fact: Definition lift_var (E': context) (t': type) {E: context} {t: type} (v: var (E' ++ E) t) : { w : var (E' ++ t' :: E) t | forall e, dvar w e = dvar v (unlift_env E' t' E e)}.
imports: Coq(Bool String List Program.Equality) CDF(Sequences)