
-         goto -> bb6;
-     }
- 
-     bb6: {
          StorageDead(_2);
          return;
      }
  }