/// must be "". The scheme must never be `nullptr`.
///
/// Every plugin fills this in `TF_InitPlugin`, using the alocator passed as
/// argument to allocate memory. After `TF_InitPlugin` finishes, core
/// TensorFlow uses the information present in this to initialize filesystems
/// for the URI schemes that the plugin requests.
///
/// All pointers defined in this structure point to memory allocated by the DSO

// scope for now. I'm just mentioning this here as that transition will mean
// removal of the registration part from `Env` and adding it here instead: we
// will need tables to hold for each scheme the function tables that implement
// the needed functionality instead of the current `FileSystemRegistry` code in
// `core/platform/env.cc`.
class ModularFileSystem final : public FileSystem {
 public:
  ModularFileSystem(

#ifdef __cplusplus
} /* end extern "C" */
#endif

#ifdef __cplusplus
// A workaround to ease conversion to and from numpy objects and
// TFE_TensorHandle's.
//
// TODO(ashankar): Figure out an alternative scheme that precludes the need for
// these API-boundary breaking methods.
namespace tensorflow {
class Tensor;
}  // namespace tensorflow

TFE_TensorHandle* TFE_NewTensorHandle(const tensorflow::Tensor& t,