fn missing_items_suggestions(
tcx: TyCtxt<'_>,
impl_def_id: LocalDefId,
missing_items: &[AssocItem],
) -> (String, Vec<MissingTraitItemSuggestion>, Vec<MissingTraitItemSuggestionNone>, Vec<MissingTraitItemSuggestionUnstable>, Vec<MissingTraitItemLabel>)