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Test.sol

pragma solidity ^0.4.11;

contract Test {
    Receiver myR;

    function setReceiver (address a) {
        myR = Receiver(a);
    }
    
    function callR() {
        myR.call(this.balance);
    }
    
    function sendCash() payable {
    }
    
}

contract Receiver {
    uint public numCalled;
    
    function () payable {
        numCalled++;
    }
}