Data_Get_Struct   525 ext/digest/digest.c     Data_Get_Struct(obj, rb_digest_metadata_t, algo);
Data_Get_Struct  6965 ext/tk/tcltklib.c     Data_Get_Struct(callq, struct call_queue, q);
Data_Get_Struct  7452 ext/tk/tcltklib.c     Data_Get_Struct(evq, struct eval_queue, q);
Data_Get_Struct  8958 ext/tk/tcltklib.c     Data_Get_Struct(ivq, struct invoke_queue, q);