Stupid code trying to figure if the same tc is messing itself up

code.c

static void enter_single_user(MVMThreadContext *tc, MVMDecoder *decoder) {
    if (!MVM_trycas(&(decoder->body.in_use), 0, 1)) {
	  if (tc == decoder->body.tc)
            fprintf(stderr, "tc's are equal\n");
        MVM_panic(17, "Decoder may not be used concurrently. Aborting ...");
    }
    decoder->body.tc = tc;
}