- // MIR for `foo` before MatchBranchSimplification
+ // MIR for `foo` after MatchBranchSimplification
  
  fn foo(_1: [u8; 16]) -> Option<[u8; 4]> {
      debug bytes => _1;                   // in scope 0 at $DIR/issue-75439.rs:7:12: 7:17
      let mut _0: std::option::Option<[u8; 4]>; // return place in scope 0 at $DIR/issue-75439.rs:7:32: 7:47
      let _2: [u32; 4];                    // in scope 0 at $DIR/issue-75439.rs:9:9: 9:15
      let mut _3: [u8; 16];                // in scope 0 at $DIR/issue-75439.rs:9:47: 9:52
      let mut _5: [u8; 4];                 // in scope 0 at $DIR/issue-75439.rs:12:14: 12:38
      let mut _6: u32;                     // in scope 0 at $DIR/issue-75439.rs:12:33: 12:35
      scope 1 {
          debug dwords => _2;              // in scope 1 at $DIR/issue-75439.rs:9:9: 9:15
          let _4: u32;                     // in scope 1 at $DIR/issue-75439.rs:11:27: 11:29
          scope 3 {
              debug ip => _4;              // in scope 3 at $DIR/issue-75439.rs:11:27: 11:29
              scope 4 {
              }
          }
      }
      scope 2 {
      }
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $DIR/issue-75439.rs:9:9: 9:15
          StorageLive(_3);                 // scope 2 at $DIR/issue-75439.rs:9:47: 9:52
          _3 = _1;                         // scope 2 at $DIR/issue-75439.rs:9:47: 9:52
          _2 = transmute::<[u8; 16], [u32; 4]>(move _3) -> bb1; // scope 2 at $DIR/issue-75439.rs:9:37: 9:53
                                           // mir::Constant
                                           // + span: $DIR/issue-75439.rs:9:37: 9:46
                                           // + literal: Const { ty: unsafe extern "rust-intrinsic" fn([u8; 16]) -> [u32; 4] {std::intrinsics::transmute::<[u8; 16], [u32; 4]>}, val: Value(Scalar(<ZST>)) }
      }
  
      bb1: {
          StorageDead(_3);                 // scope 2 at $DIR/issue-75439.rs:9:52: 9:53
          switchInt(_2[0 of 4]) -> [0_u32: bb2, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:11:13: 11:14
      }
  
      bb2: {
          switchInt(_2[1 of 4]) -> [0_u32: bb3, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:11:16: 11:17
      }
  
      bb3: {
          switchInt(_2[2 of 4]) -> [0_u32: bb6, 4294901760_u32: bb7, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:11:19: 11:20
      }
  
      bb4: {
          discriminant(_0) = 0;            // scope 1 at $DIR/issue-75439.rs:14:9: 14:13
          goto -> bb9;                     // scope 1 at $DIR/issue-75439.rs:11:5: 15:6
      }
  
      bb5: {
          StorageLive(_5);                 // scope 3 at $DIR/issue-75439.rs:12:14: 12:38
          StorageLive(_6);                 // scope 4 at $DIR/issue-75439.rs:12:33: 12:35
          _6 = _4;                         // scope 4 at $DIR/issue-75439.rs:12:33: 12:35
          _5 = transmute::<u32, [u8; 4]>(move _6) -> bb8; // scope 4 at $DIR/issue-75439.rs:12:23: 12:36
                                           // mir::Constant
                                           // + span: $DIR/issue-75439.rs:12:23: 12:32
                                           // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(u32) -> [u8; 4] {std::intrinsics::transmute::<u32, [u8; 4]>}, val: Value(Scalar(<ZST>)) }
      }
  
      bb6: {
          StorageLive(_4);                 // scope 1 at $DIR/issue-75439.rs:11:27: 11:29
          _4 = _2[3 of 4];                 // scope 1 at $DIR/issue-75439.rs:11:27: 11:29
          goto -> bb5;                     // scope 1 at $DIR/issue-75439.rs:11:5: 15:6
      }
  
      bb7: {
          StorageLive(_4);                 // scope 1 at $DIR/issue-75439.rs:11:27: 11:29
          _4 = _2[3 of 4];                 // scope 1 at $DIR/issue-75439.rs:11:27: 11:29
          goto -> bb5;                     // scope 1 at $DIR/issue-75439.rs:11:5: 15:6
      }
  
      bb8: {
          StorageDead(_6);                 // scope 4 at $DIR/issue-75439.rs:12:35: 12:36
          ((_0 as Some).0: [u8; 4]) = move _5; // scope 3 at $DIR/issue-75439.rs:12:9: 12:39
          discriminant(_0) = 1;            // scope 3 at $DIR/issue-75439.rs:12:9: 12:39
          StorageDead(_5);                 // scope 3 at $DIR/issue-75439.rs:12:38: 12:39
          StorageDead(_4);                 // scope 1 at $DIR/issue-75439.rs:13:5: 13:6
          goto -> bb9;                     // scope 1 at $DIR/issue-75439.rs:11:5: 15:6
      }
  
      bb9: {
          StorageDead(_2);                 // scope 0 at $DIR/issue-75439.rs:16:1: 16:2
          return;                          // scope 0 at $DIR/issue-75439.rs:16:2: 16:2
      }
  }