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

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pragma experimental SMTChecker;
contract C
{
function f(int8 x) public pure returns (int8) {
x = -2;
int8 y = x - 127;
assert(y == 127);
x = -128;
y = x - 127;
assert(y == 1);
x = 127;
y = x - (-127);
assert(y == -2);
return y;
}
}
// ----
// Warning 4144: (116-123): Underflow (resulting value less than -128) happens here
// Warning 4144: (163-170): Underflow (resulting value less than -128) happens here
// Warning 2661: (207-217): Overflow (resulting value larger than 127) happens here