- // MIR for `arithmetic_checked` before GVN
+ // MIR for `arithmetic_checked` after GVN
  
  fn arithmetic_checked(_1: u64) -> () {
      debug x => _1;
      let mut _0: ();
      let _2: ();
      let mut _3: u64;
      let mut _4: u64;
      let mut _5: (u64, bool);
      let _6: ();
      let mut _7: u64;
      let mut _8: u64;
      let mut _9: (u64, bool);
      let _10: ();
      let mut _11: u64;
      let mut _12: u64;
      let mut _13: u64;
      let mut _14: (u64, bool);
      let _15: ();
      let mut _16: u64;
      let mut _17: u64;
      let mut _18: (u64, bool);
      let _19: ();
      let mut _20: u64;
      let mut _21: u64;
      let mut _22: (u64, bool);
  
      bb0: {
          StorageLive(_2);
          StorageLive(_3);
          StorageLive(_4);
          _4 = copy _1;
-         _5 = AddWithOverflow(copy _4, const 0_u64);
-         assert(!move (_5.1: bool), "attempt to compute `{} + {}`, which would overflow", move _4, const 0_u64) -> [success: bb1, unwind continue];
+         _5 = AddWithOverflow(copy _1, const 0_u64);
+         assert(!const false, "attempt to compute `{} + {}`, which would overflow", copy _1, const 0_u64) -> [success: bb1, unwind continue];
      }
  
      bb1: {
-         _3 = move (_5.0: u64);
+         _3 = copy _1;
          StorageDead(_4);
-         _2 = opaque::<u64>(move _3) -> [return: bb2, unwind continue];
+         _2 = opaque::<u64>(copy _1) -> [return: bb2, unwind continue];
      }
  
      bb2: {
          StorageDead(_3);
          StorageDead(_2);
          StorageLive(_6);
          StorageLive(_7);
          StorageLive(_8);
          _8 = copy _1;
-         _9 = SubWithOverflow(copy _8, const 0_u64);
-         assert(!move (_9.1: bool), "attempt to compute `{} - {}`, which would overflow", move _8, const 0_u64) -> [success: bb3, unwind continue];
+         _9 = copy _5;
+         assert(!const false, "attempt to compute `{} - {}`, which would overflow", copy _1, const 0_u64) -> [success: bb3, unwind continue];
      }
  
      bb3: {
-         _7 = move (_9.0: u64);
+         _7 = copy _1;
          StorageDead(_8);
-         _6 = opaque::<u64>(move _7) -> [return: bb4, unwind continue];
+         _6 = opaque::<u64>(copy _1) -> [return: bb4, unwind continue];
      }
  
      bb4: {
          StorageDead(_7);
          StorageDead(_6);
          StorageLive(_10);
-         StorageLive(_11);
+         nop;
          StorageLive(_12);
          _12 = copy _1;
          StorageLive(_13);
          _13 = copy _1;
-         _14 = SubWithOverflow(copy _12, copy _13);
-         assert(!move (_14.1: bool), "attempt to compute `{} - {}`, which would overflow", move _12, move _13) -> [success: bb5, unwind continue];
+         _14 = const (0_u64, false);
+         assert(!const false, "attempt to compute `{} - {}`, which would overflow", copy _1, copy _1) -> [success: bb5, unwind continue];
      }
  
      bb5: {
-         _11 = move (_14.0: u64);
+         _11 = const 0_u64;
          StorageDead(_13);
          StorageDead(_12);
-         _10 = opaque::<u64>(move _11) -> [return: bb6, unwind continue];
+         _10 = opaque::<u64>(const 0_u64) -> [return: bb6, unwind continue];
      }
  
      bb6: {
-         StorageDead(_11);
+         nop;
          StorageDead(_10);
          StorageLive(_15);
          StorageLive(_16);
          StorageLive(_17);
          _17 = copy _1;
-         _18 = MulWithOverflow(copy _17, const 0_u64);
-         assert(!move (_18.1: bool), "attempt to compute `{} * {}`, which would overflow", move _17, const 0_u64) -> [success: bb7, unwind continue];
+         _18 = const (0_u64, false);
+         assert(!const false, "attempt to compute `{} * {}`, which would overflow", copy _1, const 0_u64) -> [success: bb7, unwind continue];
      }
  
      bb7: {
-         _16 = move (_18.0: u64);
+         _16 = const 0_u64;
          StorageDead(_17);
-         _15 = opaque::<u64>(move _16) -> [return: bb8, unwind continue];
+         _15 = opaque::<u64>(const 0_u64) -> [return: bb8, unwind continue];
      }
  
      bb8: {
          StorageDead(_16);
          StorageDead(_15);
          StorageLive(_19);
          StorageLive(_20);
          StorageLive(_21);
          _21 = copy _1;
-         _22 = MulWithOverflow(copy _21, const 1_u64);
-         assert(!move (_22.1: bool), "attempt to compute `{} * {}`, which would overflow", move _21, const 1_u64) -> [success: bb9, unwind continue];
+         _22 = copy _5;
+         assert(!const false, "attempt to compute `{} * {}`, which would overflow", copy _1, const 1_u64) -> [success: bb9, unwind continue];
      }
  
      bb9: {
-         _20 = move (_22.0: u64);
+         _20 = copy _1;
          StorageDead(_21);
-         _19 = opaque::<u64>(move _20) -> [return: bb10, unwind continue];
+         _19 = opaque::<u64>(copy _1) -> [return: bb10, unwind continue];
      }
  
      bb10: {
          StorageDead(_20);
          StorageDead(_19);
          _0 = const ();
          return;
      }
  }
+ 
+ ALLOC0 (size: 16, align: 8) { .. }