code: func (c *ConsulConfig) Merge(o *ConsulConfig) *ConsulConfig {
  	if c == nil {
  		if o == nil {
  			return nil
  		}
  		return o.Copy()
  	}
  
  	if o == nil {
  		return c.Copy()
  	}
  
  	r := c.Copy()
  
  	if o.Address != nil {
  		r.Address = o.Address
  	}
  
  	if o.Auth != nil {
  		r.Auth = r.Auth.Merge(o.Auth)
  	}
  
  	if o.Retry != nil {
  		r.Retry = r.Retry.Merge(o.Retry)
  	}
  
  	if o.SSL != nil {
  		r.SSL = r.SSL.Merge(o.SSL)
  	}
  
  	if o.Token != nil {
  		r.Token = o.Token
  	}
  
  	if o.Transport != nil {
  		r.Transport = r.Transport.Merge(o.Transport)
  	}
  
  	return r
  }
docs: // Merge combines all values in this configuration with the values in the other
  // configuration, with values in the other configuration taking precedence.
  // Maps and slices are merged, most other values are overwritten. Complex
  // structs define their own merge functionality.