pragma experimental SMTChecker;

contract C {
	function f(bytes memory data) public pure {
		bytes32 k = keccak256(data);
		fi(data, k);
	}
	function fi(bytes memory data, bytes32 k) internal pure {
		bytes32 h = sha256(data);
		assert(h == k);
	}
}
// ----
// Warning 6328: (229-243): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nC.constructor()\nC.f(data)\n    C.fi(data, 7719) -- internal call