code: def assert_isinstance(coll: DaskCollection, protocol: Any) -> None:
      assert isinstance(coll, protocol)
  
imports: from __future__ import annotations
  from collections.abc import Hashable, Mapping, Sequence
  from typing import Any
  import pytest
  import dask
  import dask.threaded
  from dask.base import DaskMethodsMixin, dont_optimize, tokenize
  from dask.context import globalmethod
  from dask.delayed import Delayed, delayed
  from dask.typing import DaskCollection, Graph, HLGDaskCollection, Key, NestedKeys, PostComputeCallable, PostPersistCallable
label_desc: Use image node_id 5 for calling a global function with example usage: assert_isinstance(coll, protocol) without return types