Scope& Scope::operator=(const Scope& other) {
  // We can't copy Impls because of the const members, use copy ctor instead
  impl_.reset(new Impl(*other.impl_));
  return *this;
}

namespace {
const char kScopeSeparator[] = "/";
const char kSuffixSeparator[] = "_";
}  // namespace

Scope::Impl::Impl(Graph* graph, Status* status, NameMap* name_map,
                  ShapeRefiner* refiner, bool disable_shape_inference)