message: Work around execution space warning on GCC 10.
  Fixes
  Bug
diff: @@ -152,7 +152,7 @@ struct stream_deleter final
  struct stream_conditional_deleter final
  {
  private:
  - bool const cond_;
  + bool cond_;
  public:
  __host__
  @@ -205,8 +205,13 @@ public:
  __thrust_exec_check_disable__
  unique_stream(unique_stream const&) = delete;
  +
  + // GCC 10 complains if this is defaulted. See NVIDIA/thrust#1269.
  __thrust_exec_check_disable__
  - unique_stream(unique_stream&&) = default;
  + __host__ unique_stream(unique_stream &&o) noexcept
  + : handle_(std::move(o.handle_))
  + {}
  +
  __thrust_exec_check_disable__
  unique_stream& operator=(unique_stream const&) = delete;
  __thrust_exec_check_disable__
  