code: public AnnotationTypeElementDoc[] elements() {
          List<AnnotationTypeElementDoc> elements = List.nil();
          for (Scope.Entry e = tsym.members().elems; e != null; e = e.sibling) {
              if (e.sym != null && e.sym.kind == Kinds.MTH) {
                  MethodSymbol s = (MethodSymbol)e.sym;
                  elements = elements.prepend(env.getAnnotationTypeElementDoc(s));
              }
          }
          return
              elements.toArray(new AnnotationTypeElementDoc[elements.length()]);
      }
docs: Returns the elements of this annotation type.
  Returns an empty array if there are none.
  Elements are always public, so no need to filter them.