code: def repl_list(sd):
      x = sd["x"]
      if isinstance(x, list):
          return x
      return (list, x)
  
file_path: lightning-flash/tests/core/serve/test_dag/test_rewrite.py
imports: import pytest
  from flash.core.serve.dag.rewrite import VAR, RewriteRule, RuleSet, Traverser, args, head
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 7 for calling a global function with example usage: repl_list(sd) and returns: list,  x, x