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

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pragma experimental SMTChecker;
contract C
{
function f(int8 x) public pure returns (int8) {
x = 127;
int8 y = x + 1;
assert(y == -128);
y = x + 127;
assert(y == -2);
x = -127;
y = x + -127;
assert(y == 2);
}
}
// ----
// Warning 6321: (87-91): Unnamed return variable can remain unassigned. Add an explicit return with value to all non-reverting code paths or name the variable.
// Warning 4984: (117-122): CHC: Overflow (resulting value larger than 127) happens here.
// Warning 4984: (151-158): CHC: Overflow (resulting value larger than 127) happens here.
// Warning 3944: (197-205): CHC: Underflow (resulting value less than -128) happens here.