nl_tokens: Ganked from node https : // github . com / joyent / node / blob / v0 . 10 . 22 - release / lib / fs . js#L1015 - L1023
pl_tokens: function ErrnoError ( err , syscall , cause ) { this . cause = cause ; this . code = err ; this . message = syscall + ': ' + err + ( cause ? ': ' + cause . toString ( ) : '' ) ; this . name = 'ErrnoError' ; this . syscall = syscall ; <mask> . captureStackTrace ( this , ErrnoError ) ; }