- // MIR for `foo` before MatchBranchSimplification
+ // MIR for `foo` after MatchBranchSimplification
  
  fn foo(_1: [u8; 16]) -> Option<[u8; 4]> {
      debug bytes => _1;
      let mut _0: std::option::Option<[u8; 4]>;
      let _2: [u32; 4];
      let mut _4: [u8; 4];
      scope 1 {
          debug dwords => _2;
          scope 2 {
              debug ip => _3;
              let _3: u32;
          }
      }
  
      bb0: {
          StorageLive(_2);
          _2 = copy _1 as [u32; 4] (Transmute);
          switchInt(copy _2[0 of 4]) -> [0: bb1, otherwise: bb4];
      }
  
      bb1: {
          switchInt(copy _2[1 of 4]) -> [0: bb2, otherwise: bb4];
      }
  
      bb2: {
          switchInt(copy _2[2 of 4]) -> [0: bb3, 4294901760: bb3, otherwise: bb4];
      }
  
      bb3: {
          _3 = copy _2[3 of 4];
          StorageLive(_4);
          _4 = copy _3 as [u8; 4] (Transmute);
          _0 = Option::<[u8; 4]>::Some(move _4);
          StorageDead(_4);
          goto -> bb5;
      }
  
      bb4: {
          _0 = Option::<[u8; 4]>::None;
          goto -> bb5;
      }
  
      bb5: {
          StorageDead(_2);
          return;
      }
  }