fact: Definition TupleIndex {heading} (I : @IndexedTuple heading) : nat := elementIndex I.
imports: Coq.Lists.List Coq.Strings.String Coq.Logic.FunctionalExtensionality Coq.Sets.Ensembles Fiat.Common.ilist2 Fiat.Common.StringBound Coq.Program.Program Fiat.QueryStructure.Specification.Representation.Heading Fiat.Common.Ensembles.IndexedEnsembles Fiat.QueryStructure.Specification.Representation.Notations