- // MIR for `on_assert` before SsaRangePropagation
+ // MIR for `on_assert` after SsaRangePropagation
  
  fn on_assert(_1: usize, _2: &[u8]) -> u8 {
      debug i => _1;
      debug v => _2;
      let mut _0: u8;
      let _3: ();
      let mut _4: bool;
      let mut _5: usize;
      let mut _6: usize;
      let mut _7: &[u8];
      let mut _8: !;
      let _9: usize;
      let mut _10: usize;
      let mut _11: bool;
      scope 1 (inlined core::slice::<impl [u8]>::len) {
          scope 2 (inlined std::ptr::metadata::<[u8]>) {
          }
      }
  
      bb0: {
          StorageLive(_3);
          nop;
          StorageLive(_5);
          _5 = copy _1;
          nop;
          StorageLive(_7);
          _7 = &(*_2);
          _6 = PtrMetadata(copy _2);
          StorageDead(_7);
          _4 = Lt(copy _1, copy _6);
          switchInt(copy _4) -> [0: bb2, otherwise: bb1];
      }
  
      bb1: {
          nop;
          StorageDead(_5);
          _3 = const ();
          nop;
          StorageDead(_3);
          StorageLive(_9);
          _9 = copy _1;
          _10 = copy _6;
-         _11 = copy _4;
-         assert(copy _4, "index out of bounds: the length is {} but the index is {}", copy _6, copy _1) -> [success: bb3, unwind unreachable];
+         _11 = const true;
+         assert(const true, "index out of bounds: the length is {} but the index is {}", copy _6, copy _1) -> [success: bb3, unwind unreachable];
      }
  
      bb2: {
          nop;
          StorageDead(_5);
          StorageLive(_8);
          _8 = panic(const "assertion failed: i < v.len()") -> unwind unreachable;
      }
  
      bb3: {
          _0 = copy (*_2)[_1];
          StorageDead(_9);
          return;
      }
  }
  
  ALLOC0 (size: 29, align: 1) {
      0x00 │ 61 73 73 65 72 74 69 6f 6e 20 66 61 69 6c 65 64 │ assertion failed
      0x10 │ 3a 20 69 20 3c 20 76 2e 6c 65 6e 28 29          │ : i < v.len()
  }