RngStream rngstream = jrngstream_to_native(env, jrngstream);
RngStream_DeleteStream(&rngstream);
(*env)->SetLongField(env, jrngstream, jrngstream_bind, (intptr_t)NULL);
RngStream rngstream = jrngstream_to_native(env, jrngstream);
RngStream_DeleteStream(&rngstream);
(*env)->SetLongField(env, jrngstream, jrngstream_bind, (intptr_t)NULL);