code: func (lsel internalSelector) Matches(l Labels) bool {
  	for ix := range lsel {
  		if matches := lsel[ix].Matches(l); !matches {
  			return false
  		}
  	}
  	return true
  }
docs: // Matches for a internalSelector returns true if all
  // its Requirements match the input Labels. If any
  // Requirement does not match, false is returned.