code: @Override
      public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible) {
          AnnotationVisitor av = super.visitParameterAnnotation(parameter, desc, visible);
          Set<Type> parameterAnnotations = observedParameterAnnotations.get(parameter);
          if (parameterAnnotations == null) {
              parameterAnnotations = new HashSet<Type>();
              observedParameterAnnotations.put(parameter, parameterAnnotations);
          }
          parameterAnnotations.add(Type.getType(desc));
          return av;
      }
docs: Visit the method parameter annotations looking for the supported RAS
  annotations. The visitors are only used when a {@code MethodInfo} model
  object was not provided during construction.
  
  @param desc
  the annotation descriptor
  @param visible
  true if the annotation is a runtime visible annotation