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pragma experimental SMTChecker;

contract C
{
    function f(uint x) public payable {
        assert(blockhash(x) > 0);
        assert(blockhash(2) > 0);
        uint y = x;
        assert(blockhash(x) == blockhash(y));
    }
}
// ----
// Warning: (85-109): Assertion violation happens here
// Warning: (113-137): Assertion violation happens here