- // MIR for `foo` before MatchBranchSimplification
+ // MIR for `foo` after MatchBranchSimplification
  
  fn foo(_1: Option<()>) -> () {
      debug bar => _1;                     // in scope 0 at $DIR/matches_reduce_branches.rs:6:8: 6:11
      let mut _0: ();                      // return place in scope 0 at $DIR/matches_reduce_branches.rs:6:25: 6:25
      let mut _2: bool;                    // in scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
      let mut _3: isize;                   // in scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+     let mut _4: isize;                   // in scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
          _3 = discriminant(_1);           // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
-         switchInt(move _3) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+         StorageLive(_4);                 // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+         _4 = move _3;                    // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+         _2 = Eq(_4, const 0_isize);      // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+         StorageDead(_4);                 // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+         goto -> bb3;                     // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
      }
  
      bb1: {
          _2 = const false;                // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
          goto -> bb3;                     // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
      }
  
      bb2: {
          _2 = const true;                 // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
          goto -> bb3;                     // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
      }
  
      bb3: {
          switchInt(_2) -> [false: bb4, otherwise: bb5]; // scope 0 at $DIR/matches_reduce_branches.rs:7:5: 9:6
      }
  
      bb4: {
          _0 = const ();                   // scope 0 at $DIR/matches_reduce_branches.rs:9:6: 9:6
          goto -> bb5;                     // scope 0 at $DIR/matches_reduce_branches.rs:7:5: 9:6
      }
  
      bb5: {
          StorageDead(_2);                 // scope 0 at $DIR/matches_reduce_branches.rs:10:1: 10:2
          return;                          // scope 0 at $DIR/matches_reduce_branches.rs:10:2: 10:2
      }
  }