protected function setPrevious($throwable)
    {
        if ($throwable) {
            $this->previous = static::fromPHPThrowable($this->config, $throwable);
        }

        return $this;
    }
protected function setPrevious($throwable)
    {
        if ($throwable) {
            $this->previous = static::fromPHPThrowable($this->config, $throwable);
        }

        return $this;
    }
protected function setPrevious ( $ throwable ) { if ( $ throwable ) { $ this -> previous = static :: fromPHPThrowable ( $ this -> config , $ throwable ) ; } return $ this ; }
Set the previous throwable.

@param \Throwable $throwable the previous throwable

@return $this
Set the previous throwable .