Warning: BMC: Underflow (resulting value less than 0) happens here.
 --> model_checker_targets_underflow_bmc/input.sol:7:3:
  |
7 | 		--x;
  | 		^^^
Note: Counterexample:
  <result> = (- 1)
  a = 0
  x = 0

Note: Callstack:
Note: