solidity/test/libsolidity/smtCheckerTests/invariants/state_machine_1.sol
2019-12-09 15:32:08 +01:00

35 lines
485 B
Solidity

pragma experimental SMTChecker;
contract C {
uint x;
function f() public {
if (x == 0)
x = 1;
}
function g() public {
if (x == 1)
x = 2;
}
function h() public {
if (x == 2)
x = 0;
}
// This function shows that (x < 9) is not inductive and
// a stronger invariant is needed to be found.
// (x < 3) is the one found in the end.
function j() public {
if (x == 7)
x = 100;
}
function i() public view {
assert(x < 9);
}
}
// ====
// SMTSolvers: z3