code: def test_fuse_slices_with_alias(getter, getitem):
      dsk = {
          "x": np.arange(16).reshape((4, 4)),
          ("dx", 0, 0): (getter, "x", (slice(0, 4), slice(0, 4))),
          ("alias", 0, 0): ("dx", 0, 0),
          ("dx2", 0): (getitem, ("alias", 0, 0), (slice(None), 0)),
      }
      keys = [("dx2", 0)]
      dsk2 = optimize(dsk, keys)
      assert len(dsk2) == 3
      fused_key = (dsk2.keys() - {"x", ("dx2", 0)}).pop()
      assert _check_get_task_eq(
          dsk2[fused_key], (getter, "x", (slice(0, 4), 0))
      )
  
imports: from __future__ import annotations
  import pytest
  import numpy
  import dask
  import dask.array
  from dask.array.chunk import getitem
  from dask.array.core import getter
  from dask.array.core import getter_nofancy
  from dask.array.optimization import _is_getter_task, fuse_slice, optimize, optimize_blockwise, optimize_slices
  from dask.array.utils import assert_eq
  from dask.highlevelgraph import HighLevelGraph
  from dask.optimization import SubgraphCallable, fuse
  from dask.utils import SerializableLock
label_desc: Use image node_id 16 for calling a global function with example usage: test_fuse_slices_with_alias(getter, getitem) without return types