solidity/test/libsolidity/smtCheckerTests/overflow/unsigned_sub_overflow.sol

pragma experimental SMTChecker;

contract C  {
	function f(uint x, uint y) public pure returns (uint) {
		return x - y;
	}
}
// ----
// Warning 3944: (113-118): CHC: Underflow (resulting value less than 0) happens here.