def missing_once
import cli@0.2.0.0/cli.bend as Cliimport Base
3988# A group's display the first time a need_one rule names it.
3989def missing_once(listed: Bool, items: List<&2, SpecItem>,
3990 fields: List<&2, Field>, name: String) -> List<&2, String>:
3991 match listed:
3992 case True{}: []
3993 case False{}: missing_group(items, fields, name)