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

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pragma experimental SMTChecker;
contract C
{
function f(uint8 x) public pure returns (uint) {
x = 0;
uint8 y = x - 1;
assert(y == 255);
y = x - 255;
assert(y == 1);
return y;
}
}
// ----
// Warning 4144: (117-122): Underflow (resulting value less than 0) happens here
// Warning 4144: (150-157): Underflow (resulting value less than 0) happens here