mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
19 lines
439 B
Solidity
19 lines
439 B
Solidity
pragma experimental SMTChecker;
|
|
|
|
contract C
|
|
{
|
|
function f(uint8 x) public pure returns (uint8) {
|
|
uint8 y;
|
|
unchecked { y = x + 255; }
|
|
require(y >= x);
|
|
x = 255;
|
|
unchecked { y = x + 1; }
|
|
assert(y == 0);
|
|
y = x + 255;
|
|
assert(y == 254);
|
|
return y;
|
|
}
|
|
}
|
|
// ----
|
|
// Warning 4984: (218-225): CHC: Overflow (resulting value larger than 255) happens here.\nCounterexample:\n\nx = 255\n = 0\n\nTransaction trace:\nconstructor()\nf(0)
|