- // MIR for `array_bound_mut` before InstCombine
+ // MIR for `array_bound_mut` after InstCombine
  
  fn array_bound_mut(_1: usize, _2: &mut [u8; N]) -> u8 {
      debug index => _1;                   // in scope 0 at $DIR/lower_array_len.rs:17:40: 17:45
      debug slice => _2;                   // in scope 0 at $DIR/lower_array_len.rs:17:54: 17:59
      let mut _0: u8;                      // return place in scope 0 at $DIR/lower_array_len.rs:17:78: 17:80
      let mut _3: bool;                    // in scope 0 at $DIR/lower_array_len.rs:18:8: 18:27
      let mut _4: usize;                   // in scope 0 at $DIR/lower_array_len.rs:18:8: 18:13
      let mut _5: usize;                   // in scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
      let mut _6: &[u8];                   // in scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
      let mut _7: &[u8; N];                // in scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
      let _8: usize;                       // in scope 0 at $DIR/lower_array_len.rs:19:15: 19:20
      let mut _9: usize;                   // in scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
      let mut _10: bool;                   // in scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
      let _11: usize;                      // in scope 0 at $DIR/lower_array_len.rs:21:15: 21:16
      let mut _12: usize;                  // in scope 0 at $DIR/lower_array_len.rs:21:9: 21:17
      let mut _13: bool;                   // in scope 0 at $DIR/lower_array_len.rs:21:9: 21:17
      let mut _14: &[u8; N];               // in scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
  
      bb0: {
          StorageLive(_3);                 // scope 0 at $DIR/lower_array_len.rs:18:8: 18:27
          StorageLive(_4);                 // scope 0 at $DIR/lower_array_len.rs:18:8: 18:13
          _4 = _1;                         // scope 0 at $DIR/lower_array_len.rs:18:8: 18:13
          StorageLive(_5);                 // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          StorageLive(_6);                 // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          StorageLive(_7);                 // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          _7 = &(*_2);                     // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          StorageLive(_14);                // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          _14 = _7;                        // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          _6 = move _7 as &[u8] (Pointer(Unsize)); // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          StorageDead(_7);                 // scope 0 at $DIR/lower_array_len.rs:18:20: 18:21
-         _5 = Len((*_14));                // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
+         _5 = const N;                    // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          StorageDead(_14);                // scope 0 at $DIR/lower_array_len.rs:18:16: 18:27
          StorageDead(_6);                 // scope 0 at $DIR/lower_array_len.rs:18:26: 18:27
          _3 = Lt(move _4, move _5);       // scope 0 at $DIR/lower_array_len.rs:18:8: 18:27
          StorageDead(_5);                 // scope 0 at $DIR/lower_array_len.rs:18:26: 18:27
          StorageDead(_4);                 // scope 0 at $DIR/lower_array_len.rs:18:26: 18:27
          switchInt(move _3) -> [false: bb3, otherwise: bb1]; // scope 0 at $DIR/lower_array_len.rs:18:8: 18:27
      }
  
      bb1: {
          StorageLive(_8);                 // scope 0 at $DIR/lower_array_len.rs:19:15: 19:20
          _8 = _1;                         // scope 0 at $DIR/lower_array_len.rs:19:15: 19:20
-         _9 = Len((*_2));                 // scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
+         _9 = const N;                    // scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
          _10 = Lt(_8, _9);                // scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
          assert(move _10, "index out of bounds: the length is {} but the index is {}", move _9, _8) -> bb2; // scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
      }
  
      bb2: {
          _0 = (*_2)[_8];                  // scope 0 at $DIR/lower_array_len.rs:19:9: 19:21
          StorageDead(_8);                 // scope 0 at $DIR/lower_array_len.rs:20:5: 20:6
          goto -> bb5;                     // scope 0 at $DIR/lower_array_len.rs:18:5: 24:6
      }
  
      bb3: {
          StorageLive(_11);                // scope 0 at $DIR/lower_array_len.rs:21:15: 21:16
          _11 = const 0_usize;             // scope 0 at $DIR/lower_array_len.rs:21:15: 21:16
-         _12 = Len((*_2));                // scope 0 at $DIR/lower_array_len.rs:21:9: 21:17
+         _12 = const N;                   // scope 0 at $DIR/lower_array_len.rs:21:9: 21:17
          _13 = Lt(_11, _12);              // scope 0 at $DIR/lower_array_len.rs:21:9: 21:17
          assert(move _13, "index out of bounds: the length is {} but the index is {}", move _12, _11) -> bb4; // scope 0 at $DIR/lower_array_len.rs:21:9: 21:17
      }
  
      bb4: {
          (*_2)[_11] = const 42_u8;        // scope 0 at $DIR/lower_array_len.rs:21:9: 21:22
          StorageDead(_11);                // scope 0 at $DIR/lower_array_len.rs:21:22: 21:23
          _0 = const 42_u8;                // scope 0 at $DIR/lower_array_len.rs:23:9: 23:11
          goto -> bb5;                     // scope 0 at $DIR/lower_array_len.rs:18:5: 24:6
      }
  
      bb5: {
          StorageDead(_3);                 // scope 0 at $DIR/lower_array_len.rs:24:5: 24:6
          return;                          // scope 0 at $DIR/lower_array_len.rs:25:2: 25:2
      }
  }
  
