solidity/test/libsolidity/smtCheckerTests/external_calls/external_safe.sol

pragma experimental SMTChecker;

abstract contract D {
	function d() external virtual;
}

contract C {
	uint x;
	D d;
	function f() public {
		if (x < 10)
			++x;
	}
	function g() public {
		d.d();
		assert(x < 11);
	}
}
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