contract BurnableToken is BasicToken {

      event Burn(address indexed burner, uint256 value);

      /**
       * @dev Burns a specific amount of tokens.
       * @param _value The amount of token to be burned.
       */
      function burn(uint256 _value) public {
        require(_value <= balances[msg.sender]);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        Burn(burner, _value);
        Transfer(burner, address(0), _value);
      }
    }
function burn(uint256 _value) public {
  require(_value <= balances[msg.sender]);
  // no need to require value <= totalSupply, since that would imply the
  // sender's balance is greater than the totalSupply, which *should* be an assertion failure

  address burner = msg.sender;
  balances[burner] = balances[burner].sub(_value);
  totalSupply_ = totalSupply_.sub(_value);
  Burn(burner, _value);
  Transfer(burner, address(0), _value);
}

/**
 * @dev Burns a specific amount of tokens.
 * @param _value The amount of token to be burned.
 */