2020-09-28 10:09:40 +00:00
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pragma experimental SMTChecker;
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contract C {
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function f() public pure {
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assert(mulmod(2**256 - 1, 2, 14) == 2);
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uint y = 0;
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uint x = mulmod(2**256 - 1, 10, y);
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assert(x == 1);
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}
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function g(uint x, uint y, uint k) public pure returns (uint) {
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return mulmod(x, y, k);
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}
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}
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// ----
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2020-12-02 17:40:48 +00:00
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// Warning 4281: (141-166): CHC: Division by zero happens here.\nCounterexample:\n\n\n\n\nTransaction trace:\nconstructor()\nf()
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// Warning 6328: (170-184): CHC: Assertion violation happens here.\nCounterexample:\n\n\n\n\nTransaction trace:\nconstructor()\nf()
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// Warning 4281: (263-278): CHC: Division by zero happens here.\nCounterexample:\n\nx = 0\ny = 0\nk = 0\n = 0\n\nTransaction trace:\nconstructor()\ng(0, 0, 0)
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