code: def test_inline_doesnt_shrink_fast_functions_at_top():
      dsk = {"x": (inc, "y"), "y": 1}
      result = inline_functions(dsk, [], fast_functions={inc})
      assert result == dsk
  
imports: from __future__ import annotations
  import itertools
  import pickle
  from functools import partial
  import pytest
  import dask
  from dask.base import tokenize
  from dask.core import get_dependencies
  from dask.local import get_sync
  from dask.optimization import SubgraphCallable, cull, functions_of, fuse, fuse_linear, inline, inline_functions
  from dask.utils import apply, partial_by_order
  from dask.utils_test import add, inc
label_desc: Use image node_id 14 for calling a global function with example usage: test_inline_doesnt_shrink_fast_functions_at_top() without return types