const bool has_attribute (T, string member, alias attribute) ()
{
  // ok
    mixin(
      `foreach (type; __traits (getAttributes, T.`~member~`))`
        `static if (is (type == attribute))`
          `return true;`
    );
  // ok
    foreach (type; mixin(`__traits (getAttributes, T.`~member~`)`))
      static if (is (type == attribute))
        return true;
  // doesn't compile, member is not accessible error
    foreach (type; __traits (getAttributes, mixin(`T.`~member)))
      static if (is (type == attribute))
        return true;
  return false;
}