def placeholder
import cli@0.2.0.0/cli.bend as Cliimport Base
6336# The name in a usage's <>, or in an optional positional's [].
6337def placeholder(+usage: String) -> String:
6338 Bool.pick(String, String.contains(usage, "<"), between(usage, '<', '>'),
6339 between(usage, '[', ']'))