- // MIR for `array_bound_mut` before NormalizeArrayLen
+ // MIR for `array_bound_mut` after NormalizeArrayLen
  
  fn array_bound_mut(_1: usize, _2: &mut [u8; N]) -> u8 {
      debug index => _1;
      debug slice => _2;
      let mut _0: u8;
      let mut _3: bool;
      let mut _4: usize;
      let mut _5: usize;
      let mut _6: &[u8];
      let mut _7: &[u8; N];
      let _8: usize;
      let mut _9: usize;
      let mut _10: bool;
      let _11: usize;
      let mut _12: usize;
      let mut _13: bool;
  
      bb0: {
          StorageLive(_3);
          StorageLive(_4);
          _4 = _1;
          StorageLive(_5);
          StorageLive(_6);
          StorageLive(_7);
          _7 = &(*_2);
          _6 = move _7 as &[u8] (PointerCoercion(Unsize));
          StorageDead(_7);
-         _5 = Len((*_6));
+         _5 = const N;
          goto -> bb1;
      }
  
      bb1: {
          StorageDead(_6);
          _3 = Lt(move _4, move _5);
          switchInt(move _3) -> [0: bb4, otherwise: bb2];
      }
  
      bb2: {
          StorageDead(_5);
          StorageDead(_4);
          StorageLive(_8);
          _8 = _1;
          _9 = Len((*_2));
          _10 = Lt(_8, _9);
          assert(move _10, "index out of bounds: the length is {} but the index is {}", move _9, _8) -> [success: bb3, unwind continue];
      }
  
      bb3: {
          _0 = (*_2)[_8];
          StorageDead(_8);
          goto -> bb6;
      }
  
      bb4: {
          StorageDead(_5);
          StorageDead(_4);
          StorageLive(_11);
          _11 = const 0_usize;
          _12 = Len((*_2));
          _13 = Lt(_11, _12);
          assert(move _13, "index out of bounds: the length is {} but the index is {}", move _12, _11) -> [success: bb5, unwind continue];
      }
  
      bb5: {
          (*_2)[_11] = const 42_u8;
          StorageDead(_11);
          _0 = const 42_u8;
          goto -> bb6;
      }
  
      bb6: {
          StorageDead(_3);
          return;
      }
  }