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

pragma experimental SMTChecker;

contract C
{
	function f(uint8 x) public pure returns (uint) {
		x = 0;
		uint8 y;
		unchecked { y = x - 1; }
		assert(y == 255);
		unchecked { y = x - 255; }
		assert(y == 1);
		return y;
	}
}
// ----
[SMTChecker] Only check for overflow/underflow in the end of the function 2019-02-06 10:12:02 +00:00			`pragma experimental SMTChecker;`

			`contract C`
			`{`
			`function f(uint8 x) public pure returns (uint) {`
			`x = 0;`
[SMTChecker] Support check/unchecked 2020-12-16 17:32:34 +00:00			`uint8 y;`
			`unchecked { y = x - 1; }`
[SMTChecker] Only check for overflow/underflow in the end of the function 2019-02-06 10:12:02 +00:00			`assert(y == 255);`
[SMTChecker] Support check/unchecked 2020-12-16 17:32:34 +00:00			`unchecked { y = x - 255; }`
[SMTChecker] Only check for overflow/underflow in the end of the function 2019-02-06 10:12:02 +00:00			`assert(y == 1);`
			`return y;`
			`}`
			`}`
			`// ----`