KFunc Interp With Vars
data class KFuncInterpWithVars<T : KSort>(val decl: KDecl<T>, val vars: List<KDecl<*>>, val entries: List<KFuncInterpEntry<T>>, val default: KExpr<T>?) : KFuncInterp<T>
Function interpretation, that contains variables in the body. For example, F(x) with default value (+ x 1).