code: def inc(x):
      flag.append(x)
      return x + 1
  
file_path: dask/dask/tests/test_cache.py
imports: from __future__ import annotations
  from operator import add
  from time import sleep
  import pytest
  from dask.cache import Cache
  from dask.callbacks import Callback
  from dask.local import get_sync
  from dask.threaded import get
label_desc: Use image node_id 1 for calling a global function with example usage: inc(x) and returns: unknown