Cli.env_names: def of cli@0.2.0.0
Import: import cli@0.2.0.0/cli.bend as Cli
Lines 7781-7789 of cli@0.2.0.0/cli.bend: https://jend.leeeet.dev/read.txt?path=cli@0.2.0.0/cli.bend&start_line=7781&end_line=7789

import Base

# Each arg's env name in pre-order: an arg's own, then its subcommands'.
def env_names(items: List<&2, Item>) -> List<&2, String>:
  match items:
    case Nil{}: Nil{}
    case Arg{usage, help, attrs} <> tail:
      List.append(&2, String, find_envs(attrs), env_names(tail))
    case Sub{name, about, children} <> tail:
      List.append(&2, String, env_names(children), env_names(tail))
    case head <> tail: env_names(tail)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=cli@0.2.0.0/cli.bend&name=Item
  https://jend.leeeet.dev/definition.txt?path=cli@0.2.0.0/cli.bend&name=find_envs