nl_tokens: Construct a new instance .
pl_tokens: function ContractInstance ( config ) { _classCallCheck ( this , ContractInstance ) ; this . _config = config ; this . _contract = config . contract ; this . _web3 = this . _contract . _web3 ; this . _address = config . address ; this . _inst = this . contract . _contract . at ( this . _address ) ; /*
        Logger is same as parent contract one, except that address is prepended 
        to all log output.
         */ this . _logger = { } ; for ( var logMethod in DUMMY_LOGGER ) { this . _logger [ logMethod ] = function ( logMethod , self ) { return function ( ) { self . <mask> . logger [ logMethod ] . apply ( self . contract . logger , [ '[' + self . address + ']: ' ] . concat ( Array . from ( arguments ) ) ) ; } ; } ( logMethod , this ) ; } }