Comment by von_lohengramm

I'm sure some C++ lawyer can correct me, but isn't branching off of `m_ptr` (e.g. `CHECK()`ing the value) after `std::move(m_ptr)` technically Unspecified Behavior since `std::move(m_ptr)` leaves `m_ptr` as an Unspecified Value? It would be up to the compiler to define the behavior if they so pleased, but the C++ spec would not require such behavior to be defined at all.