inline Arena *get_scratch(Arena **conflicts, u64 count) {
  if (!g_thread_ctx.scratch_arenas[0]) {
    thread_ctx_init();
  }
  for (u64 i = 0; i < 2; i++) {
    bool has_conflict = false;
    for (u64 j = 0; j < count; j++) {
      if (g_thread_ctx.scratch_arenas[i] == conflicts[j]) {
        has_conflict = true;
        break;
      }
    }
    if (!has_conflict) {
      return g_thread_ctx.scratch_arenas[i];
    }
  }
  TRAP();
}