- // 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:+0:12: +0:17
      let mut _0: std::option::Option<[u8; 4]>; // return place in scope 0 at $DIR/issue_75439.rs:+0:32: +0:47
      let _2: [u32; 4];                    // in scope 0 at $DIR/issue_75439.rs:+2:9: +2:15
      let mut _3: [u8; 16];                // in scope 0 at $DIR/issue_75439.rs:+2:47: +2:52
      let mut _5: [u8; 4];                 // in scope 0 at $DIR/issue_75439.rs:+5:14: +5:38
      let mut _6: u32;                     // in scope 0 at $DIR/issue_75439.rs:+5:33: +5:35
      scope 1 {
          debug dwords => _2;              // in scope 1 at $DIR/issue_75439.rs:+2:9: +2:15
          scope 3 {
              debug ip => _4;              // in scope 3 at $DIR/issue_75439.rs:+4:27: +4:29
              let _4: u32;                 // in scope 3 at $DIR/issue_75439.rs:+4:27: +4:29
              scope 4 {
              }
          }
      }
      scope 2 {
      }
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $DIR/issue_75439.rs:+2:9: +2:15
          StorageLive(_3);                 // scope 2 at $DIR/issue_75439.rs:+2:47: +2:52
          _3 = _1;                         // scope 2 at $DIR/issue_75439.rs:+2:47: +2:52
          _2 = move _3 as [u32; 4] (Transmute); // scope 2 at $DIR/issue_75439.rs:+2:37: +2:53
          StorageDead(_3);                 // scope 2 at $DIR/issue_75439.rs:+2:52: +2:53
          switchInt(_2[0 of 4]) -> [0: bb1, otherwise: bb6]; // scope 3 at $DIR/issue_75439.rs:+4:12: +4:30
      }
  
      bb1: {
          switchInt(_2[1 of 4]) -> [0: bb2, otherwise: bb6]; // scope 3 at $DIR/issue_75439.rs:+4:12: +4:30
      }
  
      bb2: {
          switchInt(_2[2 of 4]) -> [0: bb4, 4294901760: bb5, otherwise: bb6]; // scope 3 at $DIR/issue_75439.rs:+4:12: +4:30
      }
  
      bb3: {
          StorageLive(_5);                 // scope 3 at $DIR/issue_75439.rs:+5:14: +5:38
          StorageLive(_6);                 // scope 4 at $DIR/issue_75439.rs:+5:33: +5:35
          _6 = _4;                         // scope 4 at $DIR/issue_75439.rs:+5:33: +5:35
          _5 = move _6 as [u8; 4] (Transmute); // scope 4 at $DIR/issue_75439.rs:+5:23: +5:36
          StorageDead(_6);                 // scope 4 at $DIR/issue_75439.rs:+5:35: +5:36
          _0 = Option::<[u8; 4]>::Some(move _5); // scope 3 at $DIR/issue_75439.rs:+5:9: +5:39
          StorageDead(_5);                 // scope 3 at $DIR/issue_75439.rs:+5:38: +5:39
          StorageDead(_4);                 // scope 1 at $DIR/issue_75439.rs:+6:5: +6:6
          goto -> bb7;                     // scope 1 at $DIR/issue_75439.rs:+4:5: +8:6
      }
  
      bb4: {
          StorageLive(_4);                 // scope 3 at $DIR/issue_75439.rs:+4:27: +4:29
          _4 = _2[3 of 4];                 // scope 3 at $DIR/issue_75439.rs:+4:27: +4:29
          goto -> bb3;                     // scope 3 at $DIR/issue_75439.rs:+4:12: +4:30
      }
  
      bb5: {
          StorageLive(_4);                 // scope 3 at $DIR/issue_75439.rs:+4:27: +4:29
          _4 = _2[3 of 4];                 // scope 3 at $DIR/issue_75439.rs:+4:27: +4:29
          goto -> bb3;                     // scope 3 at $DIR/issue_75439.rs:+4:12: +4:30
      }
  
      bb6: {
          _0 = Option::<[u8; 4]>::None;    // scope 1 at $DIR/issue_75439.rs:+7:9: +7:13
          goto -> bb7;                     // scope 1 at $DIR/issue_75439.rs:+4:5: +8:6
      }
  
      bb7: {
          StorageDead(_2);                 // scope 0 at $DIR/issue_75439.rs:+9:1: +9:2
          return;                          // scope 0 at $DIR/issue_75439.rs:+9:2: +9:2
      }
  }