contract AbstractToken {
    // This is not an abstract function, because solc won't recognize generated getter functions for public variables as functions
    function totalSupply() public constant returns (uint256) {}
    function balanceOf(address owner) public constant returns (uint256 balance);
    function transfer(address to, uint256 value) public returns (bool success);
    function transferFrom(address from, address to, uint256 value) public returns (bool success);
    function approve(address spender, uint256 value) public returns (bool success);
    function allowance(address owner, address spender) public constant returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Issuance(address indexed to, uint256 value);
}
function totalSupply() public constant returns (uint256) {}
// This is not an abstract function, because solc won't recognize generated getter functions for public variables as functions