contract C {
	function f() public pure {
		int16 x = 1;
		assert(~x == 0);
		x = 0xff;
		assert(~x == 0);
		x = 0x0f;
		assert(~x == 0xf0);
		x = -1;
		assert(~x != 0);
		x = -2;
		assert(~x == 1);
	}
}
// ====
// SMTEngine: all
// ----
// Warning 6328: (58-73): CHC: Assertion violation happens here.
// Warning 6328: (89-104): CHC: Assertion violation happens here.
// Warning 6328: (120-138): CHC: Assertion violation happens here.
// Warning 6328: (152-167): CHC: Assertion violation happens here.
// Info 1391: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.