- // MIR for `mutate_discriminant` before JumpThreading
+ // MIR for `mutate_discriminant` after JumpThreading
  
  fn mutate_discriminant() -> u8 {
      let mut _0: u8;
      let mut _1: std::option::Option<NonZeroUsize>;
      let mut _2: (usize) is 1..;
      let mut _3: isize;
  
      bb0: {
          discriminant(_1) = 1;
          _2 = const 0_usize as (usize) is 1.. (Transmute);
          (((_1 as variant#1).0: NonZeroUsize).0: (usize) is 1..=usize::MAX) = copy _2;
          _3 = discriminant(_1);
          switchInt(copy _3) -> [0: bb1, otherwise: bb2];
      }
  
      bb1: {
          _0 = const 1_u8;
          return;
      }
  
      bb2: {
          _0 = const 2_u8;
          unreachable;
      }
  }