mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
27 lines
669 B
Solidity
27 lines
669 B
Solidity
contract C {
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uint x;
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bool lock;
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modifier mutex {
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require(!lock);
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lock = true;
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_;
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lock = false;
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}
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function set(uint _x) mutex public {
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x = _x;
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}
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function f(address _a) public {
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uint y = x;
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_a.call("aaaaa");
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assert(y == x); // should fail
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}
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}
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// ====
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// SMTEngine: all
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// ----
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// Warning 9302: (212-228): Return value of low-level calls not used.
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// Warning 6328: (232-246): CHC: Assertion violation happens here.\nCounterexample:\nx = 1, lock = false\n_a = 0\ny = 0\n\nTransaction trace:\nC.constructor()\nState: x = 0, lock = false\nC.f(0)\n _a.call("aaaaa") -- untrusted external call, synthesized as:\n C.set(1) -- reentrant call
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