code: def run_arg(fn):
      """### Specify a Run
  
      You may specify a run using a run ID, a run ID prefix, or a
      one-based index corresponding to a run returned by the `list`
      command.
  
      """
      click_util.append_params(
          fn,
          [
              click.Argument(
                  ("run",),
                  metavar="[RUN]",
                  required=False,
                  shell_complete=ac_run,
              )
          ],
      )
      return fn
  
imports: import logging
  import click
  from guild import click_util
  from .None import ac_support
label_desc: Use image node_id 15 for calling a global function with example usage: run_arg(fn) and returns: fn