fact: Definition resSig := {| ConstructorIndex := resConstructorIndex; MethodIndex := resMethodIndex; ConstructorDom idx := ConstructorDom extSig (constructorMap idx); MethodDomCod idx := MethodDomCod extSig (methodMap idx) |}.
imports: Fiat.Common Fiat.Computation.Core Fiat.ADT.Core Coq.Sets.Ensembles