code: public AnnotationDesc[] annotations() {
          AnnotationDesc res[] = new AnnotationDesc[sym.getRawAttributes().length()];
          int i = 0;
          for (Attribute.Compound a : sym.getRawAttributes()) {
              res[i++] = new AnnotationDescImpl(env, a);
          }
          return res;
      }
docs: Get the annotations of this parameter.
  Return an empty array if there are none.