fact: Definition char_at_matches_interp {Char} {HSLM : StringLikeMin Char} {_ : interp_RCharExpr_data Char} n str P := char_at_matches n str (interp_RCharExpr P).
imports: Coq.Strings.Ascii Fiat.Parsers.ContextFreeGrammar.Core Fiat.Common.Equality