code: public Member addMember(String memberName, FunctionCall functionCall) {
  		if (haveMember(memberName)) {
  			throw new FuzzerException(memberName + ": member already exists of variable '" + name + "'");
  		}
  		Member member = new Member(memberName, functionCall);
  		members.add(member);
  		return member;
  	}
docs: Add a fuzzy member to this variable.
  <p>
  @param memberName   member name
  @param functionCall the function call
  @return the member