solidity/tools/solidityUpgrade/contracts/Test.sol

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pragma solidity >0.4.23;
contract Storage {
function Storage() public {}
function start();
function state() public view returns (bool);
function stop() public;
}
contract Observable {
function state() public view returns (bool);
}
contract VolatileStorage is Storage, Observable {
function start() {}
function state() public view returns (bool) {}
function stop() {}
}