code: def _maybe_render_doc(s, vars):
      m = re.match("{{(.+)}}", s)
      if not m:
          return s
      # pylint: disable=eval-used
      fn = eval(m.group(1).strip(), vars)
      return fn.__doc__
  
imports: import contextlib
  import functools
  import json
  import os
  import re
  import click
  from click import shell_completion
  import guild
  from guild import python_util
label_desc: Use image node_id 14 for calling a global function with example usage: _maybe_render_doc(s, vars) and returns: fn, s