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pragma experimental SMTChecker;

contract D
{
    function g(uint x) public;
}

contract C
{
    uint x;
    function f(uint y, D d) public {
        require(x == y);
        assert(x == y);
        d.g(y);
        // Storage knowledge is cleared after an external call.
        assert(x == y);
    }
}
// ----
// Warning: (119-122): Assertion checker does not yet support the type of this variable.
// Warning: (240-254): Assertion violation happens here