fact: Definition pregrammar'_of_pregrammar {Char} (g : pregrammar Char) : pregrammar' Char.
imports: Coq.Strings.String Coq.Lists.List Fiat.Parsers.ContextFreeGrammar.Core Fiat.Parsers.ContextFreeGrammar.Reflective Fiat.Common.List.Operations Fiat.Common.Equality Fiat.Common.Gensym