anchor.diff:      }
   
       // Check all getters, and collect offenders along the way.
  -    List<MethodDeclaration> missingDocs = <MethodDeclaration>[];
  +    Set<MethodDeclaration> missingDocs = Set<MethodDeclaration>();
       for (MethodDeclaration getter in getters.values) {
         if (check(getter)) {
           missingDocs.add(getter);
  
positive.code:         if (member.isGetter) {
            getters[member.name.name] = member;
          } else if (member.isSetter) {
            setters[member.name.name] = member;
          } else {
            methods.add(member);
          }
  
negative.code:           if (member.isGetter) {
              getters[member.name.name] = member;
            } else if (member.isSetter) {
              setters.add(member);
            } else {
              functions.add(member);
            }
  