fact: Definition size_of_maybe_empty_item {it} (p : maybe_empty_item G valid it) : nat := @size_of_maybe_empty_item' (@size_of_maybe_empty_productions) it p.
imports: Fiat.Parsers.ContextFreeGrammar.Core Fiat.Parsers.Reachable.MaybeEmpty.Core Fiat.Parsers.BaseTypes